Simultaneous disappearances of plasmaspheric hiss, exohiss, and chorus waves triggered by a sudden decrease in solar wind dynamic pressure

Nigang Liu, Zhenpeng Su, Zhonglei Gao, Huinan Zheng, Yuming Wang, Shui Wang, H. E. Spence, G. D. Reeves, D. N. Baker, J. B. Blake, H. O. Funsten, J. R. Wygant

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20 Scopus citations

Abstract

Magnetospheric whistler mode waves are of great importance in the radiation belt electron dynamics. Here on the basis of the analysis of a rare event with the simultaneous disappearances of whistler mode plasmaspheric hiss, exohiss, and chorus triggered by a sudden decrease in the solar wind dynamic pressure, we provide evidences for the following physical scenarios: (1) nonlinear generation of chorus controlled by the geomagnetic field inhomogeneity, (2) origination of plasmaspheric hiss from chorus, and (3) leakage of plasmaspheric hiss into exohiss. Following the reduction of the solar wind dynamic pressure, the dayside geomagnetic field configuration with the enhanced inhomogeneity became unfavorable for the generation of chorus, and the quenching of chorus directly caused the disappearances of plasmaspheric hiss and then exohiss.

Original languageEnglish (US)
Pages (from-to)52-61
Number of pages10
JournalGeophysical Research Letters
Volume44
Issue number1
DOIs
StatePublished - Jan 16 2017

Bibliographical note

Funding Information:
This work was supported by the National Natural Science Foundation of China grants 41631071, 41422405, 41274169, 41274174, 41174125, 41131065, 41421063, 41231066, and 41304134; the Chinese Academy of Sciences grants KZCX2-EW-QN510 and KZZD-EW-01-4; the CAS Key Research Program of Frontier Sciences grant QYZDB-SSW-DQC015; the National Key Basic Research Special Foundation of China grant 2011CB811403; and the Fundamental Research Funds for the Central Universities WK2080000077. We acknowledge J.H. King, N. Papatashvilli, and CDAWeb for the use of interplanetary parameters and magnetospheric indices, acknowledge the University of Iowa as the source for the EMFISIS data (this acknowledgment does not imply endorsement of the publication by the University of Iowa or its researchers), and acknowledge the THEMIS team for the use of SCM, FGM, ESA, SST, and EFI data. The interplanetary parameters and geomagnetic indices are obtained at the CDAWeb (http://cdaweb.gsfc.nasa.gov/cdaweb/istp_public/). The RBSP data are available at the websites http://emfisis.physics.uiowa.edu/Flight/ for EMFISIS, http://www.rbsp-ect.lanl.gov/data_pub/ for ECT, and http://www.space.umn.edu/rbspefw-data/ for EFW. The THEMIS data are available at the website http://themis.ssl.berkeley.edu/data/themis/.

Keywords

  • chorus
  • exohiss
  • plasmaspheric hiss
  • wave disappearance
  • wave generation

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