Van Allen probes, NOAA, GOES, and ground observations of an intense EMIC wave event extending over 12 h in magnetic local time

Engebretson M. J.; Posch J. L.; Wygant J. R.Kletzing C. A.Lessard M. R.Huang C. -L.Spence H. E.Smith C. W.Singer H. J.Omura Y.Horne R. B.Reeves G. D.Baker D. N.Gkioulidou M.Oksavik K.Mann I. R.Raita T.Shiokawa K.

首页> 外文期刊>Journal of geophysical research >Van Allen probes, NOAA, GOES, and ground observations of an intense EMIC wave event extending over 12 h in magnetic local time

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Van Allen probes, NOAA, GOES, and ground observations of an intense EMIC wave event extending over 12 h in magnetic local time

机译：Van Allen probes, NOAA, GOES, and ground observations of an intense EMIC wave event extending over 12 h in magnetic local time

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abstract_textpAlthough most studies of the effects of electromagnetic ion cyclotron (EMIC) waves on Earth's outer radiation belt have focused on events in the afternoon sector in the outer plasmasphere or plume region, strong magnetospheric compressions provide an additional stimulus for EMIC wave generation across a large range of local times and L shells. We present here observations of the effects of a wave event on 23 February 2014 that extended over 8h in UT and over 12h in local time, stimulated by a gradual 4h rise and subsequent sharp increases in solar wind pressure. Large-amplitude linearly polarized hydrogen band EMIC waves (up to 25nT p-p) appeared for over 4h at both Van Allen Probes, from late morning through local noon, when these spacecraft were outside the plasmapause, with densities similar to 5-20cm(-3). Waves were also observed by ground-based induction magnetometers in Antarctica (near dawn), Finland (near local noon), Russia (in the afternoon), and in Canada (from dusk to midnight). Ten passes of NOAA-POES and METOP satellites near the northern foot point of the Van Allen Probes observed 30-80keV subauroral proton precipitation, often over extended L shell ranges; other passes identified a narrow L shell region of precipitation over Canada. Observations of relativistic electrons by the Van Allen Probes showed that the fluxes of more field-aligned and more energetic radiation belt electrons were reduced in response to both the emission over Canada and the more spatially extended emission associated with the compression, confirming the effectiveness of EMIC-induced loss processes for this event./p/abstract_text

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《Journal of geophysical research》 |2015年第7期|5465-5488|共24页
作者
Engebretson M. J.; Posch J. L.; Wygant J. R.Kletzing C. A.Lessard M. R.Huang C. -L.Spence H. E.Smith C. W.Singer H. J.Omura Y.Horne R. B.Reeves G. D.Baker D. N.Gkioulidou M.Oksavik K.Mann I. R.Raita T.Shiokawa K.;
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Augsburg Coll, Dept Phys, Minneapolis, MN 55454 USA;

Univ Minnesota, Sch Phys & Astron, Minneapolis, MN 55455 USA;

Univ Iowa, Dept Phys & Astron, Iowa City, IA 52242 USAUniv New Hampshire, Ctr Space Sci, Durham, NH 03824 USANOAA, Boulder, CO USAKyoto Univ, Res Inst Sustainable Humanosphere, Kyoto, JapanBritish Antarctic Survey, Cambridge CB3 0ET, EnglandLos Alamos Natl Lab, Space Sci & Applicat Grp, Los Alamos, NM USAUniv Colorado, Atmospher & Space Phys Lab, Boulder, CO 80309 USAJohns Hopkins Univ, Appl Phys Lab, Laurel, MD USAUniv Bergen, Birkeland Ctr Space Sci, Dept Phys & Technol, Bergen, NorwayUniv Ctr Svalbard, Longyearbyen, NorwayUniv Alberta, Dept Phys, Edmonton, AB, CanadaNASA, Goddard Space Flight Ctr, Greenbelt, MD 20771 USAUniv Oulu, Sodankyla Geophys Observ, Sodankyla, FinlandNagoya Univ, STELAB, Toyokawa, Japan;

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EMIC waves; radiation belts; magnetospheric compressions; ION-CYCLOTRON WAVES; RELATIVISTIC ELECTRON-PRECIPITATION; PITCH-ANGLE SCATTERING; EQUATORIAL MAGNETOSPHERE; PROTON PRECIPITATION; ENERGETIC PARTICLE; GEOMAGNETIC STORMS; PULSATIONS; GENERATION; FREQUENCY;

Van Allen probes, NOAA, GOES, and ground observations of an intense EMIC wave event extending over 12 h in magnetic local time

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