RHESSI Microflare Statistics: X-ray Imaging And Spectral Analysis

Astronomy and Astrophysics – Astronomy

Scientific paper

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Scientific paper

We present x-ray imaging and spectral analysis of all microflares the Reuven Ramaty High Energy Solar Spectroscopic Imager (RHESSI) observed between March 2002 and March 2007, a total of 24,799 events. These microflares are small flares, below C Class, and were found by searching 6-12 keV during periods when the full sensitivity RHESSI’s detectors were available. Each microflare is automatically analysed: the thermal source size is found by forward fitting the complex visibilities for 4-8 keV and the spectral parameters (temperature, emission measure, power-law index) are found by forward fitting a thermal plus non-thermal spectral model. This wealth of information allows us to investigate many aspects of these microflares and in particular the thermal and non-thermal energy distributions of these events.

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