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Accelerated ions ahead of earthward propagating dipolarization fronts
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| Zeitschriftentitel: | Journal of Geophysical Research: Space Physics |
|---|---|
| Personen und Körperschaften: | , , , |
| In: | Journal of Geophysical Research: Space Physics, 115, 2010, A5 |
| Format: | E-Article |
| Sprache: | Englisch |
| veröffentlicht: |
American Geophysical Union (AGU)
|
| Schlagwörter: |
| author_facet |
Zhou, X.‐Z. Angelopoulos, V. Sergeev, V. A. Runov, A. Zhou, X.‐Z. Angelopoulos, V. Sergeev, V. A. Runov, A. |
|---|---|
| author |
Zhou, X.‐Z. Angelopoulos, V. Sergeev, V. A. Runov, A. |
| spellingShingle |
Zhou, X.‐Z. Angelopoulos, V. Sergeev, V. A. Runov, A. Journal of Geophysical Research: Space Physics Accelerated ions ahead of earthward propagating dipolarization fronts 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 |
zhou, x.‐z. |
| spelling |
Zhou, X.‐Z. Angelopoulos, V. Sergeev, V. A. Runov, A. 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/10.1029/2010ja015481 <jats:p>We report on the evolving ion distributions associated with the arrival of an earthward propagating dipolarization front in the near‐Earth magnetotail using Time History of Events and Macroscale Interactions during Substorms (THEMIS). Ion distributions exhibit steady duskward anisotropy well before the front arrival, suggesting thin current sheet formation at ∼11 <jats:italic>R</jats:italic><jats:sub><jats:italic>E</jats:italic></jats:sub>, during the growth phase of a moderate geomagnetic substorm. As the dipolarization front moves closer, an additional, earthward streaming ion population appears, resulting in an earthward velocity moment. This population eventually overwhelms the preexisting duskward anisotropy and merges with the earthward convecting bulk flow once the dipolarization front arrives. Test‐particle simulations show that the observed ion evolution is consistent with a picture of ions reflected and accelerated by the approaching front and moving ahead of it.</jats:p> Accelerated ions ahead of earthward propagating dipolarization fronts Journal of Geophysical Research: Space Physics |
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10.1029/2010ja015481 |
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Allgemeine Naturwissenschaft Physik Technik Geologie und Paläontologie Geographie Chemie und Pharmazie Land- und Forstwirtschaft, Gartenbau, Fischereiwirtschaft, Hauswirtschaft Biologie |
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| title |
Accelerated ions ahead of earthward propagating dipolarization fronts |
| title_unstemmed |
Accelerated ions ahead of earthward propagating dipolarization fronts |
| title_full |
Accelerated ions ahead of earthward propagating dipolarization fronts |
| title_fullStr |
Accelerated ions ahead of earthward propagating dipolarization fronts |
| title_full_unstemmed |
Accelerated ions ahead of earthward propagating dipolarization fronts |
| title_short |
Accelerated ions ahead of earthward propagating dipolarization fronts |
| title_sort |
accelerated ions ahead of earthward propagating dipolarization fronts |
| 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/10.1029/2010ja015481 |
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2010 |
| physical |
|
| description |
<jats:p>We report on the evolving ion distributions associated with the arrival of an earthward propagating dipolarization front in the near‐Earth magnetotail using Time History of Events and Macroscale Interactions during Substorms (THEMIS). Ion distributions exhibit steady duskward anisotropy well before the front arrival, suggesting thin current sheet formation at ∼11 <jats:italic>R</jats:italic><jats:sub><jats:italic>E</jats:italic></jats:sub>, during the growth phase of a moderate geomagnetic substorm. As the dipolarization front moves closer, an additional, earthward streaming ion population appears, resulting in an earthward velocity moment. This population eventually overwhelms the preexisting duskward anisotropy and merges with the earthward convecting bulk flow once the dipolarization front arrives. Test‐particle simulations show that the observed ion evolution is consistent with a picture of ions reflected and accelerated by the approaching front and moving ahead of it.</jats:p> |
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| author | Zhou, X.‐Z., Angelopoulos, V., Sergeev, V. A., Runov, A. |
| author_facet | Zhou, X.‐Z., Angelopoulos, V., Sergeev, V. A., Runov, A., Zhou, X.‐Z., Angelopoulos, V., Sergeev, V. A., Runov, A. |
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| description | <jats:p>We report on the evolving ion distributions associated with the arrival of an earthward propagating dipolarization front in the near‐Earth magnetotail using Time History of Events and Macroscale Interactions during Substorms (THEMIS). Ion distributions exhibit steady duskward anisotropy well before the front arrival, suggesting thin current sheet formation at ∼11 <jats:italic>R</jats:italic><jats:sub><jats:italic>E</jats:italic></jats:sub>, during the growth phase of a moderate geomagnetic substorm. As the dipolarization front moves closer, an additional, earthward streaming ion population appears, resulting in an earthward velocity moment. This population eventually overwhelms the preexisting duskward anisotropy and merges with the earthward convecting bulk flow once the dipolarization front arrives. Test‐particle simulations show that the observed ion evolution is consistent with a picture of ions reflected and accelerated by the approaching front and moving ahead of it.</jats:p> |
| doi_str_mv | 10.1029/2010ja015481 |
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| finc_class_facet | Allgemeine Naturwissenschaft, Physik, Technik, Geologie und Paläontologie, Geographie, Chemie und Pharmazie, Land- und Forstwirtschaft, Gartenbau, Fischereiwirtschaft, Hauswirtschaft, Biologie |
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| imprint_str_mv | American Geophysical Union (AGU), 2010 |
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| publishDate | 2010 |
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| spelling | Zhou, X.‐Z. Angelopoulos, V. Sergeev, V. A. Runov, A. 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/10.1029/2010ja015481 <jats:p>We report on the evolving ion distributions associated with the arrival of an earthward propagating dipolarization front in the near‐Earth magnetotail using Time History of Events and Macroscale Interactions during Substorms (THEMIS). Ion distributions exhibit steady duskward anisotropy well before the front arrival, suggesting thin current sheet formation at ∼11 <jats:italic>R</jats:italic><jats:sub><jats:italic>E</jats:italic></jats:sub>, during the growth phase of a moderate geomagnetic substorm. As the dipolarization front moves closer, an additional, earthward streaming ion population appears, resulting in an earthward velocity moment. This population eventually overwhelms the preexisting duskward anisotropy and merges with the earthward convecting bulk flow once the dipolarization front arrives. Test‐particle simulations show that the observed ion evolution is consistent with a picture of ions reflected and accelerated by the approaching front and moving ahead of it.</jats:p> Accelerated ions ahead of earthward propagating dipolarization fronts Journal of Geophysical Research: Space Physics |
| spellingShingle | Zhou, X.‐Z., Angelopoulos, V., Sergeev, V. A., Runov, A., Journal of Geophysical Research: Space Physics, Accelerated ions ahead of earthward propagating dipolarization fronts, 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 | Accelerated ions ahead of earthward propagating dipolarization fronts |
| title_full | Accelerated ions ahead of earthward propagating dipolarization fronts |
| title_fullStr | Accelerated ions ahead of earthward propagating dipolarization fronts |
| title_full_unstemmed | Accelerated ions ahead of earthward propagating dipolarization fronts |
| title_short | Accelerated ions ahead of earthward propagating dipolarization fronts |
| title_sort | accelerated ions ahead of earthward propagating dipolarization fronts |
| title_unstemmed | Accelerated ions ahead of earthward propagating dipolarization fronts |
| 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/10.1029/2010ja015481 |