Scientific achievements. Solar system

2012

Discovery of the generation of high-energy electrons in a weak flare

Sub-second pulses were recorded for the first time at RATAN-600 with a temporal resolution of 7 ms in the range from 3.5 to 8 GHz, which is confirmed by independent observations on the Siberian Solar spectropolarimeter in the 4-8 GHz range. These pulses emerge in the impulsive phase of the flare and are superimposed on the flares of longer duration. A comparison of the temporal profiles and spectra for the microwave and hard x-ray emission (HESSI and FERMI data), as well as the simulations of gyrosynchrotron emission, show that the nature of these sub-second oscillations in weak flares is determined by a common population of electrons and a common high-temperature source of emission with the temperature greater than 30 MK.

In collaboration with the Institute of Solar-Terrestrial Physics of the Siberian branch of RAS.

(Contact — V.M. Bogod).