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Chinese Spy Balloon Over The US: An Aerospace Expert Explains How The Balloons Work And What They Can See

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A Chinese surveillance balloon in U.S. airspace before it was shot down by the U.S. military. Peter Zay/Anadolu Agency via Getty Images

The U.S. military shot down what U.S. officials called a Chinese surveillance balloon off the coast of South Carolina on Feb. 4, 2023. Officials said that the U.S. Navy planned to recover the debris, which is in shallow water.

The U.S. and Canada tracked the balloon as it crossed the Aleutian Islands, passed over Western Canada and entered U.S. airspace over Idaho. Officials of the U.S. Department of Defense confirmed on Feb. 2, 2023, that the military was tracking the balloon as it flew over the continental U.S. at an altitude of about 60,000 feet, including over Malmstrom Air Force Base in Montana. The base houses the 341st Missile Wing, which operates nuclear intercontinental ballistic missiles.

The next day, Chinese officials acknowledged that the balloon was theirs but denied it was intended for spying or meant to enter U.S. airspace. U.S. Secretary of State Antony Blinken said that the balloon’s incursion led him to cancel his trip to Beijing. He had been scheduled to meet with Chinese Foreign Minister Qin Gang on Feb. 5 and 6.

The Pentagon has reported that a second suspected Chinese balloon was seen over Latin America. On Feb. 4, officials told reporters that a third Chinese surveillance balloon was operating somewhere else in the world, and that the balloons are part of a Chinese military surveillance program.

Monitoring an adversary from a balloon dates back to 1794, when the French used a hot air balloon to track Austrian and Dutch troops in the Battle of Fleurus. We asked aerospace engineer Iain Boyd of the University of Colorado Boulder to explain how spy balloons work and why anyone would use one in the 21st century.

What is a spy balloon?

A spy balloon is literally a gas-filled balloon that is flying quite high in the sky, more or less where we fly commercial airplanes. It has some sophisticated cameras and imaging technology on it, and it’s pointing all of those instruments down at the ground. It’s collecting information through photography and other imaging of whatever is going on down on the ground below it.

A high-altitude Chinese balloon drifted over the U.S., entering over Montana and moving over the central portion of the country, causing the U.S. to send fighter jets into the air and triggering an angry response from the U.S. government.

Why would someone want to use a spy balloon instead of just using spy satellites?

Satellites are the preferred method of spying from overhead. Spy satellites are above us today, typically at one of two different types of orbit.

The first is called low Earth orbit, and, as the name suggests, those satellites are relatively close to the ground. But they’re still several hundred miles above us. For imaging and taking photographs, the closer you are to something, the more clearly you can see it, and this applies to spying as well. The satellites that are in low Earth orbit have the advantage that they’re closer to the Earth so they’re able to see things more clearly than satellites that are farther away.

The disadvantage these low Earth orbit satellites have is that they are continually moving around the Earth. It takes them about 90 minutes to do one orbit around the Earth. That turns out to be pretty fast in terms of taking clear photographs of what’s going on below.

The second type of satellite orbit is called geosynchronous orbit, and that’s much farther away. It has the disadvantage that it’s harder to see things clearly when you’re very, very far away. But they have the advantage of what we call persistence, allowing satellites to capture images continuously. In those orbits, you’re essentially overlooking the exact same piece of ground on the Earth’s surface all the time because the satellite moves in exactly the same way the earth rotates – it rotates at the exact same speed.

a black-and-white view from high above a seaport showing a submarine
A U.S. satellite photo showing a Soviet submarine in port in 1982.
National Reconnaissance Office

A balloon in some ways gets the best of those. These balloons are much, much closer to the ground than any of the satellites, so they can see even more clearly. And then, of course, balloons are moving, but they’re moving relatively slowly, so they also have a degree of persistence. However, spying is not usually done these days with balloons because they are a relatively easy target and are not completely controllable.

What types of surveillance are spy balloons capable of?

