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https://www.ias.ac.in/article/fulltext/joaa/029/01-02/0125-0145

Solar flares; X-ray detectors; X-ray line emission and continuum; break energy; microflares.

Solar X-ray Spectrometer (SOXS), the first space-borne solar astronomy experiment of India was designed to improve our current understanding of X-ray emission from the Sun in general and solar flares in particular. SOXS mission is composed of two solid state detectors, viz., Si and CZT semiconductors capable of observing the full disk Sun in X-ray energy range of 4–56 keV. The X-ray spectra of solar flares obtained by the Si detector in the 4–25 keV range show evidence of Fe and Fe/Ni line emission and multi-thermal plasma. The evolution of the break energy point that separates the thermal and non-thermal processes reveals increase with increasing flare plasma temperature. Small scale flare activities observed by both the detectors are found to be suitable to heat the active region corona; however their location appears to be in the transition region.

Rajmal Jain¹ Malini Aggarwal¹ Raghunandan Sharma¹

1. Physical Research Laboratory, Department of Space, Government of India, Navrangpura, Ahmedabad 380 009, India.

Published

6 March 2008