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Reorganization of polar cap patches through shears in the background plasma convection
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| Zeitschriftentitel: | Journal of Geophysical Research: Space Physics |
|---|---|
| Personen und Körperschaften: | , , , , , |
| In: | Journal of Geophysical Research: Space Physics, 115, 2010, A1 |
| Format: | E-Article |
| Sprache: | Englisch |
| veröffentlicht: |
American Geophysical Union (AGU)
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| Schlagwörter: |
| author_facet |
Hosokawa, K. St‐Maurice, J.‐P. Sofko, G. J. Shiokawa, K. Otsuka, Y. Ogawa, T. Hosokawa, K. St‐Maurice, J.‐P. Sofko, G. J. Shiokawa, K. Otsuka, Y. Ogawa, T. |
|---|---|
| author |
Hosokawa, K. St‐Maurice, J.‐P. Sofko, G. J. Shiokawa, K. Otsuka, Y. Ogawa, T. |
| spellingShingle |
Hosokawa, K. St‐Maurice, J.‐P. Sofko, G. J. Shiokawa, K. Otsuka, Y. Ogawa, T. Journal of Geophysical Research: Space Physics Reorganization of polar cap patches through shears in the background plasma convection 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 |
hosokawa, k. |
| spelling |
Hosokawa, K. St‐Maurice, J.‐P. Sofko, G. J. Shiokawa, K. Otsuka, Y. Ogawa, T. 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/10.1029/2009ja014599 <jats:p>On the night of December 20, 2006, 630 nm airglow images obtained by an all‐sky camera at Resolute Bay, Canada (74.73°N, 265.07°E; altitude adjusted corrected geomagnetic (AACGM) latitude 82.9°) showed the passage of successive polar cap patches. Shortly after convection came to a temporary halt, one of the patches was reorganized into two substructures in approximately 8 min. The two‐dimensional background ionospheric convection pattern measured using the newly deployed PolarDARN radar at Rankin Inlet (62.82°N, 93.11°W; AACGM latitude 72.96°) showed that a velocity shear of approximately 120 m s<jats:sup>−1</jats:sup>/340 km suddenly appeared in the vicinity of the patch at the time of reorganization. A qualitative analysis of the relationship between the magnitude of the velocity shear and the distance between the divided patches indicates that the shear in the background plasma convection velocity significantly contributed to the reorganization of the patch. This shear structure appeared soon after a southward turning of the interplanetary magnetic field (IMF) and was probably associated with the reconfiguration of the convection pattern from a pre‐existing northward‐oriented IMF pattern to a southward‐oriented one. The present observations indicate that the reconfiguration/deformation of patches because of a shear in the background convection field, especially reorganization of patches into smaller substructures, may play an important role in the rapid structuring of patches.</jats:p> Reorganization of polar cap patches through shears in the background plasma convection Journal of Geophysical Research: Space Physics |
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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 |
Reorganization of polar cap patches through shears in the background plasma convection |
| title_unstemmed |
Reorganization of polar cap patches through shears in the background plasma convection |
| title_full |
Reorganization of polar cap patches through shears in the background plasma convection |
| title_fullStr |
Reorganization of polar cap patches through shears in the background plasma convection |
| title_full_unstemmed |
Reorganization of polar cap patches through shears in the background plasma convection |
| title_short |
Reorganization of polar cap patches through shears in the background plasma convection |
| title_sort |
reorganization of polar cap patches through shears in the background plasma convection |
| 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/10.1029/2009ja014599 |
| publishDate |
2010 |
| physical |
|
| description |
<jats:p>On the night of December 20, 2006, 630 nm airglow images obtained by an all‐sky camera at Resolute Bay, Canada (74.73°N, 265.07°E; altitude adjusted corrected geomagnetic (AACGM) latitude 82.9°) showed the passage of successive polar cap patches. Shortly after convection came to a temporary halt, one of the patches was reorganized into two substructures in approximately 8 min. The two‐dimensional background ionospheric convection pattern measured using the newly deployed PolarDARN radar at Rankin Inlet (62.82°N, 93.11°W; AACGM latitude 72.96°) showed that a velocity shear of approximately 120 m s<jats:sup>−1</jats:sup>/340 km suddenly appeared in the vicinity of the patch at the time of reorganization. A qualitative analysis of the relationship between the magnitude of the velocity shear and the distance between the divided patches indicates that the shear in the background plasma convection velocity significantly contributed to the reorganization of the patch. This shear structure appeared soon after a southward turning of the interplanetary magnetic field (IMF) and was probably associated with the reconfiguration of the convection pattern from a pre‐existing northward‐oriented IMF pattern to a southward‐oriented one. The present observations indicate that the reconfiguration/deformation of patches because of a shear in the background convection field, especially reorganization of patches into smaller substructures, may play an important role in the rapid structuring of patches.</jats:p> |