I don’t know what’s on this particular spy balloon, but it’s likely to be different kinds of cameras collecting different types of information.

These days, imaging is conducted across different regions of the electromagnetic spectrum. Humans see in a certain range of this spectrum, the visible spectrum. And so if you have a camera and you take a photograph of your dog, that’s a visible photograph. That’s one of the things spy aircraft do. They take regular photographs, although they have very good zoom capabilities to be able to magnify what they’re seeing quite a lot.

But you can also gather different kinds of information in other parts of the electromagnetic spectrum. Another fairly well-known one is infrared. If it’s nighttime, a camera operating in the visible part of the spectrum is not going to show you anything. It’s all going to be dark. But an infrared camera can pick up things from heat in the dark.

How do these balloons navigate?

Most of these balloons literally go where the wind blows. There can be a little bit of navigation, but there are certainly not people aboard them. They are at the mercy of whatever the weather is. They sometimes have guiding apparatus on them that change a balloon’s altitude to catch winds going in particular directions. According to reports, U.S. officials said the Chinese surveillance balloon had propellers to help steer it. If this is confirmed, it means that its operator would have much more control over the path of the balloon.

What are the limits to a nation’s airspace? At what altitude does it become space and anybody’s right to be there?

There is an internationally accepted boundary called the Kármán Line at 62 miles (100 kilometers) altitude. This balloon is well below that, so it is absolutely, definitely in U.S. airspace.

Which countries are known to be using spy balloons?

The Pentagon has had programs over the last few decades studying what can be done with balloons that couldn’t be done in the past. Maybe they’re bigger, maybe they can go higher in the atmosphere so they’re more difficult to shoot down or disable. Maybe they could be more persistent.

The broad interest in this incident illustrates its unusual nature. Few people would expect any country to be actively using spy balloons these days.

The U.S. flew many balloons over the Soviet Union in the 1940s and 1950s, and those were eventually replaced by the high-altitude spy airplanes, the U-2s, and they were subsequently replaced by satellites.

a black and white photograph of a group of men holding ropes attached to a large balloon being inflated from the back of a truck in a desert
Project Moby Dick was an early Cold War-era effort by the U.S. to monitor the Soviet Union using high-altitude balloons.
United States Air Force Public Affairs

I’m sure a number of countries around the world have periodically gone back to reevaluate: Are there other things we could do now with balloons that we couldn’t do before? Do they close some gaps we have from satellites and airplanes?

What does that say about the nature of this balloon, which China confirmed is theirs?

China has complained for many years about the U.S. spying on China through satellites, through ships. And China is also well known for engaging in somewhat provocative behavior, like in the South China Sea, sailing close to other nations’ boundaries and saber-rattling. I think it falls into that category.

The balloon doesn’t pose any real threat to the U.S. I think sometimes China is just experimenting to see how far they can push things. This isn’t really very advanced technology. It’s not serving any real military purpose. I think it’s much more likely some kind of political message.

This article has been updated to include news that the balloon has been shot down by the U.S. military.

The Conversation

Iain Boyd receives funding from the U.S. Department of Defense, the U.S. Department of Energy, NASA, and Lockheed-Martin.

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TikTok Fears Point To Larger Problem: Poor Media Literacy In The Social Media Age

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Tiktok is not the only social media app to pose the threats it’s been accused of. picture alliance via Getty Images

The U.S. government moved closer to banning the video social media app TikTok after the House of Representatives attached the measure to an emergency spending bill on Apr. 17, 2024. The move could improve the bill’s chances in the Senate, and President Joe Biden has indicated that he will sign the bill if it reaches his desk.

The bill would force ByteDance, the Chinese company that owns TikTok, to either sell its American holdings to a U.S. company or face a ban in the country. The company has said it will fight any effort to force a sale.

The proposed legislation was motivated by a set of national security concerns. For one, ByteDance can be required to assist the Chinese Communist Party in gathering intelligence, according to the Chinese National Intelligence Law. In other words, the data TikTok collects can, in theory, be used by the Chinese government.

