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Title: Ion Injection Triggered EMIC Waves in the Earth's Magnetosphere

Abstract

We present Van Allen Probe observations of electromagnetic ion cyclotron (EMIC) waves triggered solely due to individual substorm-injected ions in the absence of storms or compressions of the magnetosphere during 9 August 2015. The time at which the injected ions are observed directly corresponds to the onset of EMIC waves at the location of Van Allen Probe A (L = 5.5 and 18:06 magnetic local time). The injection was also seen at geosynchronous orbit by the Geostationary Operational Environmental Satellite and Los Alamos National Laboratory spacecraft, and the westward(eastward) drift of ions(electrons) was monitored by Los Alamos National Laboratory spacecraft at different local times. The azimuthal location of the injection was determined by tracing the injection signatures backward in time to their origin assuming a dipolar magnetic field of Earth. The center of this injection location was determined to be close to ~20:00 magnetic local time. Geostationary Operational Environmental Satellite and ground magnetometer responses confirm substorm onset at approximately the same local time. The observed EMIC wave onsets at Van Allen Probe were also associated with a magnetic field decrease. The arrival of anisotropic ions along with the decrease in the magnetic field favors the growth of the EMIC wavemore » instability based on linear theory analysis.« less

Authors:
ORCiD logo [1]; ORCiD logo [2]; ORCiD logo [3]; ORCiD logo [4]; ORCiD logo [5]; ORCiD logo [6]; ORCiD logo [7]; ORCiD logo [8]; ORCiD logo [7]
  1. Indian Inst. of Geomagnetism, Navi, Mumbai (India); NASA Goddard Space Flight Center (GSFC), Greenbelt, MD (United States); Catholic Univ. of America, Washington DC (United States)
  2. NASA Goddard Space Flight Center (GSFC), Greenbelt, MD (United States)
  3. Aerospace Corporation, Chantilly (United States). Space Sciences Dept.
  4. NASA Goddard Space Flight Center (GSFC), Greenbelt, MD (United States); Univ. of Maryland, College Park, MD (United States). Dept. of Astronomy
  5. Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
  6. National Oceanic and Atmospheric Administration (NOAA), Boulder, CO (United States). Space Weather Prediction Center
  7. Univ. of Minnesota, Minneapolis, MN (United States). School of Physics and Astronomy
  8. NASA Goddard Space Flight Center (GSFC), Greenbelt, MD (United States); Catholic Univ. of America, Washington DC (United States)
Publication Date:
Research Org.:
Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
Sponsoring Org.:
National Aeronautics and Space Administration (NASA); USDOE
OSTI Identifier:
1485391
Report Number(s):
LA-UR-18-25089
Journal ID: ISSN 2169-9380
Grant/Contract Number:  
89233218CNA000001; JHU/APL NAS5-01072
Resource Type:
Accepted Manuscript
Journal Name:
Journal of Geophysical Research. Space Physics
Additional Journal Information:
Journal Volume: 123; Journal Issue: 6; Journal ID: ISSN 2169-9380
Publisher:
American Geophysical Union
Country of Publication:
United States
Language:
English
Subject:
58 GEOSCIENCES; Heliospheric and Magnetospheric Physics; substorm; EMIC waves; magnetic dip; ion injections; Van Allen Probes

Citation Formats

Remya, B., Sibeck, D. G., Halford, A. J., Murphy, K. R., Reeves, G. D., Singer, H. J., Wygant, J. R., Farinas Perez, G., and Thaller, S. A. Ion Injection Triggered EMIC Waves in the Earth's Magnetosphere. United States: N. p., 2018. Web. doi:10.1029/2018JA025354.
Remya, B., Sibeck, D. G., Halford, A. J., Murphy, K. R., Reeves, G. D., Singer, H. J., Wygant, J. R., Farinas Perez, G., & Thaller, S. A. Ion Injection Triggered EMIC Waves in the Earth's Magnetosphere. United States. doi:10.1029/2018JA025354.
Remya, B., Sibeck, D. G., Halford, A. J., Murphy, K. R., Reeves, G. D., Singer, H. J., Wygant, J. R., Farinas Perez, G., and Thaller, S. A. Fri . "Ion Injection Triggered EMIC Waves in the Earth's Magnetosphere". United States. doi:10.1029/2018JA025354. https://www.osti.gov/servlets/purl/1485391.
@article{osti_1485391,
title = {Ion Injection Triggered EMIC Waves in the Earth's Magnetosphere},
author = {Remya, B. and Sibeck, D. G. and Halford, A. J. and Murphy, K. R. and Reeves, G. D. and Singer, H. J. and Wygant, J. R. and Farinas Perez, G. and Thaller, S. A.},
abstractNote = {We present Van Allen Probe observations of electromagnetic ion cyclotron (EMIC) waves triggered solely due to individual substorm-injected ions in the absence of storms or compressions of the magnetosphere during 9 August 2015. The time at which the injected ions are observed directly corresponds to the onset of EMIC waves at the location of Van Allen Probe A (L = 5.5 and 18:06 magnetic local time). The injection was also seen at geosynchronous orbit by the Geostationary Operational Environmental Satellite and Los Alamos National Laboratory spacecraft, and the westward(eastward) drift of ions(electrons) was monitored by Los Alamos National Laboratory spacecraft at different local times. The azimuthal location of the injection was determined by tracing the injection signatures backward in time to their origin assuming a dipolar magnetic field of Earth. The center of this injection location was determined to be close to ~20:00 magnetic local time. Geostationary Operational Environmental Satellite and ground magnetometer responses confirm substorm onset at approximately the same local time. The observed EMIC wave onsets at Van Allen Probe were also associated with a magnetic field decrease. The arrival of anisotropic ions along with the decrease in the magnetic field favors the growth of the EMIC wave instability based on linear theory analysis.},
doi = {10.1029/2018JA025354},
journal = {Journal of Geophysical Research. Space Physics},
number = 6,
volume = 123,
place = {United States},
year = {2018},
month = {6}
}

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