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Title: EMIC waves and associated relativistic electron precipitation on 25-26 January 2013

Journal Article · · Journal of Geophysical Research. Space Physics
ORCiD logo [1]; ORCiD logo [2];  [1]; ORCiD logo [1]; ORCiD logo [1]; ORCiD logo [3]; ORCiD logo [3]; ORCiD logo [4]; ORCiD logo [1]; ORCiD logo [1]; ORCiD logo [5]; ORCiD logo [5]; ORCiD logo [6];  [6]; ORCiD logo [7]
  1. Univ. of New Hampshire, Durham, NH (United States). Space Science Center and Dept. of Physics
  2. Dartmouth College, Hanover, NH (United States). Dept. of Physics and Astronomy; NASA Goddard Space Flight Center (GSFC), Greenbelt, MD (United States)
  3. Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
  4. Dartmouth College, Hanover, NH (United States). Dept. of Physics and Astronomy
  5. Univ. of Iowa, Iowa City, IA (United States). Dept. of Physics and Astronomy
  6. Aerospace Corporation, Los Angeles, CA (United States). Space Sciences Dept.
  7. Univ. of Colorado, Boulder, CO (United States). Lab. for Atmospheric and Space Physics

Using measurements from the Van Allen Probes and the Balloon Array for RBSP Relativistic Electron Losses (BARREL), we perform a case study of electromagnetic ion cyclotron (EMIC) waves and associated relativistic electron precipitation (REP) observed on 25–26 January 2013. Among all the EMIC wave and REP events from the two missions, the pair of the events is the closest both in space and time. The Van Allen Probe-B detected significant EMIC waves at L = 2.1–3.9 and magnetic local time (MLT) = 21.0–23.4 for 53.5 min from 2353:00 UT, 25 January 2013. Meanwhile, BARREL-1T observed clear precipitation of relativistic electrons at L = 4.2–4.3 and MLT = 20.7–20.8 for 10.0 min from 2358 UT, 25 January 2013. Local plasma and field conditions for the excitation of the EMIC waves, wave properties, electron minimum resonant energy Emin, and electron pitch angle diffusion coefficient Dαα of a sample EMIC wave packet are examined along with solar wind plasma and interplanetary magnetic field parameters, geomagnetic activity, and results from the spectral analysis of the BARREL balloon observations to investigate the two types of events. The events occurred in the early main phase of a moderate storm (min. Dst* = -51.0 nT). The EMIC wave event consists of two parts. Finally, unlike the first part, the second part of the EMIC wave event was locally generated and still in its source region. It is found that the REP event is likely associated with the EMIC wave event.

Research Organization:
Los Alamos National Laboratory (LANL), Los Alamos, NM (United States)
Sponsoring Organization:
National Aeronautic and Space Administration (NASA); USDOE
Grant/Contract Number:
AC52-06NA25396
OSTI ID:
1402609
Report Number(s):
LA-UR--16-23133
Journal Information:
Journal of Geophysical Research. Space Physics, Journal Name: Journal of Geophysical Research. Space Physics Journal Issue: 11 Vol. 121; ISSN 2169-9380
Publisher:
American Geophysical UnionCopyright Statement
Country of Publication:
United States
Language:
English

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Rapid Loss of Radiation Belt Relativistic Electrons by EMIC Waves journal October 2017
A Statistical Survey of Radiation Belt Dropouts Observed by Van Allen Probes journal August 2018
Temporal and Spatial Correspondence of Pc1/EMIC Waves and Relativistic Electron Precipitations Observed With Ground‐Based Multi‐Instruments on 27 March 2017 journal December 2018
Precipitation of Radiation Belt Electrons by EMIC Waves With Conjugated Observations of NOAA and Van Allen Satellites journal December 2018
Pitch Angle Scattering of Sub‐MeV Relativistic Electrons by Electromagnetic Ion Cyclotron Waves journal July 2019
On the Contribution of EMIC Waves to the Reconfiguration of the Relativistic Electron Butterfly Pitch Angle Distribution Shape on 2014 September 12—A Case Study journal February 2019