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Statistical investigation of the efficiency of EMIC waves in precipitating relativistic electrons


AuthorQin, Murong; Hudson, Mary; Millan, Mary; Woodger, Leslie; Shekhar, Sapna;
Keywordscausally related; coincidence occurrence rate; efficiency; EMIC wave; random coincidence occurrence rate; relativistic electron precipitation; Van Allen Probes
AbstractElectromagnetic ion cyclotron (EMIC) waves have been proposed to cause Relativistic Electron Precipitation (REP). In our study, we carry out 4 years of analysis from 2013 to 2016, with relativistic electron precipitation spikes obtained from POES satellites and EMIC waves observation from Van Allen Probes. Among the 473 coincidence events when POES satellites go through the region conjugate to EMIC wave activity, only 127 are associated with REP. Additionally, the coincidence occurrence rate is about 10\% higher than the random coincidence occurrence rate, indicating that EMIC waves and relativistic electrons can be statistically related, but the link is weaker than expected. H+ band EMIC waves have been regarded as less important than He+ band EMIC waves for the precipitation of relativistic electrons. We demonstrate that the proportion of H+ band EMIC wave events that are associated with REP (22\% to 32\%) is slightly higher than for He+ band EMIC wave activity (18\% to 27\%). An even greater proportion (25\% to 40\%) of EMIC waves are accompanied by REP events when H+ band and He+ band EMIC waves occur simultaneously.
Year of Publication2018
JournalJournal of Geophysical Research: Space Physics
Volume
Number of Pages
Section
Date Published06/2018
ISBN
URLhttps://agupubs.onlinelibrary.wiley.com/doi/10.1029/2018JA025419
DOI10.1029/2018JA025419