Physics of post-eruptive solar arcades: Interpretation of RATAN-600 and STEREO spacecraft observations

Details Physics of post-eruptive solar arcades: Interpretation of RATAN-600 and STEREO spacecraft observations Physics of post-eruptive solar arcades: Interpretation of RATAN-600 and STEREO spacecraft observations

Oct 2011

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011arep...55..918l&link_type=abstract

Astronomy Reports, Volume 55, Issue 10, pp.918-927

Astronomy and Astrophysics

Astronomy

Scientific paper

Results of simultaneous measurements of radiation fluxes from post-eruption arcades on the Sun at 171, 195, 284, and 304 Å (from STEREO spacecraft data) and at radio wavelengths (from the RATAN-600 radio telescope) are presented. An original probabilistic approach developed earlier by Urnov was used to determine the differential emission measure. This method requires no regularization, and the obtained results do not depend on the choice of the temperature grid. This approach has yielded the differential measure of emission at temperatures approximately from 0.3 to 15 MK. The subsequent calculation of thermal magnetobremsstrahlung in a multi-temperature model with the magnetic field decreasing with height produces a spectrum similar to that observed on RATAN-600. Thus, in many non-stationary events with modest powers, a thermal multi-temperature model is quite able to explain the emission of post-eruption arcade systems, and it is not necessary to invoke the emission of accelerated particles. The proposed model enables direct estimation of the ratio of the magnetic and gas pressures at the tops of post-eruption arcades, and determination of the conditions required for the origin of secondary nonstationary processes in the decay stage of the main flare.

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