Comparing electron precipitation fluxes calculated from pitch angle diffusion coefficients to LEO satellite observations

Reidy, J.A. ORCID: https://orcid.org/0000-0002-7939-991X; Horne, R.B. ORCID: https://orcid.org/0000-0002-0412-6407; Glauert, S.A. ORCID: https://orcid.org/0000-0003-0149-8608; Clilverd, M. ORCID: https://orcid.org/0000-0002-7388-1529; Meredith, N.P. ORCID: https://orcid.org/0000-0001-5032-3463; Woodfield, E. ORCID: https://orcid.org/0000-0002-0531-8814; Ross, J.P. ORCID: https://orcid.org/0000-0001-5282-3293; Allison, H.J.; Rodger, C.J.. 2021 Comparing electron precipitation fluxes calculated from pitch angle diffusion coefficients to LEO satellite observations. Journal of Geophysical Research: Space Physics, 126 (3), e2020JA028410. 18, pp. https://doi.org/10.1029/2020JA028410

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Text (Open Access) © 2021. The Authors. This is an open access article under the terms of the Creative Commons Attribution-NonCommercial-NoDerivs License, which permits use and distribution in any medium, provided the original work is properly cited, the use is non-commercial and no modifications or adaptations are made. 2020JA028410.pdf - Published Version Available under License Creative Commons Attribution Non-commercial No Derivatives 4.0. Download (1MB) | Preview

Abstract/Summary

Particle precipitation is a loss mechanism from the Radiation Belts whereby particles trapped by the Earth’s magnetic field are scattered into the loss cone due to wave‐particle interactions. Energetic electron precipitation creates ozone destroying chemicals which can affect the temperatures of the polar regions, therefore it is crucial to accurately quantify this impact on the Earth’s atmosphere. We use bounce‐averaged pitch angle diffusion coefficients for whistler mode chorus waves, plasmaspheric hiss and atmospheric collisions to calculate magnetic local time (MLT) dependent electron precipitation inside the field of view of the Polar Orbiting Environmental Satellites (POES) T0 detector, between 26‐30 March 2013. These diffusion coefficients are used in the BAS Radiation Belt Model (BAS‐RBM) and this paper is a first step towards testing the loss in this model via comparison with real world data. We find the best agreement between the calculated and measured T0 precipitation at L* > 5 on the dawnside for the > 30keV electron channel, consistent with precipitation driven by lower band chorus. Additional diffusion is required to explain the flux at higher energies and on the dusk side. The POES T0 detector underestimates electron precipitation as its field of view does not measure the entire loss cone. We demonstrate the potential for utilizing diffusion coefficients to reconstruct precipitating flux over the entire loss cone. Our results show that the total precipitation can exceed that measured by the POES > 30 keV electron channel by a factor that typically varies from 1 to 10 for L* = 6, 6.5 and 7.

Item Type:	Publication - Article
Digital Object Identifier (DOI):	https://doi.org/10.1029/2020JA028410
ISSN:	2169-9402
Additional Keywords:	electron precipitation
Date made live:	23 Feb 2021 09:19 +0 (UTC)
URI:	https://nora.nerc.ac.uk/id/eprint/528044

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