Coordinated optical and EISCAT observations of black aurora
An image intensified video camera was used in conjunction with the EISCAT radar in Tromsø, Norway, for detailed studies of non-sheared black aurora on March 5, 2002. While it is known that a downward field-aligned current will decrease the ionospheric plasma density, any measurable effect will depen...
Published in: | Geophysical Research Letters |
---|---|
Main Authors: | , |
Format: | Article in Journal/Newspaper |
Language: | English |
Published: |
2004
|
Subjects: | |
Online Access: | https://eprints.lancs.ac.uk/id/eprint/6637/ https://eprints.lancs.ac.uk/id/eprint/6637/1/art_588.pdf https://doi.org/10.1029/2003GL019244 |
id |
ftulancaster:oai:eprints.lancs.ac.uk:6637 |
---|---|
record_format |
openpolar |
spelling |
ftulancaster:oai:eprints.lancs.ac.uk:6637 2023-08-27T04:09:13+02:00 Coordinated optical and EISCAT observations of black aurora Blixt, E. M. Kosch, M. J. 2004-03 application/pdf https://eprints.lancs.ac.uk/id/eprint/6637/ https://eprints.lancs.ac.uk/id/eprint/6637/1/art_588.pdf https://doi.org/10.1029/2003GL019244 en eng https://eprints.lancs.ac.uk/id/eprint/6637/1/art_588.pdf Blixt, E. M. and Kosch, M. J. (2004) Coordinated optical and EISCAT observations of black aurora. Geophysical Research Letters, 31 (6). ISSN 0094-8276 Journal Article PeerReviewed 2004 ftulancaster https://doi.org/10.1029/2003GL019244 2023-08-03T22:16:13Z An image intensified video camera was used in conjunction with the EISCAT radar in Tromsø, Norway, for detailed studies of non-sheared black aurora on March 5, 2002. While it is known that a downward field-aligned current will decrease the ionospheric plasma density, any measurable effect will depend on the noise-level in the density measurements and the background density. The results show that the plasma density is not reduced in the regions of black aurora, which shows that if a downward current existed within the black aurora, it must be less than ∼0.6 μA/m2. Combining this result with recent findings that small scale currents are generally strong, that the downward currents are associated with intense diverging electric fields, and that the observed black arcs show no signs of shear motion, it is concluded that the non-sheared black aurora is not associated with any significant downward field-aligned current. Article in Journal/Newspaper EISCAT Tromsø Lancaster University: Lancaster Eprints Norway Tromsø Geophysical Research Letters 31 6 n/a n/a |
institution |
Open Polar |
collection |
Lancaster University: Lancaster Eprints |
op_collection_id |
ftulancaster |
language |
English |
description |
An image intensified video camera was used in conjunction with the EISCAT radar in Tromsø, Norway, for detailed studies of non-sheared black aurora on March 5, 2002. While it is known that a downward field-aligned current will decrease the ionospheric plasma density, any measurable effect will depend on the noise-level in the density measurements and the background density. The results show that the plasma density is not reduced in the regions of black aurora, which shows that if a downward current existed within the black aurora, it must be less than ∼0.6 μA/m2. Combining this result with recent findings that small scale currents are generally strong, that the downward currents are associated with intense diverging electric fields, and that the observed black arcs show no signs of shear motion, it is concluded that the non-sheared black aurora is not associated with any significant downward field-aligned current. |
format |
Article in Journal/Newspaper |
author |
Blixt, E. M. Kosch, M. J. |
spellingShingle |
Blixt, E. M. Kosch, M. J. Coordinated optical and EISCAT observations of black aurora |
author_facet |
Blixt, E. M. Kosch, M. J. |
author_sort |
Blixt, E. M. |
title |
Coordinated optical and EISCAT observations of black aurora |
title_short |
Coordinated optical and EISCAT observations of black aurora |
title_full |
Coordinated optical and EISCAT observations of black aurora |
title_fullStr |
Coordinated optical and EISCAT observations of black aurora |
title_full_unstemmed |
Coordinated optical and EISCAT observations of black aurora |
title_sort |
coordinated optical and eiscat observations of black aurora |
publishDate |
2004 |
url |
https://eprints.lancs.ac.uk/id/eprint/6637/ https://eprints.lancs.ac.uk/id/eprint/6637/1/art_588.pdf https://doi.org/10.1029/2003GL019244 |
geographic |
Norway Tromsø |
geographic_facet |
Norway Tromsø |
genre |
EISCAT Tromsø |
genre_facet |
EISCAT Tromsø |
op_relation |
https://eprints.lancs.ac.uk/id/eprint/6637/1/art_588.pdf Blixt, E. M. and Kosch, M. J. (2004) Coordinated optical and EISCAT observations of black aurora. Geophysical Research Letters, 31 (6). ISSN 0094-8276 |
op_doi |
https://doi.org/10.1029/2003GL019244 |
container_title |
Geophysical Research Letters |
container_volume |
31 |
container_issue |
6 |
container_start_page |
n/a |
op_container_end_page |
n/a |
_version_ |
1775350377502212096 |