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| Titel |
Electric diffusion coefficient calculated based on in situ electric field
measurements by THEMIS |
| VerfasserIn |
Wenlong Liu, Weichao Tu, Xinlin Li, Theodore Sarris, Yuri Khotyaintsev, Huishan Fu, Hui Zhang, Quanqi Shi |
| Konferenz |
EGU General Assembly 2016
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| Medientyp |
Artikel
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| Sprache |
en
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 18 (2016) |
| Datensatznummer |
250124213
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| Publikation (Nr.) |
 EGU/EGU2016-3608.pdf |
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| Zusammenfassung |
| Based on eight years’ observations from THEMIS, we investigate the statistical distribution
of electric field Pc5 ULF wave power under different geomagnetic activities and
calculate the radial diffusion coefficient due to electric field, DLLE, for outer radiation
belt electrons. A simple empirical expression of DLLE[THEMIS] is also derived.
Subsequently we compare DLLE[THEMIS] to previous DLLmodels, and find similar Kp
dependence with the DLLE[CRRES] model, which is also based on in-situ electric field
measurements. The absolute value of DLLE[THEMIS] is constantly higher than
DLLE[CRRES], probably due to the limited orbital coverage of CRRES. The differences
between DLLE[THEMIS] and the commonly-used DLLB[B-A] and DLLE[Ozeke]
models are significant, especially in Kp dependence and energy dependence. Possible
reasons for these differences and their implications are discussed. The diffusion
coefficient provided in this paper, which also has energy dependence, will be an
important contributor to quantify the radial diffusion process of radiation belt electrons. |
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