Observations directly linking relativistic electron microbursts to whistler mode chorus: Van Allen Probes and FIREBIRD II

0493179 - ÚFA 2019 US eng A - Abstrakt
Breneman, A. W. - Crew, A. - Klumpar, D. - Johnson, A. - Agapitov, O. V. - Shumko, M. - Turner, D. L. - Santolík, Ondřej - Wygant, J. R. - Cattell, C. A. - Thaller, S. A. - Blake, J. B. - Spence, H. - Kletzing, C. - Sample, J.
Observations directly linking relativistic electron microbursts to whistler mode chorus: Van Allen Probes and FIREBIRD II.
AGU Chapman Conference on Particle Dynamics in the Earth’s Radiation Belts. Washington: American Geophysical Union, 2018.
[AGU Chapman Conference on Particle Dynamics in the Earth’s Radiation Belts. 04.03.2018-09.03.2018, Cascais]
Institucionální podpora: RVO:68378289
Klíčová slova: whistler mode chorus * Van Allen Probes * electron microbursts * FIREBIRD II CubeSat
Obor OECD: Fluids and plasma physics (including surface physics)
https://agu.confex.com/agu/18chapman2/webprogram/Paper329649.html

We present observations that provide the strongest evidence yet that discrete whistler mode chorus packets cause relativistic electron microbursts. On Jan 20th, 2016 near 1944 UT the low Earth orbiting CubeSat 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 ~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.
Trvalý link: http://hdl.handle.net/11104/0286591