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Observations of an auroral streamer in a double oval configuration
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| Zeitschriftentitel: | Annales Geophysicae |
|---|---|
| Personen und Körperschaften: | , , , , , , , |
| In: | Annales Geophysicae, 29, 2011, 4, S. 701-716 |
| Format: | E-Article |
| Sprache: | Englisch |
| veröffentlicht: |
Copernicus GmbH
|
| Schlagwörter: |
| author_facet |
Amm, O. Nakamura, R. Takada, T. Kauristie, K. Frey, H. U. Owen, C. J. Aikio, A. Kuula, R. Amm, O. Nakamura, R. Takada, T. Kauristie, K. Frey, H. U. Owen, C. J. Aikio, A. Kuula, R. |
|---|---|
| author |
Amm, O. Nakamura, R. Takada, T. Kauristie, K. Frey, H. U. Owen, C. J. Aikio, A. Kuula, R. |
| spellingShingle |
Amm, O. Nakamura, R. Takada, T. Kauristie, K. Frey, H. U. Owen, C. J. Aikio, A. Kuula, R. Annales Geophysicae Observations of an auroral streamer in a double oval configuration Space and Planetary Science Earth and Planetary Sciences (miscellaneous) Atmospheric Science Geology Astronomy and Astrophysics |
| author_sort |
amm, o. |
| spelling |
Amm, O. Nakamura, R. Takada, T. Kauristie, K. Frey, H. U. Owen, C. J. Aikio, A. Kuula, R. 1432-0576 Copernicus GmbH Space and Planetary Science Earth and Planetary Sciences (miscellaneous) Atmospheric Science Geology Astronomy and Astrophysics http://dx.doi.org/10.5194/angeo-29-701-2011 <jats:p>Abstract. During the late evening and night of 14 September 2004, the nightside auroral oval shows a distinct double oval configuration for several hours after a substorm onset at ~18:45 UT. This structure is observed both by the IMAGE satellite optical instruments focusing on the Southern Hemisphere, and by the MIRACLE ground-based instrument network in Scandinavia. At ~21:17 UT during the recovery phase of the substorm, an auroral streamer is detected by these instruments and the EISCAT radar, while simultaneously the Cluster satellites observe a bursty bulk flow in the conjugate portion of the plasma sheet in the magnetotail. Our combined data analysis reveals significant differences between the ionospheric equivalent current signature of this streamer within a double oval configuration, as compared to previously studied streamer events without such a configuration. We attribute these differences to the presence of an additional poleward polarization electric field between the poleward and the equatorward portions of the double oval, and show with a simple model that such an assumption can conceptually explain the observations. Further, we estimate the total current transferred in meridional direction by this recovery phase streamer to ~80 kA, significantly less than for previously analysed expansion phase streamer events. Both results indicate that the development of auroral streamers is dependent on the ambient background conditions in the magnetosphere-ionosphere system. The auroral streamer event studied was simultaneously observed in the conjugate Northern and Southern Hemisphere ionosphere. </jats:p> Observations of an auroral streamer in a double oval configuration Annales Geophysicae |
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Observations of an auroral streamer in a double oval configuration |
| title_unstemmed |
Observations of an auroral streamer in a double oval configuration |
| title_full |
Observations of an auroral streamer in a double oval configuration |
| title_fullStr |
Observations of an auroral streamer in a double oval configuration |
| title_full_unstemmed |
Observations of an auroral streamer in a double oval configuration |
| title_short |
Observations of an auroral streamer in a double oval configuration |
| title_sort |
observations of an auroral streamer in a double oval configuration |
| topic |
Space and Planetary Science Earth and Planetary Sciences (miscellaneous) Atmospheric Science Geology Astronomy and Astrophysics |
| url |
http://dx.doi.org/10.5194/angeo-29-701-2011 |
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2011 |
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701-716 |
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<jats:p>Abstract. During the late evening and night of 14 September 2004, the nightside auroral oval shows a distinct double oval configuration for several hours after a substorm onset at ~18:45 UT. This structure is observed both by the IMAGE satellite optical instruments focusing on the Southern Hemisphere, and by the MIRACLE ground-based instrument network in Scandinavia. At ~21:17 UT during the recovery phase of the substorm, an auroral streamer is detected by these instruments and the EISCAT radar, while simultaneously the Cluster satellites observe a bursty bulk flow in the conjugate portion of the plasma sheet in the magnetotail. Our combined data analysis reveals significant differences between the ionospheric equivalent current signature of this streamer within a double oval configuration, as compared to previously studied streamer events without such a configuration. We attribute these differences to the presence of an additional poleward polarization electric field between the poleward and the equatorward portions of the double oval, and show with a simple model that such an assumption can conceptually explain the observations. Further, we estimate the total current transferred in meridional direction by this recovery phase streamer to ~80 kA, significantly less than for previously analysed expansion phase streamer events. Both results indicate that the development of auroral streamers is dependent on the ambient background conditions in the magnetosphere-ionosphere system. The auroral streamer event studied was simultaneously observed in the conjugate Northern and Southern Hemisphere ionosphere.
