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Engebretson, M. J., Posch, J. L., Braun, D. J., Li, W., Ma, Q., Kellerman, A. C., et al. (2018). EMIC wave events during the four GEM QARBM challenge intervals. Journal of Geophysical Research: Space Physics, 123, 6394– 6423.

EMIC wave events during the four GEM QARBM challenge intervals

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Author: Engebretson, M. J.1; Posch, J. L.1; Braun, D. J.1;
Organizations: 1Department of Physics, Augsburg University, Minneapolis, MN, USA
2Center for Space Physics, Boston University, Boston, MA, USA
3Department of Atmospheric and Oceanic Sciences, University of California, Los Angeles, CA, USA
4Institute for the Study of the Earth, Oceans, and Space, University of New Hampshire, Durham, NH, USA
5NASA/Goddard Space Flight Center, Greenbelt, MD, USA
6Department of Physics and Astronomy, University of Iowa, Iowa City, IA, USA
7School of Physics and Astronomy, University of Minnesota, Minneapolis, MN, USA
8Laboratory for Atmospheric and Space Physics, University of Colorado Boulder, Boulder, CO, USA
9The Aerospace Corporation, Los Angeles, CA, USA
10NOAA Space Weather Prediction Center, Boulder, CO, USA
11British Antarctic Survey, Cambridge, UK
12Sodankylä Geophysical Observatory, Sodankylä, Finland
13Institute for Space-Earth Environmental Research, Nagoya University, Nagoya, Japan
14Institute of Solar-Terrestrial Physics, Irkutsk, Russia
15Borok Geophysical Observatory, Borok, Russia
16Radiophysical Research Institute, Lobachevsky State University, Nizhny Novgorod, Russia
Format: article
Version: published version
Access: open
Online Access: PDF Full Text (PDF, 10.7 MB)
Persistent link:
Language: English
Published: American Geophysical Union, 2018
Publish Date: 2019-09-24


This paper presents observations of electromagnetic ion cyclotron (EMIC) waves from multiple data sources during the four Geospace Environment Modeling challenge events in 2013 selected by the Geospace Environment Modeling Quantitative Assessment of Radiation Belt Modeling focus group: 17 and 18 March (stormtime enhancement), 31 May to 2 June (stormtime dropout), 19 and 20 September (nonstorm enhancement), and 23–25 September (nonstorm dropout). Observations include EMIC wave data from the Van Allen Probes, Geostationary Operational Environmental Satellite, and Time History of Events and Macroscale Interactions during Substorms spacecraft in the near‐equatorial magnetosphere and from several arrays of ground‐based search coil magnetometers worldwide, as well as localized ring current proton precipitation data from low‐altitude Polar Operational Environmental Satellite spacecraft. Each of these data sets provides only limited spatial coverage, but their combination shows consistent occurrence patterns and reveals some events that would not be identified as significant using near‐equatorial spacecraft alone. Relativistic and ultrarelativistic electron flux observations, phase space density data, and pitch angle distributions based on data from the Relativistic Electron‐Proton Telescope and Magnetic Electron Ion Spectrometer instruments on the Van Allen Probes during these events show two cases during which EMIC waves are likely to have played an important role in causing major flux dropouts of ultrarelativistic electrons, particularly near L* ~4.0. In three other cases, identifiable smaller and more short‐lived dropouts appeared, and in five other cases, these waves evidently had little or no effect.

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Series: Journal of geophysical research. Space physics
ISSN: 2169-9380
ISSN-E: 2169-9402
ISSN-L: 2169-9380
Volume: 123
Issue: 8
Pages: 6394 - 6423
DOI: 10.1029/2018JA025505
Type of Publication: A1 Journal article – refereed
Field of Science: 115 Astronomy and space science
Funding: Work at Augsburg University was supported by National Science Foundation grants PLR‐1341493, AGS‐1264146, and AGS‐1651263, and work performed by M. J. E. at NASA/GSFC was supported by the Van Allen Probes mission. W. L. acknowledges support from NSF grant AGS‐1723588, AFOSR grant FA9550‐15‐1‐0158, and the Alfred P. Sloan Research Fellowship FG‐2018‐10936. Work performed by Q. M. was supported by the Van Allen Probes Mission via JHU/APL contracts 967399 and 921647. A. C. K. acknowledges support from NASA grant NNS16AG78G and NSF grant AGS‐1552321. M. R. L. acknowledges support from NSF grant PLR‐1341677. Research at the British Antarctic Survey was supported by the Natural Environment Research Council (NERC) Highlight Topic Grant NE/P01738X/1 (Rad/Sat) and National Capability funding grant NE/R016038/1. [...] K. S. is supported by JSPS KAKENHI 15H05815 and 16H06286. E. E. acknowledges support from Russian Foundation for Basic Research grant 18‐05‐00108. Van Allen Probes research at the University of Colorado, the University of Iowa, the University of Minnesota, the University of New Hampshire, UCLA, and the Aerospace Corporation was supported by NASA prime contract NAS5‐01072 to The Johns Hopkins University Applied Physics Laboratory.
Copyright information: © 2018. American Geophysical Union. All Rights Reserved.