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; R. J. Redmon

doi:10.5194/angeo-33-955-2015

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, R. J. Redmon

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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.

Original language	English (US)
Pages (from-to)	955-964
Number of pages	10
Journal	Annales Geophysicae
Volume	33
Issue number	8
DOIs	https://doi.org/10.5194/angeo-33-955-2015
State	Published - Aug 5 2015

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Publisher Copyright:
© Author(s) 2015.

Keywords

Solar physics astrophysics and astronomy (wave-particle interactions)

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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., & Redmon, R. J. (2015). Van Allen Probe observations of drift-bounce resonances with Pc 4 pulsations and wave-particle interactions in the pre-midnight inner magnetosphere. Annales Geophysicae, 33(8), 955-964. https://doi.org/10.5194/angeo-33-955-2015

Korotova, GI, Sibeck, DG, Tahakashi, K, Dai, L, Spence, HE, Kletzing, CA, Wygant, JR, Manweiler, JW, Moya, PS, Hwang, KJ & Redmon, RJ 2015, 'Van Allen Probe observations of drift-bounce resonances with Pc 4 pulsations and wave-particle interactions in the pre-midnight inner magnetosphere', Annales Geophysicae, vol. 33, no. 8, pp. 955-964. https://doi.org/10.5194/angeo-33-955-2015

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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.",

keywords = "Solar physics astrophysics and astronomy (wave-particle interactions)",

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AU - Korotova, G. I.

AU - Sibeck, D. G.

AU - Tahakashi, K.

AU - Dai, L.

AU - Spence, H. E.

AU - Kletzing, C. A.

AU - Wygant, J. R.

AU - Manweiler, J. W.

AU - Moya, P. S.

AU - Hwang, K. J.

AU - Redmon, R. J.

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N2 - 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.

AB - 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.

KW - Solar physics astrophysics and astronomy (wave-particle interactions)

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Van Allen Probe observations of drift-bounce resonances with Pc 4 pulsations and wave-particle interactions in the pre-midnight inner magnetosphere

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