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Energetic electron precipitation associated with pulsating aurora: EISCAT and Van Allen Probe observations
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2015 (English)In: Journal of Geophysical Research - Space Physics, ISSN 2169-9380, E-ISSN 2169-9402, Vol. 120, no 4, 2754-2766 p.Article in journal (Refereed) Published
Abstract [en]

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.

Place, publisher, year, edition, pages
2015. Vol. 120, no 4, 2754-2766 p.
Keyword [en]
Auroral phenomena, Energetic particles: precipitating, Plasma waves and instabilities, Numerical modeling, Plasma sheet, pulsating aurora, EISCAT, Van Allen Probes, pitch angle scattering
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Natural Sciences
Identifiers
URN: urn:nbn:se:polar:diva-3569DOI: 10.1002/2014JA020690OAI: oai:DiVA.org:polar-3569DiVA: diva2:1096939
Available from: 2017-05-19 Created: 2017-05-19 Last updated: 2017-05-19

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Publisher's full texthttp://dx.doi.org/10.1002/2014JA020690
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Journal of Geophysical Research - Space Physics
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CiteExportLink to record
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Cite
Citation style
  • apa
  • harvard1
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • Other style
More styles
Language
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Other locale
More languages
Output format
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  • asciidoc
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