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

G. I. Korotova; G. I. Korotova; D. G. Sibeck; K. Tahakashi; L. Dai; H. E. Spence; C. A. Kletzing; J. R. Wygant; J. W. Manweiler; P. S. Moya; K.-J. Hwang; R. J. Redmon

doi:10.5194/angeo-33-955-2015

Annales Geophysicae (Aug 2015)

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

G. I. Korotova,
G. I. Korotova,
D. G. Sibeck,
K. Tahakashi,
L. Dai,
H. E. Spence,
C. A. Kletzing,
J. R. Wygant,
J. W. Manweiler,
P. S. Moya,
K.-J. Hwang,
R. J. Redmon

Affiliations

G. I. Korotova: IZMIRAN, Russian Academy of Sciences, Moscow, Troitsk, Russia
G. I. Korotova: IPST, University of Maryland, College Park, MD, USA
D. G. Sibeck: Code 674, NASA/GSFC, Greenbelt, MD, USA
K. Tahakashi: JHU/APL, Laurel, MD, USA
L. Dai: University of Minnesota, Minneapolis, MN, USA
H. E. Spence: EOS, University of New Hampshire, Durham, NH, USA
C. A. Kletzing: Iowa University, Iowa City, IA, USA
J. R. Wygant: University of Minnesota, Minneapolis, MN, USA
J. W. Manweiler: Fundamental Technologies, LLC, Lawrence, KS, USA
P. S. Moya: Code 673, NASA/GSFC, Greenbelt, MD, USA
K.-J. Hwang: Code 674, NASA/GSFC, Greenbelt, MD, USA
R. J. Redmon: NGDC/NOAA, Boulder, CO, USA

DOI: https://doi.org/10.5194/angeo-33-955-2015
Journal volume & issue: Vol. 33
pp. 955 – 964

Abstract

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We 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.

Published in Annales Geophysicae

ISSN: 0992-7689 (Print); 1432-0576 (Online)
Publisher: Copernicus Publications
Country of publisher: Germany
LCC subjects: Science: Physics: Geophysics. Cosmic physics
Website: http://www.annales-geophysicae.net

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