Journal article
Van Allen Probes observations linking radiation belt electrons to chorus waves during 2014 multiple storms
Journal of geophysical research. Space physics, Vol.120(2), pp.938-948
02/2015
DOI: 10.1002/2014JA020781
Abstract
During 18 February to 2 March 2014, the Van Allen Probes encountered multiple geomagnetic storms and simultaneously observed intensified chorus and hiss waves. During this period, there were substantial enhancements in fluxes of energetic (53.8–108.3 keV) and relativistic (2–3.6 MeV) electrons. Chorus waves were excited at locations L = 4–6.2 after the fluxes of energetic were greatly enhanced, with a lower frequency band and wave amplitudes ∼20–100 pT. Strong hiss waves occurred primarily in the main phases or below the location L = 4 in the recovery phases. Relativistic electron fluxes decreased in the main phases due to the adiabatic (e.g., the magnetopause shadowing) or nonadiabatic (hiss‐induced scattering) processes. In the recovery phases, relativistic electron fluxes either increased in the presence of enhanced chorus or remained unchanged in the absence of strong chorus or hiss. The observed relativistic electron phase space density peaked around L∗ = 4.5, characteristic of local acceleration. This multiple‐storm period reveals a typical picture that chorus waves are excited by the energetic electrons at first and then produce efficient acceleration of relativistic electrons. This further demonstrates that the interplay between both competing mechanisms of chorus‐driven acceleration and hiss‐driven scattering often occurs in the outer radiation belts.
Key Points
Multiple storm period data of chorus wave and electrons
Excited chorus is related to flux rise of energetic electrons
Relativistic electron flux variation is associated with chorus or hiss
Details
- Title: Subtitle
- Van Allen Probes observations linking radiation belt electrons to chorus waves during 2014 multiple storms
- Creators
- Si Liu - Changsha University of Science and TechnologyC. A Kletzing - University of IowaFuliang Xiao - Changsha University of Science and TechnologyW. S Kurth - University of IowaChang Yang - Changsha University of Science and TechnologyG. B Hospodarsky - University of IowaYihua He - Changsha University of Science and TechnologyQinghua Zhou - Changsha University of Science and TechnologyH. E Spence - University of New HampshireG. D Reeves - Los Alamos National LaboratoryH. O Funsten - Los Alamos National LaboratoryJ. B Blake - The Aerospace CorporationD. N Baker - University of Colorado BoulderJ. R Wygant - University of Minnesota
- Resource Type
- Journal article
- Publication Details
- Journal of geophysical research. Space physics, Vol.120(2), pp.938-948
- DOI
- 10.1002/2014JA020781
- ISSN
- 2169-9380
- eISSN
- 2169-9402
- Number of pages
- 11
- Grant note
- Construct Program of the Key Discipline in Hunan Province Aid Program for Science and Technology Innovative Research Team in Higher Educational Institutions of Hunan Province JHU/APL (921647; 967399) National Natural Science Foundation of China (41274165; 41404130; 41204114) NASA Prime (NAS5‐01072) 973 Program (2012CB825603)
- Language
- English
- Date published
- 02/2015
- Academic Unit
- Physics and Astronomy
- Record Identifier
- 9984199759902771
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