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| author | Hosokawa, K., St‐Maurice, J.‐P., Sofko, G. J., Shiokawa, K., Otsuka, Y., Ogawa, T. |
| author_facet | Hosokawa, K., St‐Maurice, J.‐P., Sofko, G. J., Shiokawa, K., Otsuka, Y., Ogawa, T., Hosokawa, K., St‐Maurice, J.‐P., Sofko, G. J., Shiokawa, K., Otsuka, Y., Ogawa, T. |
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| description | <jats:p>On the night of December 20, 2006, 630 nm airglow images obtained by an all‐sky camera at Resolute Bay, Canada (74.73°N, 265.07°E; altitude adjusted corrected geomagnetic (AACGM) latitude 82.9°) showed the passage of successive polar cap patches. Shortly after convection came to a temporary halt, one of the patches was reorganized into two substructures in approximately 8 min. The two‐dimensional background ionospheric convection pattern measured using the newly deployed PolarDARN radar at Rankin Inlet (62.82°N, 93.11°W; AACGM latitude 72.96°) showed that a velocity shear of approximately 120 m s<jats:sup>−1</jats:sup>/340 km suddenly appeared in the vicinity of the patch at the time of reorganization. A qualitative analysis of the relationship between the magnitude of the velocity shear and the distance between the divided patches indicates that the shear in the background plasma convection velocity significantly contributed to the reorganization of the patch. This shear structure appeared soon after a southward turning of the interplanetary magnetic field (IMF) and was probably associated with the reconfiguration of the convection pattern from a pre‐existing northward‐oriented IMF pattern to a southward‐oriented one. The present observations indicate that the reconfiguration/deformation of patches because of a shear in the background convection field, especially reorganization of patches into smaller substructures, may play an important role in the rapid structuring of patches.</jats:p> |
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| institution | DE-Ch1, DE-L229, DE-D275, DE-Bn3, DE-Brt1, DE-Zwi2, DE-D161, DE-Gla1, DE-Zi4, DE-15, DE-Pl11, DE-Rs1, DE-105, DE-14 |
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| spelling | Hosokawa, K. St‐Maurice, J.‐P. Sofko, G. J. Shiokawa, K. Otsuka, Y. Ogawa, T. 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/10.1029/2009ja014599 <jats:p>On the night of December 20, 2006, 630 nm airglow images obtained by an all‐sky camera at Resolute Bay, Canada (74.73°N, 265.07°E; altitude adjusted corrected geomagnetic (AACGM) latitude 82.9°) showed the passage of successive polar cap patches. Shortly after convection came to a temporary halt, one of the patches was reorganized into two substructures in approximately 8 min. The two‐dimensional background ionospheric convection pattern measured using the newly deployed PolarDARN radar at Rankin Inlet (62.82°N, 93.11°W; AACGM latitude 72.96°) showed that a velocity shear of approximately 120 m s<jats:sup>−1</jats:sup>/340 km suddenly appeared in the vicinity of the patch at the time of reorganization. A qualitative analysis of the relationship between the magnitude of the velocity shear and the distance between the divided patches indicates that the shear in the background plasma convection velocity significantly contributed to the reorganization of the patch. This shear structure appeared soon after a southward turning of the interplanetary magnetic field (IMF) and was probably associated with the reconfiguration of the convection pattern from a pre‐existing northward‐oriented IMF pattern to a southward‐oriented one. The present observations indicate that the reconfiguration/deformation of patches because of a shear in the background convection field, especially reorganization of patches into smaller substructures, may play an important role in the rapid structuring of patches.</jats:p> Reorganization of polar cap patches through shears in the background plasma convection Journal of Geophysical Research: Space Physics |
| spellingShingle | Hosokawa, K., St‐Maurice, J.‐P., Sofko, G. J., Shiokawa, K., Otsuka, Y., Ogawa, T., Journal of Geophysical Research: Space Physics, Reorganization of polar cap patches through shears in the background plasma convection, 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 | Reorganization of polar cap patches through shears in the background plasma convection |
| title_full | Reorganization of polar cap patches through shears in the background plasma convection |
| title_fullStr | Reorganization of polar cap patches through shears in the background plasma convection |
| title_full_unstemmed | Reorganization of polar cap patches through shears in the background plasma convection |
| title_short | Reorganization of polar cap patches through shears in the background plasma convection |
| title_sort | reorganization of polar cap patches through shears in the background plasma convection |
| title_unstemmed | Reorganization of polar cap patches through shears in the background plasma convection |
| 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/10.1029/2009ja014599 |