Van Allen Probe observations of drift-bounce resonances with Pc 4 pulsations and wave–particle interactions in the pre-midnight inner magnetosphere

TitleVan Allen Probe observations of drift-bounce resonances with Pc 4 pulsations and wave–particle interactions in the pre-midnight inner magnetosphere
Publication TypeJournal Article
Year of Publication2015
AuthorsKorotova, GI, Sibeck, DG, Tahakashi, K, Dai, L, Spence, HE, Kletzing, CA, Wygant, JR, Manweiler, JW, Moya, PS, Hwang, K-J, Redmon, RJ
JournalAnnales Geophysicae
Volume33
Issue8
Pagination955 - 964
Date Published01/2015
Keywordsinner magnetosphere; Van Allen Probes
AbstractWe present Van Allen Probe B observations of azimuthally limited, antisymmetric, poloidal Pc 4 electric and magnetic field pulsations in the pre-midnight sector of the magnetosphere from 05:40 to 06:00 UT on 1 May 2013. Oscillation periods were similar for the magnetic and electric fields and proton fluxes. The flux of energetic protons exhibited an energy-dependent response to the pulsations. Energetic proton variations were anticorrelated at medium and low energies. Although we attribute the pulsations to a drift-bounce resonance, we demonstrate that the energy-dependent response of the ion fluxes results from pulsation-associated velocities sweeping energy-dependent radial ion flux gradients back and forth past the spacecraft.
URLhttp://www.ann-geophys.net/33/955/2015/angeo-33-955-2015.pdf
DOI10.5194/angeo-33-955-2015
Short TitleAnn. Geophys.


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