A case study of electron precipitation fluxes due to plasmaspheric hiss

0450911 - ÚFA 2016 RIV US eng J - Journal Article
Hardman, R. - Clilverd, M. A. - Rodger, C. J. - Brundell, J. B. - Duthie, R. - Holzworth, R. H. - Mann, I. R. - Milling, D. K. - Macúšová, Eva
A case study of electron precipitation fluxes due to plasmaspheric hiss.
Journal of Geophysical Research-Space Physics. Roč. 120, č. 8 (2015), s. 6736-6748. ISSN 2169-9380. E-ISSN 2169-9402
Institutional support: RVO:68378289
Keywords : plasmasphere * plasmaspheric hiss * electron precipitation * radiation belt electrons
Subject RIV: BL - Plasma and Gas Discharge Physics
Impact factor: 3.318, year: 2015
http://onlinelibrary.wiley.com/doi/10.1002/2015JA021429/abstract

We find that during a large geomagnetic storm in October 2011 the trapped fluxes of >30, >100, and >300 keV outer radiation belt electrons were enhanced at L = 3-4 during the storm main phase. Agradual decay of the trapped fluxes was observed over the following 5-7 days, even though no significant precipitation fluxes could be observed in the Polar Orbiting Environmental Satellite (POES)electron precipitation detectors. We use the Antarctic-Arctic Radiation-belt (Dynamic) Deposition-VLF Atmospheric Research Konsortium receiver network to investigate the characteristics of the electronprecipitation throughout the storm period. Weak electron precipitation was observed on the dayside for 5-7 days, consistent with being driven by plasmaspheric hiss. Using a previously publishedplasmaspheric hiss-induced electron energy e-folding spectrum of E0 = 365 keV, the observed radio wave perturbation levels at L = 3-4 were found to be caused by >30 keV electron precipitation withflux ~100 el cm-2 s-1 sr-1. The low levels of precipitation explain the lack of response of the POES telescopes to the flux, because of the effect of the POES lower sensitivity limit and ability to measure weak diffusion-driven precipitation.
Permanent Link: http://hdl.handle.net/11104/0252097