The implications of temporal variability in wave‐particle interactions in Earth's radiation belts

Watt, C. E. J. ORCID: https://orcid.org/0000-0003-3193-8993, Allison, H. J. ORCID: https://orcid.org/0000-0002-6665-2023, Thompson, R. L. ORCID: https://orcid.org/0000-0002-2766-0952, Bentley, S. N. ORCID: https://orcid.org/0000-0002-0095-1979, Meredith, N. P. ORCID: https://orcid.org/0000-0001-5032-3463, Glauert, S. A. ORCID: https://orcid.org/0000-0003-0149-8608, Horne, R. B. ORCID: https://orcid.org/0000-0002-0412-6407 and Rae, I. J. ORCID: https://orcid.org/0000-0002-2637-4786 (2021) The implications of temporal variability in wave‐particle interactions in Earth's radiation belts. Geophysical Research Letters, 48 (1). ISSN 1944-8007 doi: 10.1029/2020gl089962

Abstract/Summary

Changes in electron flux in Earth's outer radiation belt can be modeled using a diffusion‐based framework. Diffusion coefficients D for such models are often constructed from statistical averages of observed inputs. Here, we use stochastic parameterization to investigate the consequences of temporal variability in D. Variability time scales are constrained using Van Allen Probe observations. Results from stochastic parameterization experiments are compared with experiments using D constructed from averaged inputs and an average of observation‐specific D. We find that the evolution and final state of the numerical experiment depends upon the variability time scale of D; experiments with longer variability time scales differ from those with shorter time scales, even when the time‐integrated diffusion is the same. Short variability time scale experiments converge with solutions obtained using an averaged observation‐specific D, and both exhibit greater diffusion than experiments using the averaged‐input D. These experiments reveal the importance of temporal variability in radiation belt diffusion.

Additional Information	** Article version: VoR ** From Crossref journal articles via Jisc Publications Router ** Licence for VoR version of this article starting on 09-01-2021: http://creativecommons.org/licenses/by/4.0/ ** Journal IDs: pissn 0094-8276; eissn 1944-8007 ** History: published 16-01-2021; issued 09-01-2021; published_online 09-01-2021
Item Type	Article
URI	https://reading-clone.eprints-hosting.org/id/eprint/97097
Identification Number/DOI	10.1029/2020gl089962
Refereed	Yes
Divisions	Science > School of Mathematical, Physical and Computational Sciences > Department of Meteorology
Uncontrolled Keywords	General Earth and Planetary Sciences, Geophysics
Additional Information	** Article version: VoR ** From Crossref journal articles via Jisc Publications Router ** Licence for VoR version of this article starting on 09-01-2021: http://creativecommons.org/licenses/by/4.0/ ** Journal IDs: pissn 0094-8276; eissn 1944-8007 ** History: published 16-01-2021; issued 09-01-2021; published_online 09-01-2021
Publisher	American Geophysical Union (AGU)
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