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Evolution of plasma sheet particle content under different interplanetary magnetic field conditions
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| Zeitschriftentitel: | Journal of Geophysical Research: Space Physics |
|---|---|
| Personen und Körperschaften: | , , , , |
| In: | Journal of Geophysical Research: Space Physics, 115, 2010, A6 |
| Format: | E-Article |
| Sprache: | Englisch |
| veröffentlicht: |
American Geophysical Union (AGU)
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| Schlagwörter: |
| author_facet |
Wang, Chih‐Ping Lyons, Larry R. Nagai, Tsugunobu Weygand, James M. Lui, A. T. Y. Wang, Chih‐Ping Lyons, Larry R. Nagai, Tsugunobu Weygand, James M. Lui, A. T. Y. |
|---|---|
| author |
Wang, Chih‐Ping Lyons, Larry R. Nagai, Tsugunobu Weygand, James M. Lui, A. T. Y. |
| spellingShingle |
Wang, Chih‐Ping Lyons, Larry R. Nagai, Tsugunobu Weygand, James M. Lui, A. T. Y. Journal of Geophysical Research: Space Physics Evolution of plasma sheet particle content under different interplanetary magnetic field conditions Paleontology Space and Planetary Science Earth and Planetary Sciences (miscellaneous) Atmospheric Science Earth-Surface Processes Geochemistry and Petrology Soil Science Water Science and Technology Ecology Aquatic Science Forestry Oceanography Geophysics |
| author_sort |
wang, chih‐ping |
| spelling |
Wang, Chih‐Ping Lyons, Larry R. Nagai, Tsugunobu Weygand, James M. Lui, A. T. Y. 0148-0227 American Geophysical Union (AGU) Paleontology Space and Planetary Science Earth and Planetary Sciences (miscellaneous) Atmospheric Science Earth-Surface Processes Geochemistry and Petrology Soil Science Water Science and Technology Ecology Aquatic Science Forestry Oceanography Geophysics http://dx.doi.org/10.1029/2009ja015028 <jats:p>We have statistically analyzed Geotail data to investigate the processes that result in a plasma sheet that is denser under a prolonged northward than southward interplanetary magnetic field (IMF) period. The observations show that the change of number density with the IMF conditions is mainly due to the changes of particle number per unit magnetic flux (particle content <jats:italic>N</jats:italic>), with <jats:italic>N</jats:italic> increasing (decreasing) as the period of northward (southward) IMF extends. The changes are quicker in the first ∼2 to 4 h then substantially slow down. The <jats:italic>Y</jats:italic> profiles show that <jats:italic>N</jats:italic> is always lowest around midnight and becomes higher toward the flanks. The observed plasma velocities suggest that plasma sheet particles undergo earthward and flankward drift transport, as well as diffusive transport resulting from drift fluctuations. The diffusion coefficients associated with fluctuating drift are estimated to be ∼10<jats:sup>5</jats:sup> to 10<jats:sup>6</jats:sup> km<jats:sup>2</jats:sup>/s. We have simulated evolution of <jats:italic>N</jats:italic> resulting from drift and diffusive transport with particle sources along the flanks. The simulation results show that the observed temporal and <jats:italic>Y</jats:italic> variations of <jats:italic>N</jats:italic> under different IMF conditions can be accounted for by the competition between the particle increase owing to particles diffusing toward midnight from the flank sources and the particle decrease owing to particles drifting away from midnight. As the IMF turns northward (southward), it is mainly the strengthening (weakening) of diffusive transport owing to the increase (decrease) of the flank source that results in the increase (decrease) of <jats:italic>N</jats:italic>.</jats:p> Evolution of plasma sheet particle content under different interplanetary magnetic field conditions Journal of Geophysical Research: Space Physics |
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10.1029/2009ja015028 |
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Physik Technik Geologie und Paläontologie Geographie Chemie und Pharmazie Land- und Forstwirtschaft, Gartenbau, Fischereiwirtschaft, Hauswirtschaft Biologie Allgemeine Naturwissenschaft |
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| title |
Evolution of plasma sheet particle content under different interplanetary magnetic field conditions |
| title_unstemmed |
Evolution of plasma sheet particle content under different interplanetary magnetic field conditions |
| title_full |
Evolution of plasma sheet particle content under different interplanetary magnetic field conditions |
| title_fullStr |
Evolution of plasma sheet particle content under different interplanetary magnetic field conditions |
| title_full_unstemmed |
Evolution of plasma sheet particle content under different interplanetary magnetic field conditions |
