Geomagnetic Responses Associated With Throat Aurora
Abstract Throat aurora is a special discrete auroral form often observed at the ionospheric convection throat region near magnetic local noon. Some observational properties of throat aurora have been established, but the geomagnetic response is not yet explored. Using geomagnetic observations from a...
| Main Authors: | , , , , |
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| Format: | Article |
| Language: | English |
| Published: |
American Geophysical Union (AGU)
2020-08-01
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| Series: | Earth and Space Science |
| Subjects: | |
| Online Access: | https://doi.org/10.1029/2020EA001214 |
| _version_ | 1818432596441300992 |
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| author | R. Selvakumaran D.‐S. Han S. Zhou S. A. Gokani Y. L. Zhang |
| author_facet | R. Selvakumaran D.‐S. Han S. Zhou S. A. Gokani Y. L. Zhang |
| author_sort | R. Selvakumaran |
| collection | DOAJ |
| description | Abstract Throat aurora is a special discrete auroral form often observed at the ionospheric convection throat region near magnetic local noon. Some observational properties of throat aurora have been established, but the geomagnetic response is not yet explored. Using geomagnetic observations from a chain of stations in the Norwegian sector and auroral observations from an all‐sky imager and the DMSP satellites, for the first time, we identify geomagnetic responses associated with the occurrence of throat aurora. These variations are well explained by combining the models of flux transfer events and throat aurora. The estimated increase in ionospheric equivalent current confirms the association of throat aurora with ground observations. The results provide further evidence for throat aurora being associated with magnetopause reconnection. Based on the observational features, a new association of geomagnetic variations with throat aurora may be defined to reflect their occurrence at high latitudes near local noon. |
| first_indexed | 2024-12-14T16:07:43Z |
| format | Article |
| id | doaj.art-1b88844d4c1a4b6cb6067c5da30ede7b |
| institution | Directory Open Access Journal |
| issn | 2333-5084 |
| language | English |
| last_indexed | 2024-12-14T16:07:43Z |
| publishDate | 2020-08-01 |
| publisher | American Geophysical Union (AGU) |
| record_format | Article |
| series | Earth and Space Science |
| spelling | doaj.art-1b88844d4c1a4b6cb6067c5da30ede7b2022-12-21T22:55:02ZengAmerican Geophysical Union (AGU)Earth and Space Science2333-50842020-08-0178n/an/a10.1029/2020EA001214Geomagnetic Responses Associated With Throat AuroraR. Selvakumaran0D.‐S. Han1S. Zhou2S. A. Gokani3Y. L. Zhang4State Key Laboratory of Marine Geology, School of Ocean and Earth Science Tongji University Shanghai ChinaState Key Laboratory of Marine Geology, School of Ocean and Earth Science Tongji University Shanghai ChinaState Key Laboratory of Marine Geology, School of Ocean and Earth Science Tongji University Shanghai ChinaState Key Laboratory of Marine Geology, School of Ocean and Earth Science Tongji University Shanghai ChinaThe Johns Hopkins University Applied Physics Laboratory Laurel MD USAAbstract Throat aurora is a special discrete auroral form often observed at the ionospheric convection throat region near magnetic local noon. Some observational properties of throat aurora have been established, but the geomagnetic response is not yet explored. Using geomagnetic observations from a chain of stations in the Norwegian sector and auroral observations from an all‐sky imager and the DMSP satellites, for the first time, we identify geomagnetic responses associated with the occurrence of throat aurora. These variations are well explained by combining the models of flux transfer events and throat aurora. The estimated increase in ionospheric equivalent current confirms the association of throat aurora with ground observations. The results provide further evidence for throat aurora being associated with magnetopause reconnection. Based on the observational features, a new association of geomagnetic variations with throat aurora may be defined to reflect their occurrence at high latitudes near local noon.https://doi.org/10.1029/2020EA001214throat aurorageomagnetic responseflux transfer events |
| spellingShingle | R. Selvakumaran D.‐S. Han S. Zhou S. A. Gokani Y. L. Zhang Geomagnetic Responses Associated With Throat Aurora Earth and Space Science throat aurora geomagnetic response flux transfer events |
| title | Geomagnetic Responses Associated With Throat Aurora |
| title_full | Geomagnetic Responses Associated With Throat Aurora |
| title_fullStr | Geomagnetic Responses Associated With Throat Aurora |
| title_full_unstemmed | Geomagnetic Responses Associated With Throat Aurora |
| title_short | Geomagnetic Responses Associated With Throat Aurora |
| title_sort | geomagnetic responses associated with throat aurora |
| topic | throat aurora geomagnetic response flux transfer events |
| url | https://doi.org/10.1029/2020EA001214 |
| work_keys_str_mv | AT rselvakumaran geomagneticresponsesassociatedwiththroataurora AT dshan geomagneticresponsesassociatedwiththroataurora AT szhou geomagneticresponsesassociatedwiththroataurora AT sagokani geomagneticresponsesassociatedwiththroataurora AT ylzhang geomagneticresponsesassociatedwiththroataurora |