[IGPP Everyone] Reminder Today - Space Physics Seminar-Spring Quarter 2018-Friday 5/4/18- 3:30pm Geology 6704
Marjorie Sowmendran
margie at igpp.ucla.edu
Fri May 4 08:45:08 PDT 2018
REMINDER
Today – Friday May 4, 2018
SPACE PHYSICS SEMINAR
DEPARTMENT OF EARTH, PLANETARY, AND SPACE SCIENCES
DEPARTMENT OF ATMOSPHERIC AND OCEANIC SCIENCES
UNIVERSITY OF CALIFORNIA, LOS ANGELES
(AOS M275C, EPSS M288C)
Whistler Mode Waves Modulation of Langmuir Waves in the Radiation Belts and Magnetopause
Jinxing Li
Department of Atmospheric & Oceanic Sciences
University of California, Los Angeles
Abstract
Using high-resolution waveforms measured by the Van Allen Probes and MMS spacecraft, we report a novel observation that occurs both in the radiation belts and the dayside magnetopause. Namely, whistler mode waves modulate electrostatic Langmuir wave bursts. In the radiation belts, the modulation of these two wave modes occur over two time scales: rising-tone time scale and chorus phase period time scale. At the magnetopause region, the modulation occurs on whistler mode phase period time scale. The periodic Langmuir wave bursts are generally observed at the phase location where the whistler mode wave E|| component is oriented opposite to its propagation direction. The electron phase space density measurements show a beam at the velocity that matches the parallel phase velocity of the whistler mode waves. Based on this evidence, we conclude that the whistler mode waves accelerate the suprathermal electrons via Landau resonance, and generate a localized periodic electron beam in phase space density. The Langmuir waves are subsequently excited and modulated by the whistler mode wave phase. This microscale interaction provides a new insight into the nonlinear wave-particle interaction and the energy conversion processes occurred both in the radiation belts and in the reconnection regions.
Friday, May 4, 2018
Room 6704 Geology
3:30 - 5:00 PM
In-Charge: C. T. Russell
Presiding: Yingjuan Ma
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