Astronomy and Astrophysics – Astronomy
Scientific paper
Aug 2003
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003basbr..23q.180r&link_type=abstract
Boletim da Sociedade Astronômica Brasileira (ISSN 0101-3440), vol.23, no.1, p. 180-180
Astronomy and Astrophysics
Astronomy
Scientific paper
Since its first light on February 2002, the RHESSI satellite has detected more than 7900 solar flares. From these, 14 events were selected among the most energetic ones with emission reaching at least up to 300keV. This sample was analyzed in 197 energy channels, from 3 to 600keV, with 4s time resolution and spectral resolution of 1keV from 3keV to 100keV, and 5keV from 100keV to 600keV. The X-ray spectrum is known to follow a power law, actually a double power law most of the time. In the latter case, the spectral index changes its value above a certain energy, namely the "break energy". The main goal of this work is a comparative study of the spectral parameters, such as the break energy and the power-law indices, below and above the break, as well as their temporal evolution. The data reduction was carried out through The SolarSoftWare (SSW) System and the Spectral Executive (SPEX) package. The resulting photon spectra were fitted by a thermal emission plus a double power law model. We discuss the spectral parameters obtained by these fits, and their evolution in time. The results are interpreted in light of the accelerated electrons that produced the X-ray photons during the flares.
Andrei Alexander H.
Reis Neto E.
Silva Adriana V. R.
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