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Annales Geophysicae An interactive open-access journal of the European Geosciences Union
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Volume 33, issue 8 | Copyright

Special issue: Dynamic processes in geospace

Ann. Geophys., 33, 955-964, 2015
https://doi.org/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

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 G. I. Korotova et al.
  • 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.

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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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