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Annales Geophysicae An interactive open-access journal of the European Geosciences Union
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Volume 36, issue 3 | Copyright
Ann. Geophys., 36, 781-791, 2018
© Author(s) 2018. This work is distributed under
the Creative Commons Attribution 4.0 License.

Regular paper 23 May 2018

Regular paper | 23 May 2018

Van Allen Probes observation of plasmaspheric hiss modulated by injected energetic electrons

Run Shi1, Wen Li1, Qianli Ma2,1, Seth G. Claudepierre3, Craig A. Kletzing4, William S. Kurth4, George B. Hospodarsky4, Harlan E. Spence5, Geoff D. Reeves6, Joseph F. Fennell3, J. Bernard Blake3, Scott A. Thaller7, and John R. Wygant7 Run Shi et al.
  • 1Center for Space Physics, Boston University, Boston, Massachusetts, USA
  • 2Department of Atmospheric and Oceanic Sciences, University of California, Los Angeles, Los Angeles, California, USA
  • 3Space Science Department, The Aerospace Corporation, El Segundo, California, USA
  • 4Department of Physics and Astronomy, University of Iowa, Iowa City, Iowa, USA
  • 5Institute for the Study of Earth, Oceans, and Space, University of New Hampshire, Durham, New Hampshire, USA
  • 6Space Science and Applications Group, Los Alamos National Laboratory, Los Alamos, New Mexico, USA
  • 7School of Physics and Astronomy, University of Minnesota, Twin Cities, Minneapolis, Minnesota, USA

Abstract. Plasmaspheric hiss was observed by Van Allen Probe B in association with energetic electron injections in the outer plasmasphere. The energy of injected electrons coincides with the minimum resonant energy calculated for the observed hiss wave frequency. Interestingly, the variations in hiss wave intensity, electron flux and ultra low frequency (ULF) wave intensity exhibit remarkable correlations, while plasma density is not correlated with any of these parameters. Our study provides direct evidence for the first time that the injected anisotropic electron population, which is modulated by ULF waves, modulates the hiss intensity in the outer plasmasphere. This also implies that the plasmaspheric hiss observed by Van Allen Probe B in the outer plasmasphere (L >  ∼ 5.5) is locally amplified. Meanwhile, Van Allen Probe A observed hiss emission at lower L shells ( < 5), which was not associated with electron injections but primarily modulated by the plasma density. The features observed by Van Allen Probe A suggest that the observed hiss deep inside the plasmasphere may have propagated from higher L shells.

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