Discovery of very large amplitude whistler-mode waves in Earth's radiation belts

被引：243

作者：

Cattell, C. ^{[1
]}

Wygant, J. R. ^{[1
]}

Goetz, K. ^{[1
]}

Kersten, K. ^{[1
]}

Kellogg, P. J. ^{[1
]}

von Rosenvinge, T. ^{[2
]}

Bale, S. D. ^{[3
,4
]}

Roth, I. ^{[3
]}

Temerin, M. ^{[3
]}

Hudson, M. K. ^{[5
]}

Mewaldt, R. A. ^{[6
]}

Wiedenbeck, M. ^{[7
]}

Maksimovic, M. ^{[8
]}

Ergun, R. ^{[9
]}

Acuna, M. ^{[2
]}

Russell, C. T. ^{[10
]}

机构：

[1] Univ Minnesota, Sch Phys & Astron, Minneapolis, MN 55455 USA

[2] NASA, Goddard Space Flight Ctr, Greenbelt, MD 20771 USA

[3] Univ Calif Berkeley, Space Sci Lab, Berkeley, CA 94720 USA

[4] Univ Calif Berkeley, Dept Phys, Berkeley, CA 94720 USA

[5] Dartmouth Coll, Dept Phys, Hanover, NH 03755 USA

[6] CALTECH, Downs Lab, Pasadena, CA 91125 USA

[7] CALTECH, Jet Prop Lab, Pasadena, CA 91109 USA

[8] Observ Paris, Lab Etud Spatiales & Instrument & Astrophys, F-92195 Meudon, France

[9] Univ Colorado, Lab Atmospher & Space Phys, Boulder, CO 80303 USA

[10] Univ Calif Los Angeles, Inst Geophys & Planetary Phys, Los Angeles, CA 90024 USA

来源：

GEOPHYSICAL RESEARCH LETTERS | 2008年 / 35卷 / 01期

关键词：

D O I：

10.1029/2007GL032009

中图分类号：

P [天文学、地球科学];

学科分类号：

07 ;

摘要：

During a passage through the Earth's dawn-side outer radiation belt, whistler-mode waves with amplitudes up to more than similar to 240 mV/m were observed by the STEREO S/WAVES instrument. These waves are an order of magnitude larger than previously observed for whistlers in the radiation belt. Although the peak frequency is similar to whistler chorus, there are distinct differences from chorus, in addition to the larger amplitudes, including the lack of drift in frequency and the oblique propagation with a large longitudinal electric field component. Simulations show that these large amplitude waves can energize an electron by the order of an MeV in less than 0.1s, explaining the rapid enhancement in electron intensities observed between the STEREO-B and STEREO-A passage during this event. Our results show that the usual theoretical models of electron energization and scattering via small-amplitude waves, with timescales of hours to days, may be inadequate for understanding radiation belt dynamics.

引用

页数：7

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