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On the fine structure of solar flare X-ray loop top sources

Published online by Cambridge University Press:  09 September 2016

Tomasz Mrozek  and
Sylwester Kołomański
Tomasz Mrozek
Affiliation:
Space Research Centre, Polish Academy of Sciences, ul. Kopernika 11, 51-622 Wrocław, Poland, email: [email protected] Astronomical Institute, University of Wrocław, ul. Kopernika 11, 51-622 Wrocław, Poland
Sylwester Kołomański
Affiliation:
Astronomical Institute, University of Wrocław, ul. Kopernika 11, 51-622 Wrocław, Poland
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Abstract

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Solar flare X-ray loop top sources (LTSs) are known since early observations from Skylab.They are always present accompanying long duration events (LDE), but their nature remains unclear. One of the main unknowns is spatial structure of LTSs. Observations indicate that LTSs are large and diffuse, but several authors suggested that there is present a fine, internal structure within them which should be resolved even using present space instrumentation.We present an example for the solar flare well observed by SDO/AIA and RHESSI. The LTS was dynamic with an episode of splitting into two sources. We performed detailed analysis of X-ray sources morphology using restored RHESSI images. Moreover, we conducted a number of simulations taking into account various possible spatial distributions of X-ray emission. We have found that in case of the flare investigated RHESSI should be capable to detect the fine structure if present. However it is not visible on the restored images. Some of our simulations suggest that we can also miss large, diffuse sources in the X-ray observations which may eventually lead to misinterpretation of the observed X-ray features.

Keywords

Sun: coronaSun: flaresSun: X-raysgamma rays
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 11 , Symposium S320: Solar and Stellar Flares and their Effects on Planets , August 2015 , pp. 74 - 79
Copyright
Copyright © International Astronomical Union 2016 

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