Electron dropout echoes induced by interplanetary shock: Van Allen Probes observations
Abstract On 23 November 2012, a sudden dropout of the relativistic electron flux was observed after an interplanetary shock arrival. The dropout peaks at ∼1 MeV and more than 80% of the electrons disappeared from the drift shell. Van Allen twin Probes observed a sharp electron flux dropout with clea...
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| Main Authors: | , , , , , , , , , , |
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| Format: | Article |
| Language: | English |
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Wiley
2016-06-01
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| Series: | Geophysical Research Letters |
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| Online Access: | https://doi.org/10.1002/2016GL069140 |
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| author | Y. X. Hao Q.‐G. Zong X.‐Z. Zhou S. Y. Fu R. Rankin C.‐J. Yuan A. T. Y. Lui H. E. Spence J. B. Blake D. N. Baker G. D. Reeves |
| author_facet | Y. X. Hao Q.‐G. Zong X.‐Z. Zhou S. Y. Fu R. Rankin C.‐J. Yuan A. T. Y. Lui H. E. Spence J. B. Blake D. N. Baker G. D. Reeves |
| author_sort | Y. X. Hao |
| collection | DOAJ |
| description | Abstract On 23 November 2012, a sudden dropout of the relativistic electron flux was observed after an interplanetary shock arrival. The dropout peaks at ∼1 MeV and more than 80% of the electrons disappeared from the drift shell. Van Allen twin Probes observed a sharp electron flux dropout with clear energy dispersion signals. The repeating flux dropout and recovery signatures, or “dropout echoes”, constitute a new phenomenon referred to as a “drifting electron dropout” with a limited initial spatial range. The azimuthal range of the dropout is estimated to be on the duskside, from ∼1300 to 0100 LT. We conclude that the shock‐induced electron dropout is not caused by the magnetopause shadowing. The dropout and consequent echoes suggest that the radial migration of relativistic electrons is induced by the strong dusk‐dawn asymmetric interplanetary shock compression on the magnetosphere. |
| format | Article |
| id | doaj-art-08e7c924c75d4d3ab4196277933d5bf7 |
| institution | OA Journals |
| issn | 0094-8276 1944-8007 |
| language | English |
| publishDate | 2016-06-01 |
| publisher | Wiley |
| record_format | Article |
| series | Geophysical Research Letters |
| spelling | doaj-art-08e7c924c75d4d3ab4196277933d5bf72025-08-20T02:31:41ZengWileyGeophysical Research Letters0094-82761944-80072016-06-0143115597560510.1002/2016GL069140Electron dropout echoes induced by interplanetary shock: Van Allen Probes observationsY. X. Hao0Q.‐G. Zong1X.‐Z. Zhou2S. Y. Fu3R. Rankin4C.‐J. Yuan5A. T. Y. Lui6H. E. Spence7J. B. Blake8D. N. Baker9G. D. Reeves10Institute of Space Physics and Applied Technology Peking University Beijing ChinaInstitute of Space Physics and Applied Technology Peking University Beijing ChinaInstitute of Space Physics and Applied Technology Peking University Beijing ChinaInstitute of Space Physics and Applied Technology Peking University Beijing ChinaDepartment of Physics University of Alberta Edmonton Alberta CanadaInstitute of Geology and Geophysics Chinese Academy of Sciences Beijing ChinaApplied Physics Laboratory Johns Hopkins University Laurel MarylandDepartment of Physics Institute for Earth, Oceans and Space University of New Hampshire Durham New Hampshire USAThe Aerospace Corporation Los Angeles California USASpace and Atmospheric Sciences Group Los Alamos National Laboratory Los Alamos New Mexico USALaboratory for Atmospheric and Space Physics University of Colorado Boulder Colorado USAAbstract On 23 November 2012, a sudden dropout of the relativistic electron flux was observed after an interplanetary shock arrival. The dropout peaks at ∼1 MeV and more than 80% of the electrons disappeared from the drift shell. Van Allen twin Probes observed a sharp electron flux dropout with clear energy dispersion signals. The repeating flux dropout and recovery signatures, or “dropout echoes”, constitute a new phenomenon referred to as a “drifting electron dropout” with a limited initial spatial range. The azimuthal range of the dropout is estimated to be on the duskside, from ∼1300 to 0100 LT. We conclude that the shock‐induced electron dropout is not caused by the magnetopause shadowing. The dropout and consequent echoes suggest that the radial migration of relativistic electrons is induced by the strong dusk‐dawn asymmetric interplanetary shock compression on the magnetosphere.https://doi.org/10.1002/2016GL069140electron dropout echoenergetic particlesolar wind‐magnetospheric couplinginterplanetary shockmagnetopause shadowingdrift shell splitting |
| spellingShingle | Y. X. Hao Q.‐G. Zong X.‐Z. Zhou S. Y. Fu R. Rankin C.‐J. Yuan A. T. Y. Lui H. E. Spence J. B. Blake D. N. Baker G. D. Reeves Electron dropout echoes induced by interplanetary shock: Van Allen Probes observations Geophysical Research Letters electron dropout echo energetic particle solar wind‐magnetospheric coupling interplanetary shock magnetopause shadowing drift shell splitting |
| title | Electron dropout echoes induced by interplanetary shock: Van Allen Probes observations |
| title_full | Electron dropout echoes induced by interplanetary shock: Van Allen Probes observations |
| title_fullStr | Electron dropout echoes induced by interplanetary shock: Van Allen Probes observations |
| title_full_unstemmed | Electron dropout echoes induced by interplanetary shock: Van Allen Probes observations |
| title_short | Electron dropout echoes induced by interplanetary shock: Van Allen Probes observations |
| title_sort | electron dropout echoes induced by interplanetary shock van allen probes observations |
| topic | electron dropout echo energetic particle solar wind‐magnetospheric coupling interplanetary shock magnetopause shadowing drift shell splitting |
| url | https://doi.org/10.1002/2016GL069140 |
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