The dynamic cusp aurora on 30 November 1997: response to southward turning of the IMF
We document the detailed dynamics of the dayside aurora in the \sim1200-1600 MLT sector in response to a sharp southward turning of the interplanetary magnetic field (IMF) under negative IMF By conditions. Features not documented in previous work are elucidated by using two meridan scanning photomet...
Published in: | Annales Geophysicae |
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Format: | Article in Journal/Newspaper |
Language: | English |
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Springer Verlag
1999
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ftnonlinearchiv:oai:noa.gwlb.de:cop_mods_00036992 2023-05-15T17:48:28+02:00 The dynamic cusp aurora on 30 November 1997: response to southward turning of the IMF Sandholt, P. E. Farrugia, C. J. Lybekk, B. 1999-09 electronic https://doi.org/10.1007/s00585-999-1155-5 https://noa.gwlb.de/receive/cop_mods_00036992 https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00036946/angeo-17-1155-1999.pdf https://angeo.copernicus.org/articles/17/1155/1999/angeo-17-1155-1999.pdf eng eng Springer Verlag Annales Geophysicae -- http://www.bibliothek.uni-regensburg.de/ezeit/?1458425 -- https://www.ann-geophys.net/ -- https://www.ann-geophys.net/volumes.html -- http://link.springer.com/journal/585 -- 1432-0576 https://doi.org/10.1007/s00585-999-1155-5 https://noa.gwlb.de/receive/cop_mods_00036992 https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00036946/angeo-17-1155-1999.pdf https://angeo.copernicus.org/articles/17/1155/1999/angeo-17-1155-1999.pdf https://open-access.net/ uneingeschränkt info:eu-repo/semantics/openAccess article Verlagsveröffentlichung article Text doc-type:article 1999 ftnonlinearchiv https://doi.org/10.1007/s00585-999-1155-5 2022-02-08T22:43:45Z We document the detailed dynamics of the dayside aurora in the \sim1200-1600 MLT sector in response to a sharp southward turning of the interplanetary magnetic field (IMF) under negative IMF By conditions. Features not documented in previous work are elucidated by using two meridan scanning photometers (separated by 2 h) and an all-sky auroral imager in Ny Ålesund, Svalbard (75.5°MLAT) in combination with magnetograms from stations on Svalbard, covering the latitude range 71°75°MLAT. The initial auroral response may be divided into three phases consisting of: (1) intensification of both the red (630.0 nm) and green (557.7 nm) line emissions in the cusp aurora near 1200 MLT and ~100 km equatorward shift of its equatorward boundary, at ~75°MLAT, (2) eastward and poleward expansions of the cusp aurora, reaching the 1430 MLT meridian after 5-6 min, and (3) east-west expansion of the higher-latitude aurora (at ~77°78°MLAT) in the postnoon sector. The associated magnetic disturbance is characterized by an initial positive deflection of the X-component at stations located 100-400 km south of the aurora, corresponding to enhanced Sunward return flow associated with the merging convection cell in the post-noon sector. The sequence of partly overlapping poleward moving auroral forms (PMAFs) during the first 15 min, accompanied by corresponding pulsations in the convection current, was followed by a strong westward contraction of the cusp aurora when the ground magnetograms indicated a temporary return to the pre-onset level. These observations are discussed in relation to the Cowley-Lockwood model of ionospheric response to pulsed magnetopause reconnection. Key words. Mangetospheric physics (magnetopause · cusp and boundary layers; solar wind-magnetosphere interactions; auroral phenomena) Article in Journal/Newspaper Ny Ålesund Ny-Ålesund Svalbard Niedersächsisches Online-Archiv NOA Cowley ENVELOPE(-134.909,-134.909,60.518,60.518) Lockwood ENVELOPE(167.400,167.400,-84.150,-84.150) Ny-Ålesund Svalbard Annales Geophysicae 17 9 1155 1165 |
institution |
Open Polar |
collection |
Niedersächsisches Online-Archiv NOA |
op_collection_id |
ftnonlinearchiv |
language |
English |
topic |
article Verlagsveröffentlichung |
spellingShingle |
article Verlagsveröffentlichung Sandholt, P. E. Farrugia, C. J. Lybekk, B. The dynamic cusp aurora on 30 November 1997: response to southward turning of the IMF |
