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Solar Microflares Observed by SphinX and RHESSI View all abstracts by submitter

Tomasz Mrozek   Submitted: 2018-07-12 02:19

In 2009 the Russian Complex Orbital Observations Near-Earth of Activity of the Sun (CORONAS-Photon) satellite was launched carrying the Polish Solar PHotometer In X-rays (SphinX). The SphinX was the most sensitive in the spectral range 1.2-15 keV thus an excellent opportunity appeared for comparison with low-energy end of Ramaty High Energy Solar Spectroscopic Imager (RHESSI) spectra. Common spectral measurements with these instruments cover the range where most of the flare energy is accumulated. We have chosen four consecutive small solar events observed on 4 July 2009 at 13:43 UT, 13:48 UT, 13:52 UT, and 13:55 UT, ( RHESSI flare peak times) and used them for comparison of the data and results from both instruments. Moreover, we included Geostationary Operational Environmental Satellite (GOES) records in our analysis. In practice the range of comparison performed for SphinX and RHESSI is limited roughly to 3-6 keV. RHESSI's fluxes measured with a use of one, four, and nine detectors in the 3-4 keV energy band agree with SphinX measurements. However, we observed that SphinX spectral irradiances are three times higher than RHESSI in the 4-6 keV energy band. This effect contributes to the difference in obtained emission measures, but the derived temperatures of plasma components are similar. RHESSI spectra were fitted using a model with two thermal components. We have found that RHESSI hot component is in agreement with GOES and RHESSI hotter component fits well with the SphinX flaring component.Moreover, we calculated the so-called thermodynamic measure and the total thermal energy content in the four microflares studied. The results obtained show that SphinX is a very sensitive complementary observatory for RHESSI and GOES.

Authors: Tomasz Mrozek, Szymon Gburek, Marek Siarkowski, Barbara Sylwester, Janusz Sylwester, Anna Kepa, Magdalena Gryciuk
Projects: CORONAS-F/SphinX,RHESSI

Publication Status: published
Last Modified: 2018-07-17 10:51
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