期刊
JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS
卷 119, 期 11, 页码 9134-9149出版社
AMER GEOPHYSICAL UNION
DOI: 10.1002/2014JA020437
关键词
plasmaspheric hiss; whistler mode waves
资金
- Ministry of Education, Culture, Sports, Science and Technology in Japan [26287120]
- Japan Society for the Promotion of Science
- Natural Sciences and Engineering Research Council of Canada
- Grants-in-Aid for Scientific Research [14J01637, 26287120] Funding Source: KAKEN
Plasmaspheric hiss has been widely regarded as a broadband, structureless, incoherent emission. In this study, by examining burst-mode vector waveform data from the Electric and Magnetic Field Instrument Suite and Integrated Science 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 h samples within which a total of eight 1 s 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 exciting 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.
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