topic_facet |
article Verlagsveröffentlichung |
description |
We document the detailed dynamics of the dayside aurora in the \sim1200-1600 MLT sector in response to a sharp southward turning of the interplanetary magnetic field (IMF) under negative IMF By conditions. Features not documented in previous work are elucidated by using two meridan scanning photometers (separated by 2 h) and an all-sky auroral imager in Ny Ålesund, Svalbard (75.5°MLAT) in combination with magnetograms from stations on Svalbard, covering the latitude range 71°75°MLAT. The initial auroral response may be divided into three phases consisting of: (1) intensification of both the red (630.0 nm) and green (557.7 nm) line emissions in the cusp aurora near 1200 MLT and ~100 km equatorward shift of its equatorward boundary, at ~75°MLAT, (2) eastward and poleward expansions of the cusp aurora, reaching the 1430 MLT meridian after 5-6 min, and (3) east-west expansion of the higher-latitude aurora (at ~77°78°MLAT) in the postnoon sector. The associated magnetic disturbance is characterized by an initial positive deflection of the X-component at stations located 100-400 km south of the aurora, corresponding to enhanced Sunward return flow associated with the merging convection cell in the post-noon sector. The sequence of partly overlapping poleward moving auroral forms (PMAFs) during the first 15 min, accompanied by corresponding pulsations in the convection current, was followed by a strong westward contraction of the cusp aurora when the ground magnetograms indicated a temporary return to the pre-onset level. These observations are discussed in relation to the Cowley-Lockwood model of ionospheric response to pulsed magnetopause reconnection. Key words. Mangetospheric physics (magnetopause · cusp and boundary layers; solar wind-magnetosphere interactions; auroral phenomena) |
format |
Article in Journal/Newspaper |
author |
Sandholt, P. E. Farrugia, C. J. Lybekk, B. |
author_facet |
Sandholt, P. E. Farrugia, C. J. Lybekk, B. |
author_sort |
Sandholt, P. E. |
title |
The dynamic cusp aurora on 30 November 1997: response to southward turning of the IMF |
title_short |
The dynamic cusp aurora on 30 November 1997: response to southward turning of the IMF |
title_full |
The dynamic cusp aurora on 30 November 1997: response to southward turning of the IMF |
title_fullStr |
The dynamic cusp aurora on 30 November 1997: response to southward turning of the IMF |
title_full_unstemmed |
The dynamic cusp aurora on 30 November 1997: response to southward turning of the IMF |
title_sort |
dynamic cusp aurora on 30 november 1997: response to southward turning of the imf |
publisher |
Springer Verlag |
publishDate |
1999 |
url |
https://doi.org/10.1007/s00585-999-1155-5 https://noa.gwlb.de/receive/cop_mods_00036992 https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00036946/angeo-17-1155-1999.pdf https://angeo.copernicus.org/articles/17/1155/1999/angeo-17-1155-1999.pdf |
long_lat |
ENVELOPE(-134.909,-134.909,60.518,60.518) ENVELOPE(167.400,167.400,-84.150,-84.150) |
geographic |
Cowley Lockwood Ny-Ålesund Svalbard |
geographic_facet |
Cowley Lockwood Ny-Ålesund Svalbard |
genre |
Ny Ålesund Ny-Ålesund Svalbard |
genre_facet |
Ny Ålesund Ny-Ålesund Svalbard |
op_relation |
Annales Geophysicae -- http://www.bibliothek.uni-regensburg.de/ezeit/?1458425 -- https://www.ann-geophys.net/ -- https://www.ann-geophys.net/volumes.html -- http://link.springer.com/journal/585 -- 1432-0576 https://doi.org/10.1007/s00585-999-1155-5 https://noa.gwlb.de/receive/cop_mods_00036992 https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00036946/angeo-17-1155-1999.pdf https://angeo.copernicus.org/articles/17/1155/1999/angeo-17-1155-1999.pdf |
op_rights |
https://open-access.net/ uneingeschränkt info:eu-repo/semantics/openAccess |
op_doi |
https://doi.org/10.1007/s00585-999-1155-5 |
container_title |
Annales Geophysicae |
container_volume |
17 |
container_issue |
9 |
container_start_page |
1155 |
op_container_end_page |
1165 |
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1766154552297390080 |