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Equatorially confined warm trapped ions at around 100 eV near the plasmapause
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| Zeitschriftentitel: | Geophysical Research Letters |
|---|---|
| Personen und Körperschaften: | , , , |
| In: | Geophysical Research Letters, 39, 2012, 15 |
| Format: | E-Article |
| Sprache: | Englisch |
| veröffentlicht: |
American Geophysical Union (AGU)
|
| Schlagwörter: |
| author_facet |
Yamauchi, M. Dandouras, I. Rème, H. El‐Lemdani Mazouz, F. Yamauchi, M. Dandouras, I. Rème, H. El‐Lemdani Mazouz, F. |
|---|---|
| author |
Yamauchi, M. Dandouras, I. Rème, H. El‐Lemdani Mazouz, F. |
| spellingShingle |
Yamauchi, M. Dandouras, I. Rème, H. El‐Lemdani Mazouz, F. Geophysical Research Letters Equatorially confined warm trapped ions at around 100 eV near the plasmapause General Earth and Planetary Sciences Geophysics |
| author_sort |
yamauchi, m. |
| spelling |
Yamauchi, M. Dandouras, I. Rème, H. El‐Lemdani Mazouz, F. 0094-8276 1944-8007 American Geophysical Union (AGU) General Earth and Planetary Sciences Geophysics http://dx.doi.org/10.1029/2012gl052366 <jats:p>Near the equatorial plasmapause at around 4–5 Earth radius (R<jats:sub>E</jats:sub>) geocentric distance, pancake distributed tens of eV ions are sometimes found, as previously reported by Olsen et al. (1987). Cluster CIS data during perigee traversals in 2001–2002 (nearly 200 traversals) revealed new features of these equatorially‐trapped warm ions. (1) The characteristic energy of He<jats:sup>+</jats:sup> is often higher than that of H<jats:sup>+</jats:sup>. (2) Some events show non‐thermal ring distribution for He<jats:sup>+</jats:sup> rather than superthermal pancake distribution. H<jats:sup>+</jats:sup>can also have the ring distribution in such events. (3) While majority of the events are dispersion‐free, some events show energy‐time dispersion, indicating drifts from different local times. (4) The time scale of the development is about an hour, which is much shorter than the drifting time of these ions around the Earth. Cluster statistics also confirmed some results from the previous studies: (5) These ions are confined within a few degrees of latitudinal range near the equator, and have nearly 90° pitch angles. (6) At a geocentric distance of about 4–4.5 R<jats:sub>E</jats:sub>where Cluster traversed the equator during its perigee, the probability of observing clear events is about 40–45% in the noon and dusk sectors and about 20–25% in the night‐to‐dawn sector. (7) They are dominated by H<jats:sup>+</jats:sup> with variable content of He<jats:sup>+</jats:sup>. The He<jats:sup>+</jats:sup>/H<jats:sup>+</jats:sup> ratio is much less than 5% for the majority of the cases.</jats:p> Equatorially confined warm trapped ions at around 100 eV near the plasmapause Geophysical Research Letters |
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10.1029/2012gl052366 |
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| title |
Equatorially confined warm trapped ions at around 100 eV near the plasmapause |
| title_unstemmed |
Equatorially confined warm trapped ions at around 100 eV near the plasmapause |
| title_full |
Equatorially confined warm trapped ions at around 100 eV near the plasmapause |
| title_fullStr |
Equatorially confined warm trapped ions at around 100 eV near the plasmapause |
| title_full_unstemmed |
Equatorially confined warm trapped ions at around 100 eV near the plasmapause |
| title_short |
Equatorially confined warm trapped ions at around 100 eV near the plasmapause |
| title_sort |
equatorially confined warm trapped ions at around 100 ev near the plasmapause |
| topic |
General Earth and Planetary Sciences Geophysics |
| url |
http://dx.doi.org/10.1029/2012gl052366 |
| publishDate |
2012 |
| physical |
|
| description |
<jats:p>Near the equatorial plasmapause at around 4–5 Earth radius (R<jats:sub>E</jats:sub>) geocentric distance, pancake distributed tens of eV ions are sometimes found, as previously reported by Olsen et al. (1987). Cluster CIS data during perigee traversals in 2001–2002 (nearly 200 traversals) revealed new features of these equatorially‐trapped warm ions. (1) The characteristic energy of He<jats:sup>+</jats:sup> is often higher than that of H<jats:sup>+</jats:sup>. (2) Some events show non‐thermal ring distribution for He<jats:sup>+</jats:sup> rather than superthermal pancake distribution. H<jats:sup>+</jats:sup>can also have the ring distribution in such events. (3) While majority of the events are dispersion‐free, some events show energy‐time dispersion, indicating drifts from different local times. (4) The time scale of the development is about an hour, which is much shorter than the drifting time of these ions around the Earth. Cluster statistics also confirmed some results from the previous studies: (5) These ions are confined within a few degrees of latitudinal range near the equator, and have nearly 90° pitch angles. (6) At a geocentric distance of about 4–4.5 R<jats:sub>E</jats:sub>where Cluster traversed the equator during its perigee, the probability of observing clear events is about 40–45% in the noon and dusk sectors and about 20–25% in the night‐to‐dawn sector. (7) They are dominated by H<jats:sup>+</jats:sup> with variable content of He<jats:sup>+</jats:sup>. The He<jats:sup>+</jats:sup>/H<jats:sup>+</jats:sup> ratio is much less than 5% for the majority of the cases.</jats:p> |
