Investigation of the relationship between optical auroral forms and HF radar E region backscatter
International audience The SuperDARN HF radars have been employed in the past to investigate the spectral characteristics of coherent backscatter from L -shell aligned features in the auroral E region. The present study employs all-sky camera observations of the aurora from Husafell, Iceland, and th...
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ftinsu:oai:HAL:hal-00329138v1 2023-11-12T04:19:10+01:00 Investigation of the relationship between optical auroral forms and HF radar E region backscatter Milan, S. E. Lester, M. Sato, N. Takizawa, H. Villain, J.-P. Department of Physics and Astronomy Leicester University of Leicester National Institute of Polar Research Tokyo (NiPR) Tohoku University Sendai Centre National de la Recherche Scientifique (CNRS) 2000 https://hal.science/hal-00329138 https://hal.science/hal-00329138/document https://hal.science/hal-00329138/file/angeo-18-608-2000.pdf en eng HAL CCSD European Geosciences Union hal-00329138 https://hal.science/hal-00329138 https://hal.science/hal-00329138/document https://hal.science/hal-00329138/file/angeo-18-608-2000.pdf info:eu-repo/semantics/OpenAccess ISSN: 0992-7689 EISSN: 1432-0576 Annales Geophysicae https://hal.science/hal-00329138 Annales Geophysicae, 2000, 18 (6), pp.608-617 [SDU.OCEAN]Sciences of the Universe [physics]/Ocean Atmosphere [SDU.STU]Sciences of the Universe [physics]/Earth Sciences info:eu-repo/semantics/article Journal articles 2000 ftinsu 2023-10-25T16:24:33Z International audience The SuperDARN HF radars have been employed in the past to investigate the spectral characteristics of coherent backscatter from L -shell aligned features in the auroral E region. The present study employs all-sky camera observations of the aurora from Husafell, Iceland, and the two SuperDARN radars located on Iceland, Þykkvibær and Stokkseyri, to determine the optical signature of such backscatter features. It is shown that, especially during quiet geomagnetic conditions, the backscatter region is closely associated with east-west aligned diffuse auroral features, and that the two move in tandem with each other. This association between optical and radar aurora has repercussions for the instability mechanisms responsible for generating the E region irregularities from which radars scatter. This is discussed and compared with previous studies investigating the relationship between optical and VHF radar aurora. In addition, although it is known that E region backscatter is commonly observed by SuperDARN radars, the present study demonstrates for the first time that multiple radars can observe the same feature to extend over at least 3 h of magnetic local time, allowing precipitation features to be mapped over large portions of the auroral zone. Article in Journal/Newspaper Iceland Institut national des sciences de l'Univers: HAL-INSU Husafell ENVELOPE(-20.893,-20.893,64.700,64.700) Stokkseyri ENVELOPE(-21.059,-21.059,63.838,63.838) |
institution |
Open Polar |
collection |
Institut national des sciences de l'Univers: HAL-INSU |
op_collection_id |
ftinsu |
language |
English |
topic |
[SDU.OCEAN]Sciences of the Universe [physics]/Ocean Atmosphere [SDU.STU]Sciences of the Universe [physics]/Earth Sciences |
spellingShingle |
[SDU.OCEAN]Sciences of the Universe [physics]/Ocean Atmosphere [SDU.STU]Sciences of the Universe [physics]/Earth Sciences Milan, S. E. Lester, M. Sato, N. Takizawa, H. Villain, J.-P. Investigation of the relationship between optical auroral forms and HF radar E region backscatter |
topic_facet |
[SDU.OCEAN]Sciences of the Universe [physics]/Ocean Atmosphere [SDU.STU]Sciences of the Universe [physics]/Earth Sciences |
description |
International audience The SuperDARN HF radars have been employed in the past to investigate the spectral characteristics of coherent backscatter from L -shell aligned features in the auroral E region. The present study employs all-sky camera observations of the aurora from Husafell, Iceland, and the two SuperDARN radars located on Iceland, Þykkvibær and Stokkseyri, to determine the optical signature of such backscatter features. It is shown that, especially during quiet geomagnetic conditions, the backscatter region is closely associated with east-west aligned diffuse auroral features, and that the two move in tandem with each other. This association between optical and radar aurora has repercussions for the instability mechanisms responsible for generating the E region irregularities from which radars scatter. This is discussed and compared with previous studies investigating the relationship between optical and VHF radar aurora. In addition, although it is known that E region backscatter is commonly observed by SuperDARN radars, the present study demonstrates for the first time that multiple radars can observe the same feature to extend over at least 3 h of magnetic local time, allowing precipitation features to be mapped over large portions of the auroral zone. |
author2 |
Department of Physics and Astronomy Leicester University of Leicester National Institute of Polar Research Tokyo (NiPR) Tohoku University Sendai Centre National de la Recherche Scientifique (CNRS) |
format |
Article in Journal/Newspaper |
author |
Milan, S. E. Lester, M. Sato, N. Takizawa, H. Villain, J.-P. |
author_facet |
Milan, S. E. Lester, M. Sato, N. Takizawa, H. Villain, J.-P. |
author_sort |
Milan, S. E. |
title |
Investigation of the relationship between optical auroral forms and HF radar E region backscatter |
title_short |
Investigation of the relationship between optical auroral forms and HF radar E region backscatter |
title_full |
Investigation of the relationship between optical auroral forms and HF radar E region backscatter |
title_fullStr |
Investigation of the relationship between optical auroral forms and HF radar E region backscatter |
title_full_unstemmed |
Investigation of the relationship between optical auroral forms and HF radar E region backscatter |
title_sort |
investigation of the relationship between optical auroral forms and hf radar e region backscatter |
publisher |
HAL CCSD |
publishDate |
2000 |
url |
https://hal.science/hal-00329138 https://hal.science/hal-00329138/document https://hal.science/hal-00329138/file/angeo-18-608-2000.pdf |
long_lat |
ENVELOPE(-20.893,-20.893,64.700,64.700) ENVELOPE(-21.059,-21.059,63.838,63.838) |
geographic |
Husafell Stokkseyri |
geographic_facet |
Husafell Stokkseyri |
genre |
Iceland |
genre_facet |
Iceland |
op_source |
ISSN: 0992-7689 EISSN: 1432-0576 Annales Geophysicae https://hal.science/hal-00329138 Annales Geophysicae, 2000, 18 (6), pp.608-617 |
op_relation |
hal-00329138 https://hal.science/hal-00329138 https://hal.science/hal-00329138/document https://hal.science/hal-00329138/file/angeo-18-608-2000.pdf |
op_rights |
info:eu-repo/semantics/OpenAccess |
_version_ |
1782335670517235712 |