Furthermore, TikTok’s popularity in the United States, and the fact that many young people get their news from the platform – one-third of Americans under the age of 30 – turns it into a potent instrument for Chinese political influence.

Indeed, the U.S. Office of the Director of National Intelligence recently claimed that TikTok accounts run by a Chinese propaganda arm of the government targeted candidates from both political parties during the U.S. midterm election cycle in 2022, and the Chinese Communist Party might attempt to influence the U.S. elections in 2024 in order to sideline critics of China and magnify U.S. social divisions.

To these worries, proponents of the legislation have appended two more arguments: It’s only right to curtail TikTok because China bans most U.S.-based social media networks from operating there, and there would be nothing new in such a ban, since the U.S. already restricts the foreign ownership of important media networks.

Some of these arguments are stronger than others.

China doesn’t need TikTok to collect data about Americans. The Chinese government can buy all the data it wants from data brokers because the U.S. has no federal data privacy laws to speak of. The fact that China, a country that Americans criticize for its authoritarian practices, bans social media platforms is hardly a reason for the U.S. to do the same.

The debate about banning TikTok tends to miss the larger picture of social media literacy.

I believe the cumulative force of these claims is substantial and the legislation, on balance, is plausible. But banning the app is also a red herring.

In the past few years, my colleagues and I at UMass Boston’s Applied Ethics Center have been studying the impact of AI systems on how people understand themselves. Here’s why I think the recent move against TikTok misses the larger point: Americans’ sources of information have declined in quality and the problem goes beyond any one social media platform.

The deeper problem

Perhaps the most compelling argument for banning TikTok is that the app’s ubiquity and the fact that so many young Americans get their news from it turns it into an effective tool for political influence. But the proposed solution of switching to American ownership of the app ignores an even more fundamental threat.

The deeper problem is not that the Chinese government can easily manipulate content on the app. It is, rather, that people think it is OK to get their news from social media in the first place. In other words, the real national security vulnerability is that people have acquiesced to informing themselves through social media.

Social media is not made to inform people. It is designed to capture consumer attention for the sake of advertisers. With slight variations, that’s the business model of all platforms. That’s why a lot of the content people encounter on social media is violent, divisive and disturbing. Controversial posts that generate strong feelings literally capture users’ notice, hold their gaze for longer, and provide advertisers with improved opportunities to monetize engagement.

There’s an important difference between actively consuming serious, well-vetted information and being manipulated to spend as much time as possible on a platform. The former is the lifeblood of democratic citizenship because being a citizen who participates in political decision-making requires having reliable information on the issues of the day. The latter amounts to letting your attention get hijacked for someone else’s financial gain.

If TikTok is banned, many of its users are likely to migrate to Instagram and YouTube. This would benefit Meta and Google, their parent companies, but it wouldn’t benefit national security. People would still be exposed to as much junk news as before, and experience shows that these social media platforms could be vulnerable to manipulation as well. After all, the Russians primarily used Facebook and Twitter to meddle in the 2016 election.

Media literacy is especially critical in the age of social media.

Media and technology literacy

That Americans have settled on getting their information from outlets that are uninterested in informing them undermines the very requirement of serious political participation, namely educated decision-making. This problem is not going to be solved by restricting access to foreign apps.

Research suggests that it will only be alleviated by inculcating media and technology literacy habits from an early age. This involves teaching young people how social media companies make money, how algorithms shape what they see on their phones, and how different types of content affect them psychologically.

My colleagues and I have just launched a pilot program to boost digital media literacy with the Boston Mayor’s Youth Council. We are talking to Boston’s youth leaders about how the technologies they use everyday undermine their privacy, about the role of algorithms in shaping everything from their taste in music to their political sympathies, and about how generative AI is going to influence their ability to think and write clearly and even who they count as friends.

We are planning to present them with evidence about the adverse effects of excessive social media use on their mental health. We are going to talk to them about taking time away from their phones and developing a healthy skepticism towards what they see on social media.