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| author | Yamauchi, M., Dandouras, I., Rème, H., El‐Lemdani Mazouz, F. |
| author_facet | Yamauchi, M., Dandouras, I., Rème, H., El‐Lemdani Mazouz, F., Yamauchi, M., Dandouras, I., Rème, H., El‐Lemdani Mazouz, F. |
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| description | <jats:p>Near the equatorial plasmapause at around 4–5 Earth radius (R<jats:sub>E</jats:sub>) geocentric distance, pancake distributed tens of eV ions are sometimes found, as previously reported by Olsen et al. (1987). Cluster CIS data during perigee traversals in 2001–2002 (nearly 200 traversals) revealed new features of these equatorially‐trapped warm ions. (1) The characteristic energy of He<jats:sup>+</jats:sup> is often higher than that of H<jats:sup>+</jats:sup>. (2) Some events show non‐thermal ring distribution for He<jats:sup>+</jats:sup> rather than superthermal pancake distribution. H<jats:sup>+</jats:sup>can also have the ring distribution in such events. (3) While majority of the events are dispersion‐free, some events show energy‐time dispersion, indicating drifts from different local times. (4) The time scale of the development is about an hour, which is much shorter than the drifting time of these ions around the Earth. Cluster statistics also confirmed some results from the previous studies: (5) These ions are confined within a few degrees of latitudinal range near the equator, and have nearly 90° pitch angles. (6) At a geocentric distance of about 4–4.5 R<jats:sub>E</jats:sub>where Cluster traversed the equator during its perigee, the probability of observing clear events is about 40–45% in the noon and dusk sectors and about 20–25% in the night‐to‐dawn sector. (7) They are dominated by H<jats:sup>+</jats:sup> with variable content of He<jats:sup>+</jats:sup>. The He<jats:sup>+</jats:sup>/H<jats:sup>+</jats:sup> ratio is much less than 5% for the majority of the cases.</jats:p> |
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| imprint | American Geophysical Union (AGU), 2012 |
| imprint_str_mv | American Geophysical Union (AGU), 2012 |
| institution | DE-Gla1, DE-Zi4, DE-15, DE-Pl11, DE-Rs1, DE-105, DE-14, DE-Ch1, DE-L229, DE-D275, DE-Bn3, DE-Brt1, DE-Zwi2, DE-D161 |
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| publisher | American Geophysical Union (AGU) |
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| recordtype | ai |
| series | Geophysical Research Letters |
| source_id | 49 |
| spelling | Yamauchi, M. Dandouras, I. Rème, H. El‐Lemdani Mazouz, F. 0094-8276 1944-8007 American Geophysical Union (AGU) General Earth and Planetary Sciences Geophysics http://dx.doi.org/10.1029/2012gl052366 <jats:p>Near the equatorial plasmapause at around 4–5 Earth radius (R<jats:sub>E</jats:sub>) geocentric distance, pancake distributed tens of eV ions are sometimes found, as previously reported by Olsen et al. (1987). Cluster CIS data during perigee traversals in 2001–2002 (nearly 200 traversals) revealed new features of these equatorially‐trapped warm ions. (1) The characteristic energy of He<jats:sup>+</jats:sup> is often higher than that of H<jats:sup>+</jats:sup>. (2) Some events show non‐thermal ring distribution for He<jats:sup>+</jats:sup> rather than superthermal pancake distribution. H<jats:sup>+</jats:sup>can also have the ring distribution in such events. (3) While majority of the events are dispersion‐free, some events show energy‐time dispersion, indicating drifts from different local times. (4) The time scale of the development is about an hour, which is much shorter than the drifting time of these ions around the Earth. Cluster statistics also confirmed some results from the previous studies: (5) These ions are confined within a few degrees of latitudinal range near the equator, and have nearly 90° pitch angles. (6) At a geocentric distance of about 4–4.5 R<jats:sub>E</jats:sub>where Cluster traversed the equator during its perigee, the probability of observing clear events is about 40–45% in the noon and dusk sectors and about 20–25% in the night‐to‐dawn sector. (7) They are dominated by H<jats:sup>+</jats:sup> with variable content of He<jats:sup>+</jats:sup>. The He<jats:sup>+</jats:sup>/H<jats:sup>+</jats:sup> ratio is much less than 5% for the majority of the cases.</jats:p> Equatorially confined warm trapped ions at around 100 eV near the plasmapause Geophysical Research Letters |
| spellingShingle | Yamauchi, M., Dandouras, I., Rème, H., El‐Lemdani Mazouz, F., Geophysical Research Letters, Equatorially confined warm trapped ions at around 100 eV near the plasmapause, General Earth and Planetary Sciences, Geophysics |
| title | Equatorially confined warm trapped ions at around 100 eV near the plasmapause |
| title_full | Equatorially confined warm trapped ions at around 100 eV near the plasmapause |
| title_fullStr | Equatorially confined warm trapped ions at around 100 eV near the plasmapause |
| title_full_unstemmed | Equatorially confined warm trapped ions at around 100 eV near the plasmapause |
| title_short | Equatorially confined warm trapped ions at around 100 eV near the plasmapause |
| title_sort | equatorially confined warm trapped ions at around 100 ev near the plasmapause |
| title_unstemmed | Equatorially confined warm trapped ions at around 100 eV near the plasmapause |
| topic | General Earth and Planetary Sciences, Geophysics |
| url | http://dx.doi.org/10.1029/2012gl052366 |