In situ evidence of the modification of the parallel propagation of EMIC waves by heated He+ ions

Zhigang Yuan, Xiongdong Yu, Dedong Wang, Shiyong Huang, Haimeng Li, Tao Yu, Zheng Qiao, John R. Wygant, Herbert O. Funsten

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14 Scopus citations

Abstract

With observations of the Van Allen Probe B, we report in situ evidence of the modification of the parallel propagating electromagnetic ion cyclotron (EMIC) waves by heated He+ ions. In the outer boundary of the plasmasphere, accompanied with the He+ ion heating, the frequency bands of H+ and He+ for EMIC waves merged into each other, leading to the disappearance of a usual stop band between the gyrofrequency of He+ ions (ΩHe+) and the H+ cutoff frequency (ωH+co) in the cold plasma. Moreover, the dispersion relation for EMIC waves theoretically calculated with the observed plasma parameters also demonstrates that EMIC waves can indeed parallel propagate across ΩHe+. Therefore, the paper provides an in situ evidence of the modification of the parallel propagation of EMIC waves by heated He+ ions.

Original languageEnglish (US)
Pages (from-to)6711-6717
Number of pages7
JournalJournal of Geophysical Research: Space Physics
Volume121
Issue number7
DOIs
StatePublished - Jul 1 2016

Bibliographical note

Funding Information:
The Van Allen Probes data are available at the websites http://www.space.umn.edu/rbspefw-data/, http://emfisis.physics.uiowa.edu/data/index, and http://www.rbsp-ect.lanl.gov/data_pub/. This work is supported by the National Natural Science Foundation of China (41174140, 41374168, and 41521063), Program for New Century Excellent Talents in University (NCET-13-0446), and Keygrant Project of Chinese Ministry of Education (2042015kf0169).

Publisher Copyright:
©2016. American Geophysical Union. All Rights Reserved.

Copyright:
Copyright 2016 Elsevier B.V., All rights reserved.

Keywords

  • EMIC waves
  • He ion heating
  • Van Allen Probes
  • ring current ions
  • stop band

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