| title_short |
Evolution of plasma sheet particle content under different interplanetary magnetic field conditions |
| title_sort |
evolution of plasma sheet particle content under different interplanetary magnetic field conditions |
| topic |
Paleontology Space and Planetary Science Earth and Planetary Sciences (miscellaneous) Atmospheric Science Earth-Surface Processes Geochemistry and Petrology Soil Science Water Science and Technology Ecology Aquatic Science Forestry Oceanography Geophysics |
| url |
http://dx.doi.org/10.1029/2009ja015028 |
| publishDate |
2010 |
| physical |
|
| description |
<jats:p>We have statistically analyzed Geotail data to investigate the processes that result in a plasma sheet that is denser under a prolonged northward than southward interplanetary magnetic field (IMF) period. The observations show that the change of number density with the IMF conditions is mainly due to the changes of particle number per unit magnetic flux (particle content <jats:italic>N</jats:italic>), with <jats:italic>N</jats:italic> increasing (decreasing) as the period of northward (southward) IMF extends. The changes are quicker in the first ∼2 to 4 h then substantially slow down. The <jats:italic>Y</jats:italic> profiles show that <jats:italic>N</jats:italic> is always lowest around midnight and becomes higher toward the flanks. The observed plasma velocities suggest that plasma sheet particles undergo earthward and flankward drift transport, as well as diffusive transport resulting from drift fluctuations. The diffusion coefficients associated with fluctuating drift are estimated to be ∼10<jats:sup>5</jats:sup> to 10<jats:sup>6</jats:sup> km<jats:sup>2</jats:sup>/s. We have simulated evolution of <jats:italic>N</jats:italic> resulting from drift and diffusive transport with particle sources along the flanks. The simulation results show that the observed temporal and <jats:italic>Y</jats:italic> variations of <jats:italic>N</jats:italic> under different IMF conditions can be accounted for by the competition between the particle increase owing to particles diffusing toward midnight from the flank sources and the particle decrease owing to particles drifting away from midnight. As the IMF turns northward (southward), it is mainly the strengthening (weakening) of diffusive transport owing to the increase (decrease) of the flank source that results in the increase (decrease) of <jats:italic>N</jats:italic>.</jats:p> |
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| author | Wang, Chih‐Ping, Lyons, Larry R., Nagai, Tsugunobu, Weygand, James M., Lui, A. T. Y. |
| author_facet | Wang, Chih‐Ping, Lyons, Larry R., Nagai, Tsugunobu, Weygand, James M., Lui, A. T. Y., Wang, Chih‐Ping, Lyons, Larry R., Nagai, Tsugunobu, Weygand, James M., Lui, A. T. Y. |
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| description | <jats:p>We have statistically analyzed Geotail data to investigate the processes that result in a plasma sheet that is denser under a prolonged northward than southward interplanetary magnetic field (IMF) period. The observations show that the change of number density with the IMF conditions is mainly due to the changes of particle number per unit magnetic flux (particle content <jats:italic>N</jats:italic>), with <jats:italic>N</jats:italic> increasing (decreasing) as the period of northward (southward) IMF extends. The changes are quicker in the first ∼2 to 4 h then substantially slow down. The <jats:italic>Y</jats:italic> profiles show that <jats:italic>N</jats:italic> is always lowest around midnight and becomes higher toward the flanks. The observed plasma velocities suggest that plasma sheet particles undergo earthward and flankward drift transport, as well as diffusive transport resulting from drift fluctuations. The diffusion coefficients associated with fluctuating drift are estimated to be ∼10<jats:sup>5</jats:sup> to 10<jats:sup>6</jats:sup> km<jats:sup>2</jats:sup>/s. We have simulated evolution of <jats:italic>N</jats:italic> resulting from drift and diffusive transport with particle sources along the flanks. The simulation results show that the observed temporal and <jats:italic>Y</jats:italic> variations of <jats:italic>N</jats:italic> under different IMF conditions can be accounted for by the competition between the particle increase owing to particles diffusing toward midnight from the flank sources and the particle decrease owing to particles drifting away from midnight. As the IMF turns northward (southward), it is mainly the strengthening (weakening) of diffusive transport owing to the increase (decrease) of the flank source that results in the increase (decrease) of <jats:italic>N</jats:italic>.</jats:p> |
