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We investigate the evolution of differential emission measure distribution(DEM[T]) in various phases of a B8.3 flare, which occurred on July 04, 2009. Weanalyze the soft X-ray (SXR) emission in 1.6-8.0 keV range, recordedcollectively by Solar Photometer in X-rays (SphinX; Polish) and Solar X-raySpectrometer (SOXS; Indian) instruments. We make a comparative investigation ofthe best-fit DEM[T] distributions derived by employing various inversionschemes viz. single gaussian, power-law, functions and Withbroe-Sylwester (W-S)maximum likelihood algorithm. In addition, SXR spectrum in three differentenergy bands viz. 1.6-5.0 keV (low), 5.0-8.0 keV (high) and 1.6-8.0 keV(combined) is analyzed to determine the dependence of the best-fit DEM[T]distribution on the selection of energy interval. The evolution of DEM[T]distribution, derived using W-S algorithm, reveals the plasma of multi-thermalnature during the rise to the maximum phase of the flare, while of isothermalnature in the post-maximum phase of the flare. Thermal energy content isestimated considering the flare plasma to be of 1) iso-thermal and 2)multi-thermal nature. We find that the energy content during the flare,estimated from the multi-thermal approach, is in good agreement with thatderived using the iso-thermal assumption except during the maximum of theflare. Further, (multi-) thermal energy estimated employing low-energy band ofthe SXR spectrum result in higher values than that derived from thecombined-energy band. On the contrary, the analysis of high-energy band of SXRspectrum lead to lower thermal energy than that estimated from thecombined-energy band.

Thermal characteristics and the differential emission measure distribution during a B8.3 flare on July 04, 2009