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Peer-reviewed

Study of Time Evolution of Thermal and Nonthermal Emission from an M-class Solar Flare

Shunsaku Nagasawa, Tomoko Kawate, Noriyuki Narukage, Tadayuki Takahashi, Amir Caspi, T. N. Woods

The Astrophysical Journal · 2022

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Summary

Abstract We conduct a wide-band X-ray spectral analysis in the energy range of 1.5–100 keV to study the time evolution of the M7.6-class flare of 2016 July 23, with the Miniature X-ray Solar Spectrometer (MinXSS) CubeSat and the Reuven Ramaty High Energy Solar Spectroscopic Imager (RHESSI) spacecraft. With the combination of MinXSS for soft X-rays and RHESSI for hard X-rays, a nonthermal component and three-temperature multithermal component—“cool” ( T ≈ 3 MK), “hot” ( T ≈ 15 MK), and “superhot” ( T ≈ 30 MK)—were measured simultaneously. In addition, we successfully obtained the spectral evolution of the multithermal and nonthermal components with a 10 s cadence, which corresponds to the Alfvén timescale in the solar corona. We find that the emission measures of the cool and hot thermal co

Source type
Peer-reviewed study
DOI
10.3847/1538-4357/ac7532
Catalogue ID
BFmoakvhek-8yib26
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