[IGPP Everyone] TOMORROW: Space Physics Seminar, Fri. 2/8, 3:30pm: "Statistical characteristics of EMIC waves in the inner magnetosphere under different geomagnetic environments" (C.-W.. Jun, UCLA AOS)

[Emmanuel V. Masongsong]

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) 

Statistical characteristics of EMIC waves in the inner magnetosphere under different geomagnetic environments 

Chae-Woo Jun 
UCLA AOS 

Electromagnetic ion cyclotron (EMIC) waves are observed in the magnetosphere and in the ionosphere with a frequency range of 0.2-5 Hz. EMIC wave-particle interactions have been considered as a significant loss process of ring current particles through pitch-angle scattering. Thus, understanding the generation of EMIC waves is important to study the radiation belt’s dynamics. In this talk, we present our recent reports of EMIC waves in the inner magnetosphere under the different geomagnetic environments (e.g., inside or outside the plasmasphere, and EMIC waves associated with or without energetic particle injections) using the Van Allen Probes and Geostationary Operational Environmental Satellites. He+ EMIC waves associated with injection are usually accompanied by an increase in energetic H+ fluxes (E~0.1-50 keV) with intense wave power at 14-16 MLT inside the plasmasphere. They were predominantly observed with left-hand polarization and higher wave normal angles. On the other hand, H+ EMIC waves were predominantly observed outside the plasmasphere on the dayside, and showed a mixture of left-hand and linear polarizations with lower wave normal angles regardless of injections. More than half of the events outside the plasmasphere showed no H+ flux enhancement at energies of 0.1-50 keV, but they were accompanied by a solar wind dynamic pressure enhancement (ΔPsw=0.5 nPa). Based on these observations, we discuss that possible generation processes of EMIC waves under different geomagnetic environments in the inner magnetosphere. 

Friday, February 8 , 2019 
Room 6704 Geology 
3:30 - 5:00 PM 

In Charge: 
V. Angelopoulos 

-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.igpp.ucla.edu/pipermail/everyone/attachments/20190207/c4a6bee5/attachment.html>