Excitation of EMIC waves detected by the Van Allen Probes on 28 April 2013. Issue 12 (27th June 2014)

• Record Type: Journal Article
• Authors: Zhang, J.‐C.; Saikin, A. A.; Kistler, L. M.; Smith, C. W.; Spence, H. E.; Mouikis, C. G.; Torbert, R. B.; Larsen, B. A.; Reeves, G. D.; Skoug, R. M.; Funsten, H. O.; Kurth, W. S.; Kletzing, C. A.; Allen, R. C.; Jordanova, V. K.
• Is Part Of: Geophysical research letters. Volume 41:Issue 12(2014:Jun.)
• Page Start: 4101
• Page End: 4108
• Publication Date: 2014-06-27
• Subjects: Geophysics -- Periodicals; Planets -- Periodicals; Lunar geology -- Periodicals; 550
• DOI: 10.1002/2014GL060621
• Languages: English
• ISSNs: 0094-8276

Abstract

<abstract abstract-type="main"> <title>Abstract</title> <p>We report the wave observations, associated plasma measurements, and linear theory testing of electromagnetic ion cyclotron (EMIC) wave events observed by the Van Allen Probes on 28 April 2013. The wave events are detected in their generation regions as three individual events in two consecutive orbits of Van Allen Probe‐A, while the other spacecraft, B, does not detect any significant EMIC wave activity during this period. Three overlapping H⁺ populations are observed around the plasmapause when the waves are excited. The difference between the observational EMIC wave growth parameter (<italic>Σ_h</italic>) and the theoretical EMIC instability parameter (<italic>S_h</italic>) is significantly raised, on average, to 0.10 ± 0.01, 0.15 ± 0.02, and 0.07 ± 0.02 during the three wave events, respectively. On Van Allen Probe‐B, this difference never exceeds 0. Compared to linear theory (<italic>Σ_h</italic> &gt; <italic>S_h</italic>), the waves are only excited for elevated thresholds.</p> </abstract>