Energetic electron precipitation associated with pulsating aurora: EISCAT and Van Allen Probe observations

Miyoshi, Y.; Oyama, S.; Saito, S.; Kurita, S.; Fujiwara, H.; Kataoka, R.; Ebihara, Y.; Kletzing, C.; Reeves, G.; Santolik, O.; Clilverd, M.; Rodger, C. J.; Turunen, E.; Tsuchiya, F.

doi:10.1002/2014JA020690

Energetic electron precipitation associated with pulsating aurora: EISCAT and Van Allen Probe observations

Journal Article · Tue Apr 21 00:00:00 EDT 2015 · Journal of Geophysical Research. Space Physics

DOI:https://doi.org/10.1002/2014JA020690· OSTI ID:1212464

Miyoshi, Y. ^[1]; Oyama, S. ^[1]; Saito, S. ^[2]; Kurita, S. ^[1]; Fujiwara, H. ^[3]; Kataoka, R. ^[4]; Ebihara, Y. ^[5]; Kletzing, C. ^[6]; Reeves, G. ^[7]; Santolik, O. ^[8]; Clilverd, M. ^[9]; Rodger, C. J. ^[10]; Turunen, E. ^[11]; Tsuchiya, F. ^[12]

Nagoya Univ., Nagoya (Japan). Solar-Terrestrial Environment Lab.
Nagoya Univ., Nagoya (Japan). Graduate School of Science.
Seikei Univ., Musashino (Japan). Faculty of Science and Technology.
National Institute of Polar Research, Tachikawa (Japan)
Kyoto Univ., Uji (Japan). Research Institute for Sustainable Humanosphere.
Univ. of Iowa, Iowa City, IA (United States)
Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
Institute of Atmospheric Physics CAS, Prague (Czech Republic). Dept. of Space Physics; Charles Univ. in Prague, Prague (Czech Republic). Faculty of Mathematics and Physics.
British Antarctic Survey, Cambridge (United Kingdom)
Univ. of Otago, Dunedin (New Zealand). Dept. of Physics.
Univ. of Oulu, Oulu (Finland). Sodankyla Geophysical Observatory.
Tohoku Univ., Sendai (Japan). Planetary Plasma and Atmospheric Research Center.

Pulsating auroras show quasi-periodic intensity modulations caused by the precipitation of energetic electrons of the order of tens of keV. It is expected theoretically that not only these electrons but also subrelativistic/relativistic electrons precipitate simultaneously into the ionosphere owing to whistler mode wave-particle interactions. The height-resolved electron density profile was observed with the European Incoherent Scatter (EISCAT) Tromsø VHF radar on 17 November 2012. Electron density enhancements were clearly identified at altitudes >68 km in association with the pulsating aurora, suggesting precipitation of electrons with a broadband energy range from ~10 keV up to at least 200 keV. The riometer and network of subionospheric radio wave observations also showed the energetic electron precipitations during this period. During this period, the footprint of the Van Allen Probe-A satellite was very close to Tromsø and the satellite observed rising tone emissions of the lower band chorus (LBC) waves near the equatorial plane. Considering the observed LBC waves and electrons, we conducted a computer simulation of the wave-particle interactions. This showed simultaneous precipitation of electrons at both tens of keV and a few hundred keV, which is consistent with the energy spectrum estimated by the inversion method using the EISCAT observations. This result revealed that electrons with a wide energy range simultaneously precipitate into the ionosphere in association with the pulsating aurora, providing the evidence that pulsating auroras are caused by whistler chorus waves. We suggest that scattering by propagating whistler simultaneously causes both the precipitations of subrelativistic electrons and the pulsating aurora.

View Accepted Manuscript (DOE)

Research Organization:: Los Alamos National Laboratory (LANL), Los Alamos, NM (United States)

Sponsoring Organization:: USDOE

Grant/Contract Number:: AC52-06NA25396

OSTI ID:: 1212464

Journal Information:: Journal of Geophysical Research. Space Physics, Journal Name: Journal of Geophysical Research. Space Physics Journal Issue: 4 Vol. 120; ISSN 2169-9380

Publisher:: American Geophysical UnionCopyright Statement

Country of Publication:: United States

Language:: English

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