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Observations Directly Linking Relativistic Electron Microbursts to Whistler Mode Chorus: Van Allen Probes and FIREBIRD II
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SYSNO ASEP 0487743 Document Type J - Journal Article R&D Document Type Journal Article Subsidiary J Článek ve WOS Title Observations Directly Linking Relativistic Electron Microbursts to Whistler Mode Chorus: Van Allen Probes and FIREBIRD II Author(s) Breneman, A. W. (US)
Crew, A. (US)
Sample, J. (US)
Klumpar, D. (US)
Johnson, A. (US)
Agapitov, O. (FR)
Shumko, M. (US)
Turner, D. L. (US)
Santolík, Ondřej (UFA-U) RID, ORCID
Wygant, J. R. (US)
Cattell, C. A. (US)
Thaller, S. A. (US)
Blake, B. (US)
Spence, H. (US)
Kletzing, C. A. (US)Number of authors 15 Source Title Geophysical Research Letters. - : Wiley - ISSN 0094-8276
Roč. 44, č. 22 (2017), s. 11265-11272Number of pages 8 s. Language eng - English Country US - United States Keywords VLF-CHORUS ; RADIATION BELT ; ZONE ELECTRONS ; SOURCE REGION ; AURORAL-ZONE ; GEM STORMS ; PRECIPITATION ; ASSOCIATION ; RESOLUTION ; EMISSIONS Subject RIV BL - Plasma and Gas Discharge Physics OECD category Fluids and plasma physics (including surface physics) R&D Projects GA17-07027S GA ČR - Czech Science Foundation (CSF) Institutional support UFA-U - RVO:68378289 UT WOS 000419102300006 EID SCOPUS 85036551527 DOI 10.1002/2017GL075001 Annotation We present observations that provide the strongest evidence yet that discrete whistler mode chorus packets cause relativistic electron microbursts. On 20 January 2016 near 1944 UT the low Earth orbiting CubeSat Focused Investigations of Relativistic Electron Bursts: Intensity, Range, and Dynamics (FIREBIRD II) observed energetic microbursts (near L = 5.6 and MLT = 10.5) from its lower limit of 220 keV, to 1 MeV. In the outer radiation belt and magnetically conjugate, Van Allen Probe A observed rising-tone, lower band chorus waves with durations and cadences similar to the microbursts. No other waves were observed. This is the first time that chorus and microbursts have been simultaneously observed with a separation smaller than a chorus packet. A majority of the microbursts do not have the energy dispersion expected for trapped electrons bouncing between mirror points. This confirms that the electrons are rapidly (nonlinearly) scattered into the loss cone by a coherent interaction with the large amplitude (up to similar to 900 pT) chorus. Comparison of observed time-averaged microburst flux and estimated total electron drift shell content at L = 5.6 indicate that microbursts may represent a significant source of energetic electron loss in the outer radiation belt. Workplace Institute of Atmospheric Physics Contact Kateřina Adamovičová, adamovicova@ufa.cas.cz, Tel.: 272 016 012 ; Kateřina Potužníková, kaca@ufa.cas.cz, Tel.: 272 016 019 Year of Publishing 2018
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