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This content will become publicly available on August 14, 2017

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

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.
 [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)
Publication Date:
OSTI Identifier:
Report Number(s):
Journal ID: ISSN 0094-8276
Grant/Contract Number:
Accepted Manuscript
Journal Name:
Geophysical Research Letters
Additional Journal Information:
Journal Volume: 43; Journal Issue: 15; Journal ID: ISSN 0094-8276
American Geophysical Union
Research Org:
Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
Sponsoring Org:
Country of Publication:
United States
58 GEOSCIENCES heliospheric and magnetospheric physics