(2022) The high-energy Sun - probing the origins of particle acceleration on our nearest star. Experimental Astronomy, 54 . pp. 335-360. doi:10.1007/s10686-021-09798-6 ISSN 0922-6435.

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Abstract

As a frequent and energetic particle accelerator, our Sun provides us with an excellent astrophysical laboratory for understanding the fundamental process of particle acceleration. The exploitation of radiative diagnostics from electrons has shown that acceleration operates on sub-second time scales in a complex magnetic environment, where direct electric fields, wave turbulence, and shock waves all must contribute, although precise details are severely lacking. Ions were assumed to be accelerated in a similar manner to electrons, but γ-ray imaging confirmed that emission sources are spatially separated from X-ray sources, suggesting distinctly different acceleration mechanisms. Current X-ray and γ-ray spectroscopy provides only a basic understanding of accelerated particle spectra and the total energy budgets are therefore poorly constrained. Additionally, the recent detection of relativistic ion signatures lasting many hours, without an electron counterpart, is an enigma. We propose a single platform to directly measure the physical conditions present in the energy release sites and the environment in which the particles propagate and deposit their energy. To address this fundamental issue, we set out a suite of dedicated instruments that will probe both electrons and ions simultaneously to observe; high (seconds) temporal resolution photon spectra (4 keV – 150 MeV) with simultaneous imaging (1 keV – 30 MeV), polarization measurements (5–1000 keV) and high spatial and temporal resolution imaging spectroscopy in the UV/EUV/SXR (soft X-ray) regimes. These instruments will observe the broad range of radiative signatures produced in the solar atmosphere by accelerated particles.

Item Type:	Journal Article
Subjects:	Q Science > QB Astronomy
Divisions:	Faculty of Science, Engineering and Medicine > Science > Physics
SWORD Depositor:	Library Publications Router
Library of Congress Subject Headings (LCSH):	Particle acceleration , Solar flares , Sun -- Corona , X-ray astronomy
Journal or Publication Title:	Experimental Astronomy
Publisher:	Springer
ISSN:	0922-6435
Official Date:	December 2022
Dates:	Date Event December 2022 Published 9 November 2021 Available 23 September 2021 Accepted
Volume:	54
Page Range:	pp. 335-360
DOI:	10.1007/s10686-021-09798-6
Status:	Peer Reviewed
Publication Status:	Published
Reuse Statement (publisher, data, author rights):	** Article version: VoR ** From Crossref journal articles via Jisc Publications Router ** History: epub 09-11-2021; issued 09-11-2021. ** Licence for VoR version of this article starting on 09-11-2021: https://creativecommons.org/licenses/by/4.0
Access rights to Published version:	Open Access (Creative Commons)
Date of first compliant deposit:	15 December 2021
Date of first compliant Open Access:	15 December 2021
RIOXX Funder/Project Grant:	Project/Grant ID RIOXX Funder Name Funder ID ST/M000826/1 [STFC] Science and Technology Facilities Council http://dx.doi.org/10.13039/501100000271 ST/R003246/1 [STFC] Science and Technology Facilities Council http://dx.doi.org/10.13039/501100000271 ST/N004981/1 [STFC] Science and Technology Facilities Council http://dx.doi.org/10.13039/501100000271
Related URLs:	https://creativecommons.org/licenses/by/...

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