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Global-scale coherence modulation of radiation-belt electron loss from plasmaspheric hiss.
Breneman, A W; Halford, A; Millan, R; McCarthy, M; Fennell, J; Sample, J; Woodger, L; Hospodarsky, G; Wygant, J R; Cattell, C A; Goldstein, J; Malaspina, D; Kletzing, C A.
Afiliación
  • Breneman AW; School of Physics and Astronomy, University of Minnesota, Minneapolis, Minnesota 55455, USA.
  • Halford A; Department of Physics and Astronomy, Dartmouth College, Hanover, New Hampshire 03755, USA.
  • Millan R; Department of Physics and Astronomy, Dartmouth College, Hanover, New Hampshire 03755, USA.
  • McCarthy M; Earth and Space Sciences, University of Washington, Seattle, Washington 98195, USA.
  • Fennell J; Aerospace Corporation, Los Angeles, California 90009, USA.
  • Sample J; Space Sciences Laboratory, University of California, Berkeley, California 94720, USA.
  • Woodger L; Department of Physics and Astronomy, Dartmouth College, Hanover, New Hampshire 03755, USA.
  • Hospodarsky G; Department of Physics and Astronomy, University of Iowa, Iowa City, Iowa 52242, USA.
  • Wygant JR; School of Physics and Astronomy, University of Minnesota, Minneapolis, Minnesota 55455, USA.
  • Cattell CA; School of Physics and Astronomy, University of Minnesota, Minneapolis, Minnesota 55455, USA.
  • Goldstein J; Southwest Research Institute, San Antonio, Texas 78238, USA.
  • Malaspina D; University of Colorado, The Laboratory for Atmospheric and Space Physics (LASP), Boulder, Colorado 80303, USA.
  • Kletzing CA; Department of Physics and Astronomy, University of Iowa, Iowa City, Iowa 52242, USA.
Nature ; 523(7559): 193-5, 2015 Jul 09.
Article en En | MEDLINE | ID: mdl-26123022
Over 40 years ago it was suggested that electron loss in the region of the radiation belts that overlaps with the region of high plasma density called the plasmasphere, within four to five Earth radii, arises largely from interaction with an electromagnetic plasma wave called plasmaspheric hiss. This interaction strongly influences the evolution of the radiation belts during a geomagnetic storm, and over the course of many hours to days helps to return the radiation-belt structure to its 'quiet' pre-storm configuration. Observations have shown that the long-term electron-loss rate is consistent with this theory but the temporal and spatial dynamics of the loss process remain to be directly verified. Here we report simultaneous measurements of structured radiation-belt electron losses and the hiss phenomenon that causes the losses. Losses were observed in the form of bremsstrahlung X-rays generated by hiss-scattered electrons colliding with the Earth's atmosphere after removal from the radiation belts. Our results show that changes of up to an order of magnitude in the dynamics of electron loss arising from hiss occur on timescales as short as one to twenty minutes, in association with modulations in plasma density and magnetic field. Furthermore, these loss dynamics are coherent with hiss dynamics on spatial scales comparable to the size of the plasmasphere. This nearly global-scale coherence was not predicted and may affect the short-term evolution of the radiation belts during active times.
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Texto completo: 1 Colección: 01-internacional Base de datos: MEDLINE Idioma: En Revista: Nature Año: 2015 Tipo del documento: Article País de afiliación: Estados Unidos Pais de publicación: Reino Unido
Texto completo
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Texto completo: 1 Colección: 01-internacional Base de datos: MEDLINE Idioma: En Revista: Nature Año: 2015 Tipo del documento: Article País de afiliación: Estados Unidos Pais de publicación: Reino Unido