Magnetosonic wave instability analysis for proton ring distributions observed by the LANL magnetospheric plasma analyzer

Chen, Lunjin; Thorne, Richard M.; Jordanova, Vania K.; Thomsen, Michelle F.; Horne, Richard B. ORCID: https://orcid.org/0000-0002-0412-6407. 2011 Magnetosonic wave instability analysis for proton ring distributions observed by the LANL magnetospheric plasma analyzer. Journal of Geophysical Research, 116 (A3), A03223. 11, pp. 10.1029/2010JA016068

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Abstract/Summary

Energetic proton (1–45 keV) distributions measured by the magnetospheric plasma analyzer detector on Los Alamos National Laboratory geosynchronous orbiting satellites are analyzed to study the characteristics of proton ring development during the 2001 April storm. Distinct proton rings are formed over a broad spatial region from noon to premidnight, associated with individual or multiple substorm injections on the nightside. On the basis of observed proton distributions, the convective growth rate of magnetosonic waves is calculated. We find that these proton ring distributions can provide a source of free energy for exciting magnetosonic waves, with convective growth rate mostly in the range 10−5–10−6 m−1, over a broad range of frequency from a few times ΩH+ up to ~35 ΩH+ and over a broad magnetic local time range from 1000 to 2200.

Item Type:	Publication - Article
Digital Object Identifier (DOI):	10.1029/2010JA016068
Programmes:	BAS Programmes > Polar Science for Planet Earth (2009 - ) > Climate
ISSN:	0148-0227
Additional Keywords:	magnetosonic waves, proton ring, magnetospheric plasma analyzer
NORA Subject Terms:	Physics Atmospheric Sciences
Date made live:	26 May 2011 12:53 +0 (UTC)
URI:	https://nora.nerc.ac.uk/id/eprint/14035

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