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| imprint | American Geophysical Union (AGU), 2010 |
| imprint_str_mv | American Geophysical Union (AGU), 2010 |
| institution | DE-D275, DE-Bn3, DE-Brt1, DE-Zwi2, DE-D161, DE-Gla1, DE-Zi4, DE-15, DE-Rs1, DE-Pl11, DE-105, DE-14, DE-Ch1, DE-L229 |
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| physical | |
| publishDate | 2010 |
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| publisher | American Geophysical Union (AGU) |
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| series | Journal of Geophysical Research: Space Physics |
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| spelling | Wang, Chih‐Ping Lyons, Larry R. Nagai, Tsugunobu Weygand, James M. Lui, A. T. Y. 0148-0227 American Geophysical Union (AGU) Paleontology Space and Planetary Science Earth and Planetary Sciences (miscellaneous) Atmospheric Science Earth-Surface Processes Geochemistry and Petrology Soil Science Water Science and Technology Ecology Aquatic Science Forestry Oceanography Geophysics http://dx.doi.org/10.1029/2009ja015028 <jats:p>We have statistically analyzed Geotail data to investigate the processes that result in a plasma sheet that is denser under a prolonged northward than southward interplanetary magnetic field (IMF) period. The observations show that the change of number density with the IMF conditions is mainly due to the changes of particle number per unit magnetic flux (particle content <jats:italic>N</jats:italic>), with <jats:italic>N</jats:italic> increasing (decreasing) as the period of northward (southward) IMF extends. The changes are quicker in the first ∼2 to 4 h then substantially slow down. The <jats:italic>Y</jats:italic> profiles show that <jats:italic>N</jats:italic> is always lowest around midnight and becomes higher toward the flanks. The observed plasma velocities suggest that plasma sheet particles undergo earthward and flankward drift transport, as well as diffusive transport resulting from drift fluctuations. The diffusion coefficients associated with fluctuating drift are estimated to be ∼10<jats:sup>5</jats:sup> to 10<jats:sup>6</jats:sup> km<jats:sup>2</jats:sup>/s. We have simulated evolution of <jats:italic>N</jats:italic> resulting from drift and diffusive transport with particle sources along the flanks. The simulation results show that the observed temporal and <jats:italic>Y</jats:italic> variations of <jats:italic>N</jats:italic> under different IMF conditions can be accounted for by the competition between the particle increase owing to particles diffusing toward midnight from the flank sources and the particle decrease owing to particles drifting away from midnight. As the IMF turns northward (southward), it is mainly the strengthening (weakening) of diffusive transport owing to the increase (decrease) of the flank source that results in the increase (decrease) of <jats:italic>N</jats:italic>.</jats:p> Evolution of plasma sheet particle content under different interplanetary magnetic field conditions Journal of Geophysical Research: Space Physics |
| spellingShingle | Wang, Chih‐Ping, Lyons, Larry R., Nagai, Tsugunobu, Weygand, James M., Lui, A. T. Y., Journal of Geophysical Research: Space Physics, Evolution of plasma sheet particle content under different interplanetary magnetic field conditions, Paleontology, Space and Planetary Science, Earth and Planetary Sciences (miscellaneous), Atmospheric Science, Earth-Surface Processes, Geochemistry and Petrology, Soil Science, Water Science and Technology, Ecology, Aquatic Science, Forestry, Oceanography, Geophysics |
| title | Evolution of plasma sheet particle content under different interplanetary magnetic field conditions |
| title_full | Evolution of plasma sheet particle content under different interplanetary magnetic field conditions |
| title_fullStr | Evolution of plasma sheet particle content under different interplanetary magnetic field conditions |
| title_full_unstemmed | Evolution of plasma sheet particle content under different interplanetary magnetic field conditions |
| title_short | Evolution of plasma sheet particle content under different interplanetary magnetic field conditions |
| title_sort | evolution of plasma sheet particle content under different interplanetary magnetic field conditions |
| title_unstemmed | Evolution of plasma sheet particle content under different interplanetary magnetic field conditions |
| topic | Paleontology, Space and Planetary Science, Earth and Planetary Sciences (miscellaneous), Atmospheric Science, Earth-Surface Processes, Geochemistry and Petrology, Soil Science, Water Science and Technology, Ecology, Aquatic Science, Forestry, Oceanography, Geophysics |
| url | http://dx.doi.org/10.1029/2009ja015028 |