South Pole Station ground‐based and Cluster satellite measurements of leaked and escaping Auroral Kilometric Radiation
Previous work suggests that Auroral Kilometric Radiation (AKR) leaks to low altitudes. To investigate this phenomenon, wideband wave measurements have been conducted simultaneously at South Pole, Antarctica, and at the Cluster satellites, during 35 intervals in 2018–2020. Leaked AKR is observed ∼5%...
Main Authors: | , , |
---|---|
Format: | Article in Journal/Newspaper |
Language: | English |
Published: |
American Geophysical Union (AGU)
2022
|
Subjects: | |
Online Access: | https://eprints.whiterose.ac.uk/183355/ https://eprints.whiterose.ac.uk/183355/1/JGR%20Space%20Physics%20-%202022%20-%20LaBelle%20-%20South%20Pole%20Station%20Ground%E2%80%90Based%20and%20Cluster%20Satellite%20Measurements%20of%20Leaked%20and.pdf |
id |
ftleedsuniv:oai:eprints.whiterose.ac.uk:183355 |
---|---|
record_format |
openpolar |
spelling |
ftleedsuniv:oai:eprints.whiterose.ac.uk:183355 2023-05-15T13:55:51+02:00 South Pole Station ground‐based and Cluster satellite measurements of leaked and escaping Auroral Kilometric Radiation LaBelle, J. Yearby, K. Pickett, J.S. 2022-02 text https://eprints.whiterose.ac.uk/183355/ https://eprints.whiterose.ac.uk/183355/1/JGR%20Space%20Physics%20-%202022%20-%20LaBelle%20-%20South%20Pole%20Station%20Ground%E2%80%90Based%20and%20Cluster%20Satellite%20Measurements%20of%20Leaked%20and.pdf en eng American Geophysical Union (AGU) https://eprints.whiterose.ac.uk/183355/1/JGR%20Space%20Physics%20-%202022%20-%20LaBelle%20-%20South%20Pole%20Station%20Ground%E2%80%90Based%20and%20Cluster%20Satellite%20Measurements%20of%20Leaked%20and.pdf LaBelle, J., Yearby, K. orcid.org/0000-0002-7605-4393 and Pickett, J.S. (2022) South Pole Station ground‐based and Cluster satellite measurements of leaked and escaping Auroral Kilometric Radiation. Journal of Geophysical Research: Space Physics, 127 (2). e2021JA029399. ISSN 2169-9380 Article PeerReviewed 2022 ftleedsuniv 2023-01-30T22:44:30Z Previous work suggests that Auroral Kilometric Radiation (AKR) leaks to low altitudes. To investigate this phenomenon, wideband wave measurements have been conducted simultaneously at South Pole, Antarctica, and at the Cluster satellites, during 35 intervals in 2018–2020. Leaked AKR is observed ∼5% of the time at South Pole and escaping AKR ∼31% of the time at Cluster satellites. Both types of AKR are composed of fine structure, and similar fine structure is often observed simultaneously in the AKR at the different locations. Around 0317 UT on 29 June 2020, identical features were observed simultaneously. Cluster interferometry shows that the footprint of the source field line during this event lies within a few hundred kilometers of South Pole. The estimated emitted power of the escaping AKR observed at Cluster in this event exceeds that of the leaked AKR observed at South Pole by many orders of magnitude, suggesting that mode conversion involved in generating leaked AKR is relatively inefficient. AKR fine structure which is identical at the two locations comprises ∼0.1%–0.3% of AKR observed at Cluster when the South Pole receiver operates, and ∼2% of AKR observed at South Pole when at least one Cluster satellite is tuned to the appropriate frequency range. The relatively low occurrence rates of coincident fine structure may be attributed partly to geometric and beaming considerations but also suggest that processes involved in generating leaked AKR at levels detectable at ground level have lower probability than those generating escaping AKR at levels detectable by distant spacecraft. Article in Journal/Newspaper Antarc* Antarctica South pole South pole White Rose Research Online (Universities of Leeds, Sheffield & York) South Pole |
institution |
Open Polar |
collection |
White Rose Research Online (Universities of Leeds, Sheffield & York) |
op_collection_id |
ftleedsuniv |
language |
English |
description |
Previous work suggests that Auroral Kilometric Radiation (AKR) leaks to low altitudes. To investigate this phenomenon, wideband wave measurements have been conducted simultaneously at South Pole, Antarctica, and at the Cluster satellites, during 35 intervals in 2018–2020. Leaked AKR is observed ∼5% of the time at South Pole and escaping AKR ∼31% of the time at Cluster satellites. Both types of AKR are composed of fine structure, and similar fine structure is often observed simultaneously in the AKR at the different locations. Around 0317 UT on 29 June 2020, identical features were observed simultaneously. Cluster interferometry shows that the footprint of the source field line during this event lies within a few hundred kilometers of South Pole. The estimated emitted power of the escaping AKR observed at Cluster in this event exceeds that of the leaked AKR observed at South Pole by many orders of magnitude, suggesting that mode conversion involved in generating leaked AKR is relatively inefficient. AKR fine structure which is identical at the two locations comprises ∼0.1%–0.3% of AKR observed at Cluster when the South Pole receiver operates, and ∼2% of AKR observed at South Pole when at least one Cluster satellite is tuned to the appropriate frequency range. The relatively low occurrence rates of coincident fine structure may be attributed partly to geometric and beaming considerations but also suggest that processes involved in generating leaked AKR at levels detectable at ground level have lower probability than those generating escaping AKR at levels detectable by distant spacecraft. |
format |
Article in Journal/Newspaper |
author |
LaBelle, J. Yearby, K. Pickett, J.S. |
spellingShingle |
LaBelle, J. Yearby, K. Pickett, J.S. South Pole Station ground‐based and Cluster satellite measurements of leaked and escaping Auroral Kilometric Radiation |
author_facet |
LaBelle, J. Yearby, K. Pickett, J.S. |
author_sort |
LaBelle, J. |
title |
South Pole Station ground‐based and Cluster satellite measurements of leaked and escaping Auroral Kilometric Radiation |
title_short |
South Pole Station ground‐based and Cluster satellite measurements of leaked and escaping Auroral Kilometric Radiation |
title_full |
South Pole Station ground‐based and Cluster satellite measurements of leaked and escaping Auroral Kilometric Radiation |
title_fullStr |
South Pole Station ground‐based and Cluster satellite measurements of leaked and escaping Auroral Kilometric Radiation |
title_full_unstemmed |
South Pole Station ground‐based and Cluster satellite measurements of leaked and escaping Auroral Kilometric Radiation |
title_sort |
south pole station ground‐based and cluster satellite measurements of leaked and escaping auroral kilometric radiation |
publisher |
American Geophysical Union (AGU) |
publishDate |
2022 |
url |
https://eprints.whiterose.ac.uk/183355/ https://eprints.whiterose.ac.uk/183355/1/JGR%20Space%20Physics%20-%202022%20-%20LaBelle%20-%20South%20Pole%20Station%20Ground%E2%80%90Based%20and%20Cluster%20Satellite%20Measurements%20of%20Leaked%20and.pdf |
geographic |
South Pole |
geographic_facet |
South Pole |
genre |
Antarc* Antarctica South pole South pole |
genre_facet |
Antarc* Antarctica South pole South pole |
op_relation |
https://eprints.whiterose.ac.uk/183355/1/JGR%20Space%20Physics%20-%202022%20-%20LaBelle%20-%20South%20Pole%20Station%20Ground%E2%80%90Based%20and%20Cluster%20Satellite%20Measurements%20of%20Leaked%20and.pdf LaBelle, J., Yearby, K. orcid.org/0000-0002-7605-4393 and Pickett, J.S. (2022) South Pole Station ground‐based and Cluster satellite measurements of leaked and escaping Auroral Kilometric Radiation. Journal of Geophysical Research: Space Physics, 127 (2). e2021JA029399. ISSN 2169-9380 |
_version_ |
1766262745263505408 |