Van Allen Probe observations of drift-bounce resonances with Pc 4 pulsations and wave–particle interactions in the pre-midnight inner magnetosphere
G. I. Korotova1,2,D. G. Sibeck3,K. Tahakashi4,L. Dai5,H. E. Spence6,C. A. Kletzing7,J. R. Wygant8,J. W. Manweiler9,P. S. Moya10,K.-J. Hwang3,and R. J. Redmon11G. I. Korotova et al.G. I. Korotova1,2,D. G. Sibeck3,K. Tahakashi4,L. Dai5,H. E. Spence6,C. A. Kletzing7,J. R. Wygant8,J. W. Manweiler9,P. S. Moya10,K.-J. Hwang3,and R. J. Redmon11
Received: 21 Jan 2015 – Revised: 24 Apr 2015 – Accepted: 24 Jun 2015 – Published: 05 Aug 2015
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.
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.
We studied localized Pc 4 pulsations in the pre-midnight inner magnetosphere observed by Van...