Protecting people’s capacity for critical thinking is a challenge that calls for bipartisan attention. Some of these measures to boost media and technology literacy might not be popular among tech users and tech companies. But I believe they are necessary for raising thoughtful citizens rather than passive social media consumers who have surrendered their attention to commercial and political actors who do not have their interests at heart.

The Conversation

The Applied Ethics Center at UMass Boston receives funding from the Institute for Ethics and Emerging Technologies. Nir Eisikovits serves as the data ethics advisor to Hour25AI, a startup dedicated to reducing digital distractions.

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How Trump Is Using Courtroom Machinations To His Political Advantage

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Former President Donald Trump sits in a New York courtroom as jury selection proceeds in one of his criminal cases. Jabin Botsford/Pool Photo via AP

The second week is wrapping up in former President Donald Trump’s first criminal trial on charges from the state of New York related to paying hush money to an adult film star. So far, the jury has been selected, but no other proceedings have begun.

The Conversation U.S. interviewed Tim Bakken, a former New York prosecutor and now a legal scholar teaching at West Point, and Karrin Vasby Anderson, a political communication expert at Colorado State University, to find out what overarching themes they have observed, both in the courtroom and outside it.

Is this trial proceeding normally?

Bakken: It seems like an ordinary trial, but it is an extraordinary trial underneath if we really look at some of the details. The first thing that struck me was on Day 1, when Judge Juan Merchan questioned 96 jurors. Fifty of them said they could not be fair to Trump. On Day 3, 48 of that day’s 96 said the same thing.

That does not bode well for a defendant in a jurisdiction where Democrats outnumber Republicans 9 to 1.

In addition, the judge did not make an accommodation to alleviate the possible difficulty that such antagonism represents. If 50 out of 96 people raised their hands and said they couldn’t be fair because of the color of the defendant’s skin, that would signal a problem. In a trial, that problem is addressed through allowing the defense to ask more questions of the jurors and to get more peremptory challenges, which allows them to dismiss a juror without having to explain why.

There are 10 already allotted because this is a low-level felony trial. In other cases in New York, you would have 20, such as a murder case. And the judge has the discretion to increase that number. He could have done that in this case, but he didn’t.

An artist's rendering of a courtroom scene.
A courtroom sketch depicts Judge Juan Merchan, Donald Trump, prospective jurors and other court and legal personnel.
Christine Cornell via AP Pool

How fast is the judge moving?

Bakken: Merchan has told Trump he may not be able to attend his child’s high school graduation, scheduled for May 17. That indicates that the judge is moving apace.

But in many cases in New York – on Fridays, for example, when a defendant or defense lawyer or prosecutor is Muslim or Jewish – some or all of the entire day will be taken off by the judge. There won’t be any trial.

I think the judge will let Trump attend the high school graduation, because otherwise he might seem to treat Trump a little bit differently than other defendants.

What is most important for the public to understand so far?

Anderson: I think it’s important for the casual observer, who might wonder whether being on trial for a felony was hurting Trump’s presidential campaign, to understand that he’s strategically using the trial to his advantage.

Voters following the trial in the mainstream media are hearing from experts that the legal proceedings are progressing relatively normally and the system is standing up under the unprecedented circumstances of this case.

But in the conservative media sphere, Trump is using the trial as a campaign strategy pretty effectively, stoking his base’s fears and quoting pundits and hosts from Fox News, Newsmax and OAN who echo his framing of the trial.

Trump has said the requirement to be in the courtroom every day is harming his ability to campaign. The Guardian reported, however, that while he is in court, his “Truth Social page is putting up new posts minute by minute.”

If you look at those posts, you see a series of complaints about the case interspersed with pro-Trump campaign messaging and posts telling voters to be afraid of what he says is rampant crime under Joe Biden’s tenure as president.

Individually, the campaign posts are consistent with Trump’s usual messaging. But when Trump layers messages about crime with others about an allegedly corrupt justice system, the goal is to not only intensify voters’ fears but also tell voters they should be afraid because powerful people are coming for him and are going to come after regular people next.

