Issue |
A&A
Volume 676, August 2023
Solar Orbiter First Results (Nominal Mission Phase)
|
|
---|---|---|
Article Number | A58 | |
Number of page(s) | 7 | |
Section | The Sun and the Heliosphere | |
DOI | https://doi.org/10.1051/0004-6361/202345909 | |
Published online | 07 August 2023 |
Anisotropies of solar energetic electrons in the MeV range measured with Solar Orbiter/EPD/HET
1
Institute of Experimental & Applied Physics, Kiel University, 24118 Kiel, Germany
e-mail: fleth@physik.uni-kiel.de
2
Space Research Group/Universidad de Alcalá, Madrid, Spain
3
Department of Physics and Astronomy, University of Turku, Turku, Finland
Received:
13
January
2023
Accepted:
2
April
2023
Aims. This study analyses relativistic electron measurements obtained by the High Energy Telescope (HET) aboard Solar Orbiter in the energy range from 200 keV to above 10 MeV. Caveats of these measurements are discussed. The purpose of this study is to analyse anisotropies of relativistic solar energetic electrons utilising the different viewing directions of HET.
Methods. We identified time periods of interest, that is, those with enhanced electron flux due to a significant solar component, and composed a list of these time periods, including additional observations such as maximum energy and flux as well as the first-order anistropy.
Results. This study provides an overview of HET measurements of MeV electrons and a list of time periods of enhanced flux of relativistic solar electrons, 21 in total. For the first time with Solar Orbiter/EPD/HET, the anisotropies of high-energy electrons have been measured. Specifically, we find three time periods with significant anisotropy above 1 MeV within 0.5 au.
Key words: Sun: corona / Sun: heliosphere / Sun: particle emission / instrumentation: detectors / methods: data analysis
© The Authors 2023
Open Access article, published by EDP Sciences, under the terms of the Creative Commons Attribution License (https://creativecommons.org/licenses/by/4.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
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