</jats:p> |
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| author | Amm, O., Nakamura, R., Takada, T., Kauristie, K., Frey, H. U., Owen, C. J., Aikio, A., Kuula, R. |
| author_facet | Amm, O., Nakamura, R., Takada, T., Kauristie, K., Frey, H. U., Owen, C. J., Aikio, A., Kuula, R., Amm, O., Nakamura, R., Takada, T., Kauristie, K., Frey, H. U., Owen, C. J., Aikio, A., Kuula, R. |
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| description | <jats:p>Abstract. During the late evening and night of 14 September 2004, the nightside auroral oval shows a distinct double oval configuration for several hours after a substorm onset at ~18:45 UT. This structure is observed both by the IMAGE satellite optical instruments focusing on the Southern Hemisphere, and by the MIRACLE ground-based instrument network in Scandinavia. At ~21:17 UT during the recovery phase of the substorm, an auroral streamer is detected by these instruments and the EISCAT radar, while simultaneously the Cluster satellites observe a bursty bulk flow in the conjugate portion of the plasma sheet in the magnetotail. Our combined data analysis reveals significant differences between the ionospheric equivalent current signature of this streamer within a double oval configuration, as compared to previously studied streamer events without such a configuration. We attribute these differences to the presence of an additional poleward polarization electric field between the poleward and the equatorward portions of the double oval, and show with a simple model that such an assumption can conceptually explain the observations. Further, we estimate the total current transferred in meridional direction by this recovery phase streamer to ~80 kA, significantly less than for previously analysed expansion phase streamer events. Both results indicate that the development of auroral streamers is dependent on the ambient background conditions in the magnetosphere-ionosphere system. The auroral streamer event studied was simultaneously observed in the conjugate Northern and Southern Hemisphere ionosphere. </jats:p> |
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| spelling | Amm, O. Nakamura, R. Takada, T. Kauristie, K. Frey, H. U. Owen, C. J. Aikio, A. Kuula, R. 1432-0576 Copernicus GmbH Space and Planetary Science Earth and Planetary Sciences (miscellaneous) Atmospheric Science Geology Astronomy and Astrophysics http://dx.doi.org/10.5194/angeo-29-701-2011 <jats:p>Abstract. During the late evening and night of 14 September 2004, the nightside auroral oval shows a distinct double oval configuration for several hours after a substorm onset at ~18:45 UT. This structure is observed both by the IMAGE satellite optical instruments focusing on the Southern Hemisphere, and by the MIRACLE ground-based instrument network in Scandinavia. At ~21:17 UT during the recovery phase of the substorm, an auroral streamer is detected by these instruments and the EISCAT radar, while simultaneously the Cluster satellites observe a bursty bulk flow in the conjugate portion of the plasma sheet in the magnetotail. Our combined data analysis reveals significant differences between the ionospheric equivalent current signature of this streamer within a double oval configuration, as compared to previously studied streamer events without such a configuration. We attribute these differences to the presence of an additional poleward polarization electric field between the poleward and the equatorward portions of the double oval, and show with a simple model that such an assumption can conceptually explain the observations. Further, we estimate the total current transferred in meridional direction by this recovery phase streamer to ~80 kA, significantly less than for previously analysed expansion phase streamer events. Both results indicate that the development of auroral streamers is dependent on the ambient background conditions in the magnetosphere-ionosphere system. The auroral streamer event studied was simultaneously observed in the conjugate Northern and Southern Hemisphere ionosphere. </jats:p> Observations of an auroral streamer in a double oval configuration Annales Geophysicae |
| spellingShingle | Amm, O., Nakamura, R., Takada, T., Kauristie, K., Frey, H. U., Owen, C. J., Aikio, A., Kuula, R., Annales Geophysicae, Observations of an auroral streamer in a double oval configuration, Space and Planetary Science, Earth and Planetary Sciences (miscellaneous), Atmospheric Science, Geology, Astronomy and Astrophysics |
| title | Observations of an auroral streamer in a double oval configuration |
| title_full | Observations of an auroral streamer in a double oval configuration |
| title_fullStr | Observations of an auroral streamer in a double oval configuration |
| title_full_unstemmed | Observations of an auroral streamer in a double oval configuration |
| title_short | Observations of an auroral streamer in a double oval configuration |
| title_sort | observations of an auroral streamer in a double oval configuration |
| title_unstemmed | Observations of an auroral streamer in a double oval configuration |
| topic | Space and Planetary Science, Earth and Planetary Sciences (miscellaneous), Atmospheric Science, Geology, Astronomy and Astrophysics |
| url | http://dx.doi.org/10.5194/angeo-29-701-2011 |