Segmentation of SED by Boundary Flows Associated With Westward Drifting Partial Ring current
Abstract The segmentation mechanism of polar cap patches is agreed to be related to temporal changes of interplanetary magnetic field or transient reconnection. In this letter, using Global Ionosphere Thermosphere Model driven by two‐way coupled Block‐Adaptive‐Tree‐Solarwind‐Roe‐Upwind‐Scheme and Ri...
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| Main Authors: | , , , , , |
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| Format: | Article |
| Language: | English |
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Wiley
2019-07-01
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| Series: | Geophysical Research Letters |
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| Online Access: | https://doi.org/10.1029/2019GL084041 |
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| _version_ | 1849336528074964992 |
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| author | Zihan Wang Shasha Zou Thomas Coppeans Jiaen Ren Aaron Ridley Tamas Gombosi |
| author_facet | Zihan Wang Shasha Zou Thomas Coppeans Jiaen Ren Aaron Ridley Tamas Gombosi |
| author_sort | Zihan Wang |
| collection | DOAJ |
| description | Abstract The segmentation mechanism of polar cap patches is agreed to be related to temporal changes of interplanetary magnetic field or transient reconnection. In this letter, using Global Ionosphere Thermosphere Model driven by two‐way coupled Block‐Adaptive‐Tree‐Solarwind‐Roe‐Upwind‐Scheme and Rice Convection Model, a new segmentation mechanism is proposed. This mechanism works as follows: A strong boundary flow between the Region 1 and Region 2 field‐aligned currents develops, while a shielding process develops in the inner magnetosphere. As the partial ring current drifts westward, the peak of the boundary flow also moves westward. This strong boundary flow raises the ion temperature through enhanced frictional heating, enhances the chemical recombination reaction rate, and reduces the electron density. When this boundary flow crosses the storm‐enhanced density (SED) plume, the plume will be segmented into patches. No external interplanetary magnetic field variations or transient reconnections are required in this mechanism. |
| format | Article |
| id | doaj-art-dd9205b2f57e4f5ca1cf168d8efc2887 |
| institution | Kabale University |
| issn | 0094-8276 1944-8007 |
| language | English |
| publishDate | 2019-07-01 |
| publisher | Wiley |
| record_format | Article |
| series | Geophysical Research Letters |
| spelling | doaj-art-dd9205b2f57e4f5ca1cf168d8efc28872025-08-20T03:44:57ZengWileyGeophysical Research Letters0094-82761944-80072019-07-0146147920792810.1029/2019GL084041Segmentation of SED by Boundary Flows Associated With Westward Drifting Partial Ring currentZihan Wang0Shasha Zou1Thomas Coppeans2Jiaen Ren3Aaron Ridley4Tamas Gombosi5Department of Climate and Space Sciences and Engineering University of Michigan Ann Arbor MI USADepartment of Climate and Space Sciences and Engineering University of Michigan Ann Arbor MI USADepartment of Climate and Space Sciences and Engineering University of Michigan Ann Arbor MI USADepartment of Climate and Space Sciences and Engineering University of Michigan Ann Arbor MI USADepartment of Climate and Space Sciences and Engineering University of Michigan Ann Arbor MI USADepartment of Climate and Space Sciences and Engineering University of Michigan Ann Arbor MI USAAbstract The segmentation mechanism of polar cap patches is agreed to be related to temporal changes of interplanetary magnetic field or transient reconnection. In this letter, using Global Ionosphere Thermosphere Model driven by two‐way coupled Block‐Adaptive‐Tree‐Solarwind‐Roe‐Upwind‐Scheme and Rice Convection Model, a new segmentation mechanism is proposed. This mechanism works as follows: A strong boundary flow between the Region 1 and Region 2 field‐aligned currents develops, while a shielding process develops in the inner magnetosphere. As the partial ring current drifts westward, the peak of the boundary flow also moves westward. This strong boundary flow raises the ion temperature through enhanced frictional heating, enhances the chemical recombination reaction rate, and reduces the electron density. When this boundary flow crosses the storm‐enhanced density (SED) plume, the plume will be segmented into patches. No external interplanetary magnetic field variations or transient reconnections are required in this mechanism.https://doi.org/10.1029/2019GL084041polar cap patchpartial ring currentBirkeland current boundary flow |
| spellingShingle | Zihan Wang Shasha Zou Thomas Coppeans Jiaen Ren Aaron Ridley Tamas Gombosi Segmentation of SED by Boundary Flows Associated With Westward Drifting Partial Ring current Geophysical Research Letters polar cap patch partial ring current Birkeland current boundary flow |
| title | Segmentation of SED by Boundary Flows Associated With Westward Drifting Partial Ring current |
| title_full | Segmentation of SED by Boundary Flows Associated With Westward Drifting Partial Ring current |
| title_fullStr | Segmentation of SED by Boundary Flows Associated With Westward Drifting Partial Ring current |
| title_full_unstemmed | Segmentation of SED by Boundary Flows Associated With Westward Drifting Partial Ring current |
| title_short | Segmentation of SED by Boundary Flows Associated With Westward Drifting Partial Ring current |
| title_sort | segmentation of sed by boundary flows associated with westward drifting partial ring current |
| topic | polar cap patch partial ring current Birkeland current boundary flow |
| url | https://doi.org/10.1029/2019GL084041 |
| work_keys_str_mv | AT zihanwang segmentationofsedbyboundaryflowsassociatedwithwestwarddriftingpartialringcurrent AT shashazou segmentationofsedbyboundaryflowsassociatedwithwestwarddriftingpartialringcurrent AT thomascoppeans segmentationofsedbyboundaryflowsassociatedwithwestwarddriftingpartialringcurrent AT jiaenren segmentationofsedbyboundaryflowsassociatedwithwestwarddriftingpartialringcurrent AT aaronridley segmentationofsedbyboundaryflowsassociatedwithwestwarddriftingpartialringcurrent AT tamasgombosi segmentationofsedbyboundaryflowsassociatedwithwestwarddriftingpartialringcurrent |