Electron precipitation from EMIC waves: A case study from 31
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TitleElectron precipitation from EMIC waves: A case study from 31 May 2013AbstractOn 31 May 2013 several rising tone electromagnetic ion cyclotron (EMIC) waves with intervals of pulsations of diminishing periods were observed in the magnetic local time afternoon and evening sectors during the onset of a moderate/large geomagnetic storm. The waves were sequentially observed in Finland, Antarctica, and western Canada. Coincident electron precipitation by a network of ground-based Antarctic Arctic Radiation-belt Dynamic Deposition VLF Atmospheric Research Konsortia and riometer instruments, as well as the Polar-orbiting Operational Environmental Satellite (POES) electron telescopes, was also observed. At the same time, POES detected 30-80-keV proton precipitation drifting westward at locations that were consistent with the ground-based observations, indicating substorm injection. Through detailed modeling of the combination of ground and satellite observations, the characteristics of the EMIC-induced electron precipitation were identified as latitudinal width of 2-3^circ or Î"L-=-1-Re , longitudinal width  50^circ or 3-h magnetic local time, lower cutoff energy 280-keV, typical flux 1-×-104-el-cm-2-sr-1-s-1->-300-keV. The lower cutoff energy of the most clearly defined EMIC rising tone in this study confirms the identification of a class of EMIC-induced precipitation events with unexpectedly low-energy cutoffs of <400-keV. Key Points EMIC induced electron precipitation with latitudinal width of 2-3^circ EMIC induced electron precipitation with lower cutoff energy of 280-keV Oxygen band EMIC induced electron precipitation driven by substorm â"'2015. American Geophysical Union. All Rights Reserved.AcknowledgementsThe authors would like to thank Bergur Helgi and Jon Bjorn Richardsson for their assistance and enthusiasm during the data collection in Iceland. Data for this paper are available at the British Antarctic Survey Polar Data Centre (http://psddb.nerc-bas.ac.uk/data/access/). M.A.C. would like to acknowledge support from the Natural Environmental Research Council grant NE/J008125/1. A.H., R.D., and R.H. received funding from the European CommunityÅ› Seventh Framework Programme ([FP7/2007-2013]) under grant agreement number 263218. CARISMA is operated by the University of Alberta and funded by the Canadian Space Agency. Support for the Halley search coil magnetometer was provided by U.S. National Science Foundation grants PLR-1341493 to Augsburg College and PLR-1341677 to the University of New Hampshire. Michael Balikhin thanks the reviewers for their assistance in evaluating this paper.
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1st AuthorClilverd, M.AuthorClilverd, M.Duthie, R.Hardman, R.Hendry, A.Rodger, C.Raita, T.Engebretson, M.Lessard, M.Danskin, D.Milling, D.Year2015JournalJournal of Geophysical Research A: Space PhysicsVolume120Number5Pages3618-3631DOI10.1002/2015JA021090URLhttps://www.scopus.com/inward/recor.....1ab0a66cc56be4403299fa7d7Keywordsrank3Author Keywordselectromagnetic ion cyclotronelectron precipitationradio propagationsatelliteProgrammeK060 - AARDDVARK - Long Range Environmental Monitoring by Radio
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TypeArticleCitationClilverd, M., Duthie, R., Hardman, R., Hendry, A., Rodger, C., Raita, T., Engebretson, M., Lessard, M., Danskin, D. and Milling, D. (2015). Electron precipitation from EMIC waves: A case study from 31 May 2013. Journal of Geophysical Research A: Space Physics, 120(5): 3618-3631 IdentifierClilverd2015Relevancerank3
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Milling, D., Electron precipitation from EMIC waves: A case study from 31 , [Clilverd2015]. Antarctica NZ, accessed 29/04/2026, https://adam.antarcticanz.govt.nz/nodes/view/63426, 10.1002/2015JA021090