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The global statistical response of the outer radiation belt during geomagnetic storms

Murphy, K. R., Watt, C. E. J., Mann, I. R., Jonathan Rae, I., Sibeck, D. G., Boyd, A. J., Forsyth, C. F., Turner, D. L., Claudepierre, S. G., Baker, D. N., Spence, H. E., Reeves, G. D., Blake, J. B. and Fennell, J. (2018) The global statistical response of the outer radiation belt during geomagnetic storms. Geophysical Research Letters, 45 (9). pp. 3783-3792. ISSN 0094-8276

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To link to this item DOI: 10.1002/2017GL076674

Abstract/Summary

Using the total radiation belt electron content calculated from Van Allen Probe phase space density (PSD), the time-dependent and global response of the outer radiation belt during storms is statistically studied. Using PSD reduces the impacts of adiabatic changes in the main phase, allowing a separation of adiabatic and non-adiabatic effects, and revealing a clear modality and repeatable sequence of events in storm-time radiation belt electron dynamics. This sequence exhibits an important first adiabatic invariant (mu) dependent behaviour in the seed (150 MeV/G), relativistic (1000 MeV/G), and ultra-relativistic (4000 MeV/G) populations. The outer radiation belt statistically shows an initial phase dominated by loss followed by a second phase of rapid acceleration, whilst the seed population shows little loss and immediate enhancement. The time sequence of the transition to the acceleration is also strongly mu-dependent and occurs at low mu first, appearing to be repeatable from storm to storm.

Item Type:Article
Refereed:Yes
Divisions:Faculty of Science > School of Mathematical, Physical and Computational Sciences > Department of Meteorology
ID Code:76828
Publisher:American Geophysical Union

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