Interhemispheric asymmetry of large‐scale electron density gradients in the polar cap ionosphere: UT and seasonal variations
The high‐latitude ionosphere is highly dynamical with significant irregularities and density gradients. However, the spatial and temporal distributions of density gradients and irregularities are very different between the Arctic and Antarctic. In this report, we study the interhemispheric asymmetry...
Published in: | Journal of Geophysical Research: Space Physics |
---|---|
Main Authors: | , |
Format: | Article in Journal/Newspaper |
Language: | English |
Published: |
2020
|
Subjects: | |
Online Access: | http://hdl.handle.net/10852/83976 http://urn.nb.no/URN:NBN:no-86703 https://doi.org/10.1029/2019JA027601 |
id |
ftoslouniv:oai:www.duo.uio.no:10852/83976 |
---|---|
record_format |
openpolar |
spelling |
ftoslouniv:oai:www.duo.uio.no:10852/83976 2023-05-15T14:02:31+02:00 Interhemispheric asymmetry of large‐scale electron density gradients in the polar cap ionosphere: UT and seasonal variations Jin, Yaqi Xiong, Chao 2020-12-14T12:06:17Z http://hdl.handle.net/10852/83976 http://urn.nb.no/URN:NBN:no-86703 https://doi.org/10.1029/2019JA027601 EN eng http://urn.nb.no/URN:NBN:no-86703 Jin, Yaqi Xiong, Chao . Interhemispheric asymmetry of large‐scale electron density gradients in the polar cap ionosphere: UT and seasonal variations. Journal of Geophysical Research (JGR): Space Physics. 2020, 125(2) http://hdl.handle.net/10852/83976 1859476 info:ofi/fmt:kev:mtx:ctx&ctx_ver=Z39.88-2004&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.jtitle=Journal of Geophysical Research (JGR): Space Physics&rft.volume=125&rft.spage=&rft.date=2020 Journal of Geophysical Research (JGR): Space Physics 125 2 10 https://doi.org/10.1029/2019JA027601 URN:NBN:no-86703 Fulltext https://www.duo.uio.no/bitstream/handle/10852/83976/2/2019JA027601.pdf Attribution 4.0 International https://creativecommons.org/licenses/by/4.0/ CC-BY 2169-9380 Journal article Tidsskriftartikkel Peer reviewed PublishedVersion 2020 ftoslouniv https://doi.org/10.1029/2019JA027601 2021-03-17T23:31:00Z The high‐latitude ionosphere is highly dynamical with significant irregularities and density gradients. However, the spatial and temporal distributions of density gradients and irregularities are very different between the Arctic and Antarctic. In this report, we study the interhemispheric asymmetry of the large‐scale (100 km) density gradients in both polar caps. Our results show that density gradients in the Arctic are enhanced during local winter (December solstice) with a peak around 19 UT. The UT and spatial distributions in the Antