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Annales Geophysicae An interactive open-access journal of the European Geosciences Union
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Preprints
https://doi.org/10.5194/angeo-2020-32
© Author(s) 2020. This work is distributed under
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/angeo-2020-32
© Author(s) 2020. This work is distributed under
the Creative Commons Attribution 4.0 License.

Submitted as: regular paper 26 Jun 2020

Submitted as: regular paper | 26 Jun 2020

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This preprint is currently under review for the journal ANGEO.

Multipoint Observations of Compressional Pc5 Pulsations in the Dayside Magnetosphere and Corresponding Particle Signatures

Galina Korotova1,2, David Sibeck3, Mark Engebretson4, Michael Balikhin5, Scott Thaller6, Craig Kletzing7, Harlan Spence8, and Robert Redmon9 Galina Korotova et al.
  • 1IPST, University of Maryland, College Park, MD, USA
  • 2IZMIRAN, Russian Academy of Sciences, Moscow, Troitsk, Russia
  • 3NASA/GSFC, Code 674, Greenbelt, MD, USA
  • 4Department of Physics, Augburg University, Minneapolis, MN, USA
  • 5Department of Automatic Control and Systems Engineering, University of Sheffield, Sheffield, UK
  • 6LASP, University of Colorado, Boulder, CO, USA
  • 7Department of Physics and Astronomy, Iowa University, Iowa City, IA, USA
  • 8EOS, University of New Hampshire, Durham, NH, USA
  • 9Solar and Terrestrial Physics division, NGDC/NOAA, Boulder, CO, USA

Abstract. We use Van Allen Probes and GOES-13 and -15 multipoint magnetic field, electric field, plasma, and energetic particle observations to study the spatial, temporal, and spectral characteristics of compressional Pc5 pulsations observed during the recovery phase of a strong geomagnetic storm on January 1, 2016. From ~ 19:00 UT to 23:02 UT, successive magnetospheric compressions enhanced the peak-to-peak amplitudes of Pc5 waves with 4.5–6.0 mHz frequencies from 0–2 to 10–15 nT at both Van Allen Probes A and B, particularly in the prenoon magnetosphere. Poloidal Pc4 pulsations with frequencies of ~ 22–29 mHz were present in the radial Bx component. The frequencies of these Pc4 pulsations diminished with increasing radial distance, as expected for resonant Alfvén waves standing along field lines. The GOES spacecraft observed Pc5 pulsations with similar frequencies to those seen by the Van Allen Probes, but Pc4 pulsations with lower frequencies.

Both Van Allen Probes A and B observed frequency doubling in the compressional component of the magnetic field during the Pc5 waves, indicating a meridional sloshing of the equatorial node over a combined range in ZSM from 0.25 to −0.08 Re, suggesting that the amplitude of this meridional oscillation was ~ 0.16 Re about an equatorial node whose mean position was near ZSM = ~ 0.08 Re. Van Allen Probes A and B HOPE and MagEIS observations provide the first evidence for a corresponding frequency doubling in the plasma density and the flux of energetic electron, respectively. Energetic electron fluxes oscillated out of phase with the magnetic field strength with no phase shift at any energy. In the absence of any solar wind trigger or phase shift with energy, we interpret the compressional Pc5 pulsations in terms of the mirror mode instability.

Galina Korotova et al.

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Galina Korotova et al.

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Short summary
We used multipoint magnetic field, electric field, plasma and energetic particle observations to study the spatial, temporal, and spectral characteristics of compressional Pc5 pulsations observed deep within the magnetosphere at the end of a strong magnetic storm. We investigated the mode of the waves and their nodal structure. The energetic particles responded directly to the compressional Pc5 pulsations. We interpret the compressional Pc5 waves in terms of drift-mirror instability.
We used multipoint magnetic field, electric field, plasma and energetic particle observations...
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