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Title: Simultaneous Observations of Electromagnetic Ion Cyclotron (EMIC) Waves and Pitch Angle Scattering During a Van Allen Probes Conjunction

Abstract

On 22 December 2015, the two Van Allen Probes observed two sets of electromagnetic ion cyclotron (EMIC) wave bursts during a close conjunction when both Probe A and Probe B were separated by 0.57 to 0.68 RE. Here, the EMIC waves occurred during an active period in the recovery phase of a coronal mass ejection-driven geomagnetic storm. Both spacecraft observed EMIC wave bursts that had similar spatial structure within a 1–2 min time delay. The EMIC waves occurred outside the plasmasphere, within ΔL ≈ 1–2 of the plasmapause and within a few degrees in magnetic latitude of the equatorial plane. The spatial structure of the EMIC wave bursts may have been related to the proton drift paths outside the plasmasphere and influenced by total magnetic field strength variations associated with solar wind pressure enhancements. The EMIC waves were observed in a narrow L shell region from L ≈ 4.55–5.32 between 10 and 11 magnetic local time (MLT) on the outbound halves of the spacecraft orbits and from L ≈ 4.82–5.51 between 13 and 14 MLT on the inbound halves of the spacecraft orbits. However, Pc1 pulsations were observed on the ground over a broad range of local times. The anisotropymore » of the proton pitch angle distributions was enhanced when the EMIC waves were observed. Although the overall radiation belt response during this storm was dominated by acceleration and transport processes, the EMIC waves produced local pitch angle scattering of 13–15 keV protons and 2.1–2.6 MeV electrons, consistent with calculations of the expected resonant energies.« less

Authors:
ORCiD logo [1]; ORCiD logo [1]; ORCiD logo [1]; ORCiD logo [1]; ORCiD logo [2]; ORCiD logo [3]
+ Show Author Affiliations
  1. Univ. of Iowa, Iowa City, IA (United States)
  2. Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
  3. Southwest Research Institute, San Antonio, TX (United States)
Publication Date:
Research Org.:
Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
Sponsoring Org.:
USDOE National Nuclear Security Administration (NNSA); National Aeronautics and Space Administration (NASA)
OSTI Identifier:
1760619
Report Number(s):
LA-UR-20-28111
Journal ID: ISSN 2169-9380; TRN: US2205764
Grant/Contract Number:  
89233218CNA000001; NNN06AA01C; NAS5-01072
Resource Type:
Accepted Manuscript
Journal Name:
Journal of Geophysical Research. Space Physics
Additional Journal Information:
Journal Volume: 125; Journal Issue: 4; Journal ID: ISSN 2169-9380
Publisher:
American Geophysical Union
Country of Publication:
United States
Language:
English
Subject:
79 ASTRONOMY AND ASTROPHYSICS; Heliospheric and Magnetospheric Physics; EMIC Waves; Plasmapause; Proton Anisotropy; Storm Recovery Phase; Van Allen; Probes; Pitch Angle Scattering

Citation Formats

Sigsbee, Kristine, Kletzing, C. A., Faden, J. B., Jaynes, A. N., Reeves, Geoffrey David, and Jahn, J. ‐M. Simultaneous Observations of Electromagnetic Ion Cyclotron (EMIC) Waves and Pitch Angle Scattering During a Van Allen Probes Conjunction. United States: N. p., 2020. Web. doi:10.1029/2019ja027424.
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Sigsbee, Kristine, Kletzing, C. A., Faden, J. B., Jaynes, A. N., Reeves, Geoffrey David, & Jahn, J. ‐M. Simultaneous Observations of Electromagnetic Ion Cyclotron (EMIC) Waves and Pitch Angle Scattering During a Van Allen Probes Conjunction. United States. https://doi.org/10.1029/2019ja027424
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Sigsbee, Kristine, Kletzing, C. A., Faden, J. B., Jaynes, A. N., Reeves, Geoffrey David, and Jahn, J. ‐M. Sat . "Simultaneous Observations of Electromagnetic Ion Cyclotron (EMIC) Waves and Pitch Angle Scattering During a Van Allen Probes Conjunction". United States. https://doi.org/10.1029/2019ja027424. https://www.osti.gov/servlets/purl/1760619.
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@article{osti_1760619,
title = {Simultaneous Observations of Electromagnetic Ion Cyclotron (EMIC) Waves and Pitch Angle Scattering During a Van Allen Probes Conjunction},
author = {Sigsbee, Kristine and Kletzing, C. A. and Faden, J. B. and Jaynes, A. N. and Reeves, Geoffrey David and Jahn, J. ‐M.},
abstractNote = {On 22 December 2015, the two Van Allen Probes observed two sets of electromagnetic ion cyclotron (EMIC) wave bursts during a close conjunction when both Probe A and Probe B were separated by 0.57 to 0.68 RE. Here, the EMIC waves occurred during an active period in the recovery phase of a coronal mass ejection-driven geomagnetic storm. Both spacecraft observed EMIC wave bursts that had similar spatial structure within a 1–2 min time delay. The EMIC waves occurred outside the plasmasphere, within ΔL ≈ 1–2 of the plasmapause and within a few degrees in magnetic latitude of the equatorial plane. The spatial structure of the EMIC wave bursts may have been related to the proton drift paths outside the plasmasphere and influenced by total magnetic field strength variations associated with solar wind pressure enhancements. The EMIC waves were observed in a narrow L shell region from L ≈ 4.55–5.32 between 10 and 11 magnetic local time (MLT) on the outbound halves of the spacecraft orbits and from L ≈ 4.82–5.51 between 13 and 14 MLT on the inbound halves of the spacecraft orbits. However, Pc1 pulsations were observed on the ground over a broad range of local times. The anisotropy of the proton pitch angle distributions was enhanced when the EMIC waves were observed. Although the overall radiation belt response during this storm was dominated by acceleration and transport processes, the EMIC waves produced local pitch angle scattering of 13–15 keV protons and 2.1–2.6 MeV electrons, consistent with calculations of the expected resonant energies.},
doi = {10.1029/2019ja027424},
journal = {Journal of Geophysical Research. Space Physics},
number = 4,
volume = 125,
place = {United States},
year = {Sat Apr 04 00:00:00 EDT 2020},
month = {Sat Apr 04 00:00:00 EDT 2020}
}
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