Annales Geophysicae
Annales Geophysicae
ANGEO
Articles | Volume 33, issue 8
Articles | Volume 33, issue 8
https://doi.org/10.5194/angeo-33-955-2015
© Author(s) 2015. This work is distributed under
the Creative Commons Attribution 3.0 License.
Special issue:
https://doi.org/10.5194/angeo-33-955-2015
© Author(s) 2015. This work is distributed under
the Creative Commons Attribution 3.0 License.
Articles | Volume 33, issue 8
Regular paper
 | 
05 Aug 2015
Regular paper |  | 05 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, 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, and R. J. Redmon

Abstract. 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.

How to cite. Korotova, G. I., Sibeck, D. G., Tahakashi, K., Dai, L., Spence, H. E., Kletzing, C. A., Wygant, J. R., Manweiler, J. W., Moya, P. S., Hwang, K.-J., and Redmon, R. J.: Van Allen Probe observations of drift-bounce resonances with Pc 4 pulsations and wave–particle interactions in the pre-midnight inner magnetosphere, Ann. Geophys., 33, 955–964, https://doi.org/10.5194/angeo-33-955-2015, 2015.
Received: 21 Jan 2015 – Revised: 24 Apr 2015 – Accepted: 24 Jun 2015 – Published: 05 Aug 2015
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Short summary
We studied localized Pc 4 pulsations in the pre-midnight inner magnetosphere observed by Van Allen Probe B on May 1 2013. Although we attribute the pulsations to a drift-bounce resonance, we demonstrate that the energy-dependent response of the ion fluxes result from pulsation-associated velocities sweeping energy-dependent radial ion flux gradients back and forth past the spacecraft.
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Special issue
Dynamic processes in geospace