Bright points and ejections observed on the sun by the KORONAS-FOTON instrument TESIS |
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| Authors: | A S Ulyanov S A Bogachev S V Kuzin |
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| Institution: | (1) Research Center for Atomic Physics and Astrophysics, Faculty of Physics, University of Bucharest, Atomistilor 405, CP Mg-11, Magurele, 077125, Romania;(2) Faculty of Physics, University of Bucharest, Atomistilor 405, Magurele, 077125, Romania;(3) Institute of Geodynamics “Sabba S. Stefanescu”, Jean-Louis Calderon 19-21, Bucharest, 020032, Romania |
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| Abstract: | Five-second observations of the solar corona carried out in the FeIX 171 Å line by the KORONAS-FOTON instrument TESIS are used to study the dynamics of small-scale coronal structures emitting in and around coronal bright points. The small-scale structures of the lower corona display complex dynamics similar to those of magnetic loops located at higher levels of the solar corona. Numerous detected oscillating structures with sizes below 10 000 km display oscillation periods from 50 to 350 s. The period distributions of these structures are different for P < 150 s and P > 150 s, which implies that different oscillation modes are excited at different periods. The small-scale structures generate numerous flare-like events with energies 1024–1026 erg (nanoflares) and with a spatial density of one event per arcsecond or more observed over an area of 4 × 1011 km2. Nanoflares are not associated with coronal bright points, and almost uniformly cover the solar disk in the observation region. The ejections of solar material from the coronal bright points demonstrate velocities of 80–110 km/s. |
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