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Time-informed X-ray Spectral Analysis of RHESSI, Fermi/GBM, and STIX Flares

Presentation #110.15 in the session Data Analysis Techniques Posters.

Published onSep 18, 2023
Time-informed X-ray Spectral Analysis of RHESSI, Fermi/GBM, and STIX Flares

Bremsstrahlung X-rays from solar flares are excellent diagnostics of very hot (~10MK) coronal plasma (thermal particles), as well as particles which are accelerated into the tail of the thermal plasma distribution (nonthermal particles). Previous studies have shown that a significant fraction (~10% to 50%) of energy released during a solar flare can go into accelerating particles, so these particles are an important aspect of the solar flare energy budget. Observers use spectroscopy to separate emission from thermal and nonthermal particles, but it is often difficult to determine the low-energy behavior of nonthermal emission because there are so many more thermal electrons and X-rays. We apply the general technique of multifractal spectra to Fermi/GBM, STIX, and RHESSI data to quantify thermal vs. nonthermal emission using timeseries information. Then, we apply a novel temporal-spectral technique which decomposes timeseries into “template” thermal and nonthermal timeseries to produce two separate, physically-informed spectra, using data from those same instruments. These techniques offer an alternative tool to identify the low-energy behavior of nonthermal spectra, and may be applied to e.g. future microflare studies to more confidently identify nonthermal emission.

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