Annales Geophysicae
Annales Geophysicae
Annales Geophysicae
Articles | Volume 33, issue 8
Articles | Volume 33, issue 8
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.

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.
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. 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.
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  • 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
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.

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.
Special issue
Dynamic processes in geospace
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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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