Journal cover Journal topic
Annales Geophysicae An open-access journal of the European Geosciences Union
Ann. Geophys., 33, 955-964, 2015
http://www.ann-geophys.net/33/955/2015/
doi:10.5194/angeo-33-955-2015
© Author(s) 2015. This work is distributed
under the Creative Commons Attribution 3.0 License.
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. 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 1IZMIRAN, Russian Academy of Sciences, Moscow, Troitsk, Russia
2IPST, University of Maryland, College Park, MD, USA
3Code 674, NASA/GSFC, Greenbelt, MD, USA
4JHU/APL, Laurel, MD, USA
5University of Minnesota, Minneapolis, MN, USA
6EOS, University of New Hampshire, Durham, NH, USA
7Iowa University, Iowa City, IA, USA
8University of Minnesota, Minneapolis, MN, USA
9Fundamental Technologies, LLC, Lawrence, KS, USA
10Code 673, NASA/GSFC, Greenbelt, MD, USA
11NGDC/NOAA, Boulder, CO, USA
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.

Citation: 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, doi:10.5194/angeo-33-955-2015, 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.
We studied localized Pc 4 pulsations in the pre-midnight inner magnetosphere observed by Van...
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