4/1/2023 0 Comments Sun corona in day light![]() Another idea is that solar tornadoes, which are giant vertical spirals of plasma that interact with the Sun’s magnetic field, could also lead to high coronal temperatures. It’s possible that millions of nanoflares, which are tiny explosions happening at the solar surface, are creating the energy that heats up the corona. Researchers aren’t sure exactly why the corona is so hot. The corona is much hotter than the Sun's surface, about 1 million ☌ compared to 5,500 ☌ (9,940 ☏). Why is the Corona So Much Hotter Than the Surface of the Sun? The corona is wispy, white streamers of plasma (charged gas) that radiate out from the surface of the Sun. During a total solar eclipse, the corona briefly comes into view as the Moon blocks out the light from the solar surface. The surface of the Sun is far too bright to allow a glimpse of the much fainter solar atmosphere. Earth actually orbits within the atmosphere of a star! We Can’t Usually See the Corona The solar wind is really just an extension of the Sun's atmosphere that engulfs all of the planets. It extends many thousands of kilometers above the visible surface of the Sun, gradually transforming into the solar wind that flows outward through our solar system. ![]() The uppermost portion of the Sun's atmosphere is called the corona. The wisps of plasma are typically hidden by the brightness of the Sun’s surface. The latest findings were also published by the American Physical Society.The Sun’s corona is visible during a total solar eclipse. Parker will keep drawing ever closer to the sun and diving deeper in to the corona until its grand finale orbit in 2025. ![]() It made its 10th close approach last month. Preliminary data suggest Parker also dipped into the corona during its ninth close approach in August, but scientists said more analyses are needed. Future coronal excursions will help scientists better understand the origin of the solar wind, he said, and how it is heated and accelerated out into space. The corona appeared dustier than expected, according to Raouafi. But he noted that Parker was moving so fast it covered a vast distance during that time, tearing along at more than 62 miles (100 kilometers) per second. Now you might think five hours, that doesn’t sound big”, the University of Michigan’s Justin Kasper told reporters. “The first and most dramatic time we were below for about five hours. The spacecraft dipped in and out of the corona at least three times, each a smooth transition, according to scientists. ![]() Launched in 2018, Parker was 8m miles (13m km) from the center of the sun when it first crossed the jagged, uneven boundary between the solar atmosphere and outgoing solar wind. Nour Raouafi, a project scientist with Johns Hopkins University, described the news as “fascinatingly exciting”.īecause the sun lacks a solid surface, the corona is where the action is exploring this magnetically intense region up close can help scientists better understand solar outbursts that can interfere with life here on Earth. Scientists said it took a few months to get the data back and then several more months to confirm. The Parker solar probe actually flew through the corona in April during the spacecraft’s eighth close approach to the sun. ![]()
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