Hudson, H. S. , MacKinnon, A. , Szydlarski, M. and Carlsson, M. (2020) Cosmic ray interactions in the solar atmosphere. Monthly Notices of the Royal Astronomical Society, 491(4), pp. 4852-4856. (doi: 10.1093/mnras/stz3373)
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Abstract
High-energy particles enter the solar atmosphere from Galactic or solar coronal sources, and produce ‘albedo’ emission from the quiet Sun that is now observable across a wide range of photon energies. The interaction of high-energy particles in a stellar atmosphere depends essentially upon the joint variation of the magnetic field and plasma density, which heretofore has been characterized parametrically as P ∝ Bα with P the gas pressure and B the magnitude of the magnetic field. We re-examine that parametrization by using a self-consistent 3D MHD model (Bifrost) and show that this relationship tends to P ∝ B3.5 ± 0.1 based on the visible portions of the sample of open-field flux tubes in such a model, but with large variations from point to point. This scatter corresponds to the strong meandering of the open-field flux tubes in the lower atmosphere, which will have a strong effect on the prediction of the emission anisotropy (limb brightening). The simulations show that much of the open flux in coronal holes originates in weak-field regions within the granular pattern of the convective motions seen in the simulations.
| Item Type: | Articles |
|---|---|
| Status: | Published |
| Refereed: | Yes |
| Glasgow Author(s) Enlighten ID: | MacKinnon, Dr Alexander and Hudson, Dr Hugh |
| Authors: | Hudson, H. S., MacKinnon, A., Szydlarski, M., and Carlsson, M. |
| College/School: | College of Science and Engineering > School of Physics and Astronomy |
| Journal Name: | Monthly Notices of the Royal Astronomical Society |
| Publisher: | Oxford University Press |
| ISSN: | 0035-8711 |
| ISSN (Online): | 1365-2966 |
| Published Online: | 17 December 2019 |
| Copyright Holders: | Copyright © 2019 The Authors |
| First Published: | First published in Monthly Notices of the Royal Astronomical Society 491(4): 4852-4856 |
| Publisher Policy: | Reproduced in accordance with the publisher copyright policy |
| Related URLs: |
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