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Title: Proton cyclotron and mirror instabilities in marginally stable solar wind plasma
ABSTRACT This paper formulates a velocity moment-based quasi-linear theory that combines the impacts of weakly unstable proton–cyclotron- (or, equivalently, electromagnetic ion cyclotron) and proton-mirror instabilities on the solar wind plasma initially characterized by an excessive perpendicular proton temperature anisotropy. The present formalism is an alternative to the existing model in that the weakly unstable modes are characterized by analytical formalism that involves the assumption of weak growth rate and/or fluid-theoretical dispersion relation, in place of numerical root-finding method based on the transcendental plasma dispersion function. This results in an efficient numerical platform for analyzing the quasi-linear development of the said instabilities. Such a formalism may be useful in the larger context of global solar wind modelling effort where an efficient calculation of self-consistent wave–particle interaction process is called for. A direct comparison with spacecraft observations of solar wind proton data distribution shows that the present weak growth rate formalism of quasi-linear calculation produces results that are consistent with the observation.
Authors:
; ; ; ;
Award ID(s):
1842643
Publication Date:
NSF-PAR ID:
10325732
Journal Name:
Monthly Notices of the Royal Astronomical Society
Volume:
509
Issue:
4
Page Range or eLocation-ID:
4736 to 4744
ISSN:
0035-8711
Sponsoring Org:
National Science Foundation
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