Abstract
We study thermal emission in solar flares using high-resolution X-ray spectra obtained with the Si detector of the Solar X-ray Spectrometer (SOXS) mission onboard the GSAT-2 Indian spacecraft launched in 2003. We model the spectral-temporal evolution of the medium-hard X-ray flux in terms of an evolving multi-temperature plasma governed by thermal conduction cooling and find agreement with the observations. By measuring the DEM power-law index for five M-class flares, we find that the emission in the 6–20 keV energy range is dominated by temperatures 15–50MK, while the power-law index of the thermal spectrum varies over 2.2–6.1. The mean value of the thermal conduction cooling time is 1,440 s; the temperature-dependent cooling time varies from 22 to 102 s.
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Jain, R., Rajpurohit, A.S., Aggarwal, M., Jamwal, R., Awasthi, A. (2010). Time-Varying Thermal Emission in Solar Flares. In: Hasan, S., Rutten, R. (eds) Magnetic Coupling between the Interior and Atmosphere of the Sun. Astrophysics and Space Science Proceedings. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-642-02859-5_58
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DOI: https://doi.org/10.1007/978-3-642-02859-5_58
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