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Title: Fast modulations of pulsating proton aurora related to subpacket structures of Pc1 geomagnetic pulsations at subauroral latitudes

Journal Article · · Geophysical Research Letters
DOI:https://doi.org/10.1002/2016GL070008· OSTI ID:1304820
 [1];  [2];  [2];  [3];  [1];  [1];  [4];  [2];  [5];  [6];  [2];  [2];  [7];  [7];  [8]
  1. Kanazawa Univ., Kanazawa (Japan)
  2. Nagoya Univ., Nagoya (Japan)
  3. National Institute of Polar Research, Tachikawa (Japan); Univ. for Advanced Studies (SOKENDAI), Tachikawa (Japan)
  4. Kyoto Univ., Uji (Japan)
  5. Japan Aerospace Exploration Agency, Sagamihara (Japan)
  6. National Institute of Information and Communications Technology, Koganei (Japan)
  7. Athabasca Univ., Athabasca, AB (Canada)
  8. Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
+ Show Author Affiliations

To understand the role of electromagnetic ion cyclotron (EMIC) waves in determining the temporal features of pulsating proton aurora (PPA) via wave-particle interactions at subauroral latitudes, high-time-resolution (1/8 s) images of proton-induced N2>+ emissions were recorded using a new electron multiplying charge-coupled device camera, along with related Pc1 pulsations on the ground. The observed Pc1 pulsations consisted of successive rising-tone elements with a spacing for each element of 100 s and subpacket structures, which manifest as amplitude modulations with a period of a few tens of seconds. In accordance with the temporal features of the Pc1 pulsations, the auroral intensity showed a similar repetition period of 100 s and an unpredicted fast modulation of a few tens of seconds. Furthermore, these results indicate that PPA is generated by pitch angle scattering, nonlinearly interacting with Pc1/EMIC waves at the magnetic equator.

Research Organization:
Los Alamos National Laboratory (LANL), Los Alamos, NM (United States)
Sponsoring Organization:
National Aeronautics and Space Administration (NASA); USDOE
Grant/Contract Number:
AC52-06NA25396
OSTI ID:
1304820
Report Number(s):
LA-UR-16-25492
Journal Information:
Geophysical Research Letters, Vol. 43, Issue 15; ISSN 0094-8276
Publisher:
American Geophysical UnionCopyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 12 works
Citation information provided by
Web of Science

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Cited By (6)

Discovery of 1 Hz Range Modulation of Isolated Proton Aurora at Subauroral Latitudes journal February 2018
Microscopic Observations of Pulsating Aurora Associated With Chorus Element Structures: Coordinated Arase Satellite‐PWING Observations journal November 2018
Direct Comparison Between Magnetospheric Plasma Waves and Polar Mesosphere Winter Echoes in Both Hemispheres journal November 2019
Ground-based instruments of the PWING project to investigate dynamics of the inner magnetosphere at subauroral latitudes as a part of the ERG-ground coordinated observation network journal November 2017
Hybrid-Vlasov modelling of nightside auroral proton precipitation during southward interplanetary magnetic field conditions journal January 2019
Hybrid-Vlasov modelling of nightside auroral proton precipitation during southward interplanetary magnetic field conditions journal April 2019

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Heliospheric and Magnetospheric Physics