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Share the QR code < / P > < p > with wechat scanning code to friends and circle of friends < / P > < p > [text / observer network Li Li] "this is the first time in history that a spacecraft has touched the sun." NASA announced on December 14 that one of its spacecraft, the Parker solar probe, came into contact with the sun for the first time, At that time, the ambient temperature was about 2 million degrees Fahrenheit (about 930000 degrees Celsius). This milestone marked "a great leap in solar science". < / P > < p > < / P > < p > according to NASA's official website on December 15, in April 2021, during Parker's eighth flight over the sun, it was about 8.1 million miles above the solar surface (13.03 million kilometers) encountered specific magnetism and particles, marking the first time it crossed the Alvin critical surface and entered the solar atmosphere. < / P > < p > Why did it take several months to announce this news? NASA said that the Parker solar probe was immersed in the corona when it approached the sun for the eighth time in April and the ninth time in August. But it took scientists several months Only then did I get the data, and then it took several months to confirm that I really "touched the sun" < p > so far, researchers are not sure where Parker came into contact with the sun. However, according to the remote image of the corona, it is estimated that it is between 10 and 20 solar radii from the solar surface, About 4.3 million to 8.6 million miles (6.92 million km to 13.84 million km). < / P > < p > the first "touch" of American spacecraft in history sun Video source: NASA's official website < / P > < p > Parker was launched in 2018 to explore the mysteries of the sun and get closer to the sun than any previous spacecraft. Parker finally came into contact with the sun's corona three years after launch. NASA compared the progress of this operation with that of the lunar landing operation: "the Parker solar probe flew over the outermost layer of the solar atmosphere (Corona), just as landing on the moon let scientists understand how the moon was formed." < / P > < p > "the Parker solar probe 'touching the sun' is a commemorative moment of solar science and a really great feat." Thomas Zurbuchen, deputy director of the science mission Council at NASA headquarters in Washington, said excitedly. "This milestone not only provides us with more in-depth insights into the evolution of the sun and its impact on the solar system, but also tells us more about the rest of the stars in the universe." < / P > < p > "close contact" It is very dangerous. The detector will withstand plasma explosion after being bombarded by space dust. Parker has a state-of-the-art heat shield, which makes it not overheat < p > as Parker gets closer to the surface of the sun, it is making new discoveries that other spacecraft cannot see because of the distance, including the discovery from the interior of the solar wind that particle flows from the sun can affect our earth. The solar material with energy becomes the solar wind. When it passes through the solar system to the earth and beyond, the sun's magnetic field will drag < p > 2019, Parker found that the magnetic force in the solar wind has a zigzag structure (called "gyration") ）, the closer to the sun, the richer the magnetic force. But how and where they formed remains a mystery. NASA says it is now close enough to determine that the magnetic force originated on the surface of the sun. Technically speaking, the sun has no solid surface, but an overheated atmosphere composed of solar materials binds the sun through gravity and magnetism < p > as heat rises and pressure pushes material away from the sun, it will reach the limit of gravity and magnetic field. This point is called Alvin critical interface, which marks the end of the solar atmosphere and the beginning of the solar wind < p > pictures provided by NASA depict the Parker Solar Probe approaching the sun < p > according to the associated press on December 14, scientists told reporters about the spacecraft entering and leaving the corona, "Every time it's a smooth transition. The first and most dramatic time, our spacecraft stayed below for about five hours... Now you might think about five hours, which doesn't sound long," stressed Justin Kasper of the University of Michigan. Parker's moving speed is very fast, more than 62 miles per second (100 km) and traveled a very long distance (more than 1.8 million km) in five hours. < / P > < p > nour raouafi, a park project scientist at Johns Hopkins Applied Physics Laboratory, said that the future coronal journey will help scientists better understand the origin of the solar wind and how it is heated and accelerated into space. In addition, close exploration of this region with strong magnetic field can help scientists better understand the solar storms that may interfere with life on earth < p > according to the official website of NASA, Parker carried out the 10th operation close to the sun in November this year. As Parker penetrates about 6.5 million miles (10.46 million kilometers) into the sun's atmosphere, he will reach the pseudocurrent (a huge structure that rises from the sun's surface and can be seen from the earth during the solar eclipse). NASA said Parker will continue to hover close to the sun and dive deep into the corona, eventually reaching 3.83 million miles from the sun's surface (6.16 million km). < / P > < p > Parker's next solar flyover is planned to be carried out in January 2022. < / P > < p > this article is the exclusive manuscript of observer network and cannot be reproduced without authorization. < / P > < p >

2023-03-22 10:04:48