Observations of relativistic electron precipitation from the radiation belts driven by EMIC wavesObservations of relativistic electron precipitation from the radiation belts driven by EMIC waves

被引：0

作者：

Department of Physics, University of Otago, P.O. Box 56, Dunedin, New Zealand ^{[1
]}

不详 ^{[2
]}

不详 ^{[3
]}

机构：

[1] Department of Physics, University of Otago, Dunedin

[2] Sodankylä Geophysical Observatory, University of Oulu

[3] Physical Sciences Division, British Antarctic Survey, Cambridge CB3 0ET, High Cross, Madingley Road

来源：

Geophys. Res. Lett. | 2008年 / 16卷

基金：

英国自然环境研究理事会;

关键词：

Radiation belts;

D O I：

10.1029/2008GL034804

中图分类号：

学科分类号：

摘要：

For some time theoretical modeling has shown that electromagnetic ion cyclotron (EMIC) waves should play an important role in the loss of relativistic electrons from the radiation belts, through precipitation into the atmosphere. Up to now there has been limited experimental evidence for relativistic electron precipitation driven by EMIC waves. In this paper we present case studies of events showing EMIC waves, observed by ground-based pulsation magnetometers, which are linked to strong responses in a subionospheric precipitation monitor. This response is consistent with precipitation occurring near the plasmapause, where EMIC waves may resonate with relativistic electrons. At the same time there is only a weak response in a co-located riometer chain, as expected for relativistic electron precipitation that penetrates deeply into the atmosphere. Copyright 2008 by the American Geophysical Union.

引用

共 9 条

[1]

Clilverd M.A., Meredith N.P., Horne R.B., Glauert S.A., Anderson R.R., Thomson N.R., Menk F.W., Sandel B.R., Longitudinal and seasonal variations in plasmaspheric electron density: Implications for electron precipitation, J. Geophys. Res, 112, (2007)

[2]

Erlandson R.E., Mursula K., Bosinger T., Simultaneous ground-satellite observations of structured Pc 1 pulsations, J. Geophys. Res, 101, (1996)

[3]

Engebretson M.J., Et al., Pc1-Pc2 waves and energetic particle precipitation during and after magnetic storms: Superposed epoch analysis and case studies, J. Geophys. Res, 113, (2008)

[4]

Lukkari L., Kangas J., Ranta H., Correlated electron precipitation and magnetic IPDP events near the plasmapause, J. Geophys. Res, 82, pp. 4750-4756, (1977)

[5]

Meredith N.P., Thorne R.M., Horne R.B., Summers D., Fraser B.J., Anderson R.R., Statistical analysis of relativistic electron energies for cyclotron resonance with EMIC waves observed on CRRES, J. Geophys. Res, 108, A6, (2003)

[6]

Millan R.M., Lin R.P., Smith D.M., Lorentzen K.R., McCarthy M.P., X-ray observations of MeV electron precipitation with a balloon-borne germanium spectrometer, Geophys. Res. Lett, 29, 24, (2002)

[7]

Rodger C.J., Clilverd M.A., Thomson N.R., Gamble R.J., Seppala A., Turunen E., Meredith N.P., Parrot M., Sauvaud J.-A., Berthelier J.-J., Radiation belt electron precipitation into the atmosphere: Recovery from a geomagnetic storm, J. Geophys. Res, 112, (2007)

[8]

Sandanger M., Soraas F., Aarsnes K., Oksavik K., Evans D.S., Loss of relativistic electrons: Evidence for pitch angle scattering by electromagnetic ion cyclotron waves excited by unstable ring current protons, J. Geophys. Res, 112, (2007)

[9]

Summers D., Thorne R.M., Relativistic electron pitch-angle scattering by electromagnetic ion cyclotron waves during geomagnetic storms, J. Geophys. Res, 108, A4, (2003)

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