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Title: Resonance of relativistic electrons with electromagnetic ion cyclotron waves

Relativistic electrons have been thought to more easily resonate with electromagnetic ion cyclotron EMIC waves if the total density is large. We show that, for a particular EMIC mode, this dependence is weak due to the dependence of the wave frequency and wave vector on the density. A significant increase in relativistic electron minimum resonant energy might occur for the H band EMIC mode only for small density, but no changes in parameters significantly decrease the minimum resonant energy from a nominal value. The minimum resonant energy depends most strongly on the thermal velocity associated with the field line motion of the hot ring current protons that drive the instability. High density due to a plasmasphere or plasmaspheric plume could possibly lead to lower minimum resonance energy by causing the He band EMIC mode to be dominant. We demonstrate these points using parameters from a ring current simulation.
Authors:
 [1] ;  [2] ;  [3]
  1. Dartmouth College, Hanover, NH (United States)
  2. Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
  3. Univ. of California Los Angeles, Los Angeles CA (United States)
Publication Date:
OSTI Identifier:
1221607
Report Number(s):
LA-UR--15-23279
Journal ID: ISSN 0094-8276
Grant/Contract Number:
NNX10AQ60G; NNX13AD65G; NNX08AM58G; NNH13AW83I; IAA1203460; SC0010578; AC52-06NA25396
Type:
Accepted Manuscript
Journal Name:
Geophysical Research Letters
Additional Journal Information:
Journal Name: Geophysical Research Letters; Journal ID: ISSN 0094-8276
Publisher:
American Geophysical Union
Research Org:
Los Alamos National Laboratory (LANL), Los Alamos, NM (United States)
Sponsoring Org:
USDOE
Country of Publication:
United States
Language:
English
Subject:
58 GEOSCIENCES magnetosphere: inner; plasma waves and instabilities; plasmasphere; radiation belts; wave/particle interactions