Japan Geoscience Union Meeting 2015

Presentation information

International Session (Oral)

Symbol P (Space and Planetary Sciences) » P-EM Solar-Terrestrial Sciences, Space Electromagnetism & Space Environment

[P-EM08] Progress in Physics of the Inner Magnetosphere

Wed. May 27, 2015 9:00 AM - 10:45 AM 302 (3F)

Convener:*Danny Summers(Dept of Math and Stats,Memorial University of Newfoundland), Yusuke Ebihara(Research Institute for Sustainable Humanosphere, Kyoto University), Yoshizumi Miyoshi(Solar-Terrestrial Environement Laboratory, Nagoya University), Chair:Yoshizumi Miyoshi(Solar-Terrestrial Environement Laboratory, Nagoya University)

10:30 AM - 10:45 AM

[PEM08-18] Fine structure of plasmaspheric hiss

*Danny SUMMERS1, Yoshiharu OMURA2, Satoko NAKAMURA2, Craig A. KLETZING3 (1.Memorial University of Nfld,Canada, 2.Kyoto University,Japan, 3.University of Iowa,USA)

Keywords:plasmaspheric hiss, Van Allen Probes, EMFISIS

Plasmaspheric hiss has been widely regarded as a broadband, structureless, incoherent emission. By examining burst-mode vector waveform data from the EMFISIS instrument on the Van Allen Probes mission,we show that plasmaspheric hiss is a coherent emission with complex fine structure. Specifically, plasmaspheric hiss appears as discrete rising tone and falling tone elements.
Our study comprises the analysis of two 1 hour samples,within which a total of eight 1 second samples were analyzed. By means of waveform analysis on two samples,we identify typical amplitudes ,phase profiles, and sweep rates of the rising and falling tone elements. The new observations reported here can be expected to fuel a reexamination of the properties of plasmaspheric hiss,including a further reanalysis of the generation mechanism for hiss.