Filming on board orbiting solar observatory SDO (Solar Dynamics Observatory) have allowed scientists to detect waves in the Sun, very similar to those that love to ride in the world surfers, the press service of Space Flight Center of NASA Goddard.
Such waves, running so-called Kelvin-Helmholtz instability, which arises when the difference in the speeds of the two media, allow to dissipate excess energy. Their study will help better understand how the solar corona — the outer atmosphere, and allow it to start the puzzle — why corona is thousands of times hotter than it should be according to the calculations.
"The Crown is a thousand times hotter than the Sun's visible surface, but what heats it — is unclear. People believe that such waves can cause turbulence, which in turn causes heating, but now we have seen the first direct wave Kelvin-Helmholtz instability," — says expert in solar physics Ofman Leon (Leon Ofman) of Goddard.
He and his colleagues found "waves for surfers," the images captured by SDO in April 2010, and published their analysis in the June issue of the Astrophysical Journal Letters.
Kelvin-Helmholtz instability occurs when two fluids of different densities or two streams of different rates of flow next to each other. Instability leads to a rapid transformation of a small ripple in the huge waves.
Computer simulation confirmed that such waves do form on the sun. The resulting turbulence and friction heat the plasma and to increase the temperature of the corona.
Fountain of the Sun
Meanwhile SDO filmed on the Sun more impressive event — coronal ejection of plasma following the solar flare.
X-ray flash, fixed satellite GOES 15, occurred on Tuesday in 06.41 GMT (10.41 MSK) in the active region 1126, is already close to the western edge of the solar disk. According to the center space weather forecast of the National Oceanic and Atmospheric Administration of the USA (NOAA), an outbreak was awarded class M2.
Flare was accompanied by a powerful ejection of plasma — a cloud of charged particles, which generate magnetic storms on Earth. But this time, they will pass the Earth — the active region 1126 is already out of the "line of fire", so-called geoeffective meridian.
However, the flux of protons, which gave rise to the flash may be a threat to satellites, told RIA Novosti on the eve of the head of the center space weather forecasts of the Institute of Terrestrial Magnetism, Ionosphere and Radio Wave Propagation (IZMIRAN) Sergei Gaidash.
Filming on board orbiting solar observatory SDO (Solar Dynamics Observatory) allowed scientists to see the spectacular sight of the "explosion" in the Sun.
On the video show how the Sun formed a real fountain of plasma, which then fell back into the light.
Solar flares are divided according to the power of X-ray radiation from the sun into five classes, which are designated by letters of the alphabet: A, B, C, M and X. Minimum class A0.0 corresponds to radiation on the Earth's orbit in 10 nanowatts per square meter. In the transition to the next letter power increases tenfold.
The most powerful in the last few months there was a flash of the sun on the Sun March 10 — the event has been assigned a class X1.5, its capacity was only one-third less than the record outbreak of February 15, which had a score of X2.5.