Trump is also charging that the process of his trial is undermining democracy. He posted a video in which his close adviser Stephen Miller urged, “So when you hear them say that democracy is on trial, they’re right. Democracy is on trial. Freedom is on trial. The rule of law is on trial. … If Donald Trump is convicted then all of these principles are convicted and destroyed with him.”

This sets up a catch-22. If Trump is not convicted, he gets to say he was exonerated. If he is convicted, then he just pivots to this charge that a normally operating courtroom is what’s undermining justice and democracy – not his actions or the actions of his campaign.

If Trump was just posting on his social media account, it wouldn’t be nearly as powerful. But Fox News, OAN and Newsmax are really functioning as his campaign surrogates. Since much of the country is paying attention to that media space, that’s a really consequential campaign strategy. It’s savvy of him to use the court proceedings in this way.

A man walks out a door that is guarded by a police officer.
Donald Trump walks outside during a break in trial proceedings.
Mark Peterson/Pool Photo via AP

Is any of what Trump is saying a fair criticism or statement?

Bakken: The New York district attorney decided to prosecute Trump in this case. He didn’t have to. It seems unquestionable that Trump filed or made false business documents. That’s a misdemeanor. And in this instance, the misdemeanor statute of limitations had run out by the time the district attorney issued the charges. But the prosecutor chose to say the actions were related to another crime, which makes them felonies.

Anderson: The charges also have context. Maybe no other businessperson would be prosecuted for this filing of paperwork. But that’s only half of the problem. Donald Trump would not be in trouble for filing this paperwork if he hadn’t done it to allegedly illegally influence an election.

I think that’s actually why Trump is so aggressively pushing his narrative of “election interference.” He knows that the charges against him are really about breaking campaign finance laws and his conduct in an election more than a particular business filing.

Bakken: In the last week or so, it came out that Merchan had contributed to Democratic candidates, including President Biden, in the past. It was reportedly a total of US$35, which seems very minimal. But one of New York’s legal ethics leaders, Stephen Gillers, a professor at New York University, said it is a judicial ethics violation, though he said it would likely only merit a warning and not removal from the case.

What does the trial mean so far in terms of politics or the 2024 presidential election?

Anderson: I think the media has to report on the facts on all sides of this trial. But I worry that it may not actually be as consequential as maybe people who are following it think that it will be, because many undecided voters have opted out of political news altogether.

Bakken: The trial emphasizes an extraordinary level of political antagonism between the parties, and also an extraordinary reluctance of people who are not inclined toward party politics to tune out and protect themselves.

The people who are tuning out might not be strong advocates, politically, for one side or the other but the people who would be neutral if they collected all the information. They could be the moderators, the good-faith, middle-minded people who can help bridge the gap between the political combatants.

The Conversation

The authors do not work for, consult, own shares in or receive funding from any company or organization that would benefit from this article, and have disclosed no relevant affiliations beyond their academic appointment.

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South Korean President Yoon Faces Foreign Policy Challenges After The National Assembly Election

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South Korea’s pesident faces political woes. Kim Hong-Ji/AFP via Getty Images

South Korea’s parliamentary election of April 10, 2024, was widely seen as a referendum on President Yoon Suk Yeol’s first two years in office.

That being the case, the nation collectively expressed its strong disapproval.

With a relatively high turnout of 67%, voters handed Yoon’s conservative People’s Power Party defeat, with its share of the 300-seat National Assembly dropping from 114 to 108.

The opposition Democratic Party retained its large majority in the National Assembly, winning 175 seats and maintaining control in the populous metropolitan areas of Seoul, Incheon and Gyeonggi provinces. Voters also delivered a disappointing outcome for most third-party candidates, the exceptions being the Rebuilding Korea Party, which campaigned as more combative opposition to the DP, and the New Reform Party, which broke away from the ruling PPP earlier this year.

