caa a22 4500 44534606X CHVBK 20180317142829.0 cr unu---uuuuu 170323e20110501xx s 000 0 eng 10.1007/s11207-011-9754-1 doi (NATIONALLICENCE)springer-10.1007/s11207-011-9754-1 Energy-Dependent Timing of Thermal Emission in Solar Flares [Elektronische Daten] [Rajmal Jain, Arun Awasthi, Arvind Rajpurohit, Markus Aschwanden] We report solar flare plasma to be multi-thermal in nature based on the theoretical model and study of the energy-dependent timing of thermal emission in ten M-class flares. We employ high-resolution X-ray spectra observed by the Si detector of the "Solar X-ray Spectrometer” (SOXS). The SOXS onboard the Indian GSAT-2 spacecraft was launched by the GSLV-D2 rocket on 8 May 2003. Firstly we model the spectral evolution of the X-ray line and continuum emission flux F(ε) from the flare by integrating a series of isothermal plasma flux. We find that the multi-temperature integrated flux F(ε) is a power-law function of ε with a spectral index (γ)≈−4.65. Next, based on spectral-temporal evolution of the flares we find that the emission in the energy range E=4 - 15keV is dominated by temperatures of T=12 - 50MK, while the multi-thermal power-law DEM index (δ) varies in the range of −4.4 and −5.7. The temporal evolution of the X-ray flux F(ε,t) assuming a multi-temperature plasma governed by thermal conduction cooling reveals that the temperature-dependent cooling time varies between 296 and 4640s and the electron density (n e) varies in the range of n e=(1.77 - 29.3)×1010cm−3. Employing temporal evolution technique in the current study as an alternative method for separating thermal from nonthermal components in the energy spectra, we measure the break-energy point, ranging between 14 and 21±1.0keV. Springer Science+Business Media B.V., 2011 Conduction cooling nationallicence Solar flares: multi-thermal, nonthermal nationallicence Jain Rajmal Physical Research Laboratory (Dept. of Space, Govt. of India), 380 009, Navrangpura, Ahmedabad, India aut Awasthi Arun Physical Research Laboratory (Dept. of Space, Govt. of India), 380 009, Navrangpura, Ahmedabad, India aut Rajpurohit Arvind Physical Research Laboratory (Dept. of Space, Govt. of India), 380 009, Navrangpura, Ahmedabad, India aut Aschwanden Markus Solar and Astrophysics Laboratory, Lockheed Martin Advanced Technology Center, Palo Alto, CA, USA aut Solar Physics Springer Netherlands 270/1(2011-05-01), 137-149 0038-0938 270:1<137 2011 270 11207 https://doi.org/10.1007/s11207-011-9754-1 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s11207-011-9754-1 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Jain Rajmal Physical Research Laboratory (Dept. of Space, Govt. of India), 380 009, Navrangpura, Ahmedabad, India aut NATIONALLICENCE 700 1- Awasthi Arun Physical Research Laboratory (Dept. of Space, Govt. of India), 380 009, Navrangpura, Ahmedabad, India aut NATIONALLICENCE 700 1- Rajpurohit Arvind Physical Research Laboratory (Dept. of Space, Govt. of India), 380 009, Navrangpura, Ahmedabad, India aut NATIONALLICENCE 700 1- Aschwanden Markus Solar and Astrophysics Laboratory, Lockheed Martin Advanced Technology Center, Palo Alto, CA, USA aut NATIONALLICENCE 773 0- Solar Physics Springer Netherlands 270/1(2011-05-01), 137-149 0038-0938 270:1<137 2011 270 11207 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer