The high temperature of the corona – the top layer of the solar atmosphere – still remained a mystery to astrophysicists. The lower layers of the Sun – the chromosphere and photosphere – heated to a temperature of tens of thousands of degrees Kelvin. In the boundary layer between the photosphere and corona thickness of a few kilometers the temperature of hundreds of thousands and up to several million degrees.
One hypothesis is needed to heat energy is stored and released in the twisted magnetic flux tubes, which are woven, connected to each other and break up. These structures, which form the so-called "magnetic carpet" is very small, and so far there was no way to see them.
In July 2012, NASA and the Russian Lebedev Physical Institute (LPI) conducted a joint experiment Hi-C (High Resolution Coronal Imager), in which the ultraviolet telescope was launched on a suborbital rocket weather. Pictures with this telescope for the first time, scientists were able to see the sun parts of about 150 kilometers, while the best solar telescopes have a resolution of no more than 900 kilometers. After processing the image, they have evidence that this "magnetic carpet" really exists.
"We first saw the fine magnetic structure able to weave structures that can store and release energy. Moreover, the energy stored up in them which corresponds to the energy that is needed to heat the corona," – said the Sergey Bogachev, co-director of the experiment Hi- C by the LPI.