As a political scientist with a focus on East Asia and international affairs, I believe the election results will have ramifications on Yoon’s foreign and domestic agenda during the remainder of his term.

Growing domestic pressure

Yoon had hoped the election would end the political gridlock that has stymied his first two years as president.

Throughout that time, the opposition has held a legislative majority. Subsequently, Yoon’s government has seen key parts of its agenda for education, labor and pension reforms blocked. Yoon has also vetoed multiple bills passed by the opposition-controlled legislature.

But the election saw the DP and other opposition parties amass 192 seats, just short of a veto-proof, two-thirds majority. As such, President Yoon again faces a divided government for the remainder of his term. In fact, he will be the only South Korean president whose party has failed to control the National Assembly at any time during the five-year presidential term.

A better parliamentary outcome for Yoon’s party would have bolstered the chances for the government’s legislative agenda on pressing domestic issues, such as addressing the country’s declining birthrate, high inflation and expanding medical student enrollment, as well as relaxing business regulations.

Instead, the Yoon government is more likely to be on the defensive after the election. Opposition parties have vowed to investigate alleged stock manipulation involving first lady Kim Keon Hee and probe former Defense Minister Lee Jong-sup over claims that he influenced an earlier report into the drowning death of a Korean marine.

Though Yoon retains veto power, there is now growing uncertainty over whether ruling PPP assembly members will continue defending the president’s actions if and when the two probes move forward.

Meanwhile, President Yoon’s prime minister, Han Duck-soo, announced his resignation after the assembly election. The National Assembly can vote against the president’s nominee to replace him, which may compel Yoon to pick a candidate acceptable to the opposition parties.

A trickier foreign policy climate

Under South Korea’s political system, the presidency has greater leeway in national security and foreign affairs than in domestic policy.

As such, the Yoon government will likely continue its foreign policy of expanding trilateral partnerships with the U.S. and Japan, building ties with NATO and striving to be a “global pivotal” state in the Asia-Pacific region.

During his first two years in power, Yoon has generally aligned South Korea closer to the West, though he has also been careful to avoid direct confrontation with China and Russia – both of which are geographic neighbors and trade partners.

While the opposition-controlled National Assembly has, to date, been generally supportive of the Yoon government’s attempts to strengthen ties with the U.S. – a policy that remains popular among the South Korean public – the same cannot be said about its attempts to bolster relations with Japan.

In particular, the Democratic Party and the Rebuilding Korea Party have criticized the prospect of a closer partnership with Japan – whether through military exercises or intelligence sharing – mainly due to Korea’s experiences under Japanese colonial rule.

And despite being generally welcoming of ties with the West, the two opposition parties are more cautious than the Yoon government when it comes to engaging in geopolitical rivalry. Specifically, Democratic Party leader Lee Jae-myung warned during the recent election campaign that South Korea should not become involved in the Russia-Ukraine war or China-Taiwan tensions.

The opposition might not directly stop Yoon from pursuing his foreign policy, but they are likely to pressure the president to pay attention to domestic political issues.

Moreover, opposition parties will be pushing the Yoon government to demonstrate what diplomatic “wins” the country has secured through its partnership with Japan and the United States. Notably, if the point of strategic partnership with the United States and Japan is to ensure security in East Asia, some voters may legitimately ask why it has failed to deter North Korea’s continued military provocations.

If the Yoon government cannot demonstrate diplomatic successes, opposition parties are likely to frame his foreign policy as one-sided “subservient diplomacy.”

Yoon has three years to show that his foreign policy has paid dividends; South Korea’s next presidential election is in the spring of 2027.

How successfully the president can navigate the domestic and international constraints exacerbated by the results of the parliamentary election could determine whether he exceeds the political expectations of a president facing a divided government or encounter, as some predict, an early “lame-duck presidency.”

The Conversation

Jong Eun Lee does not work for, consult, own shares in or receive funding from any company or organization that would benefit from this article, and has disclosed no relevant affiliations beyond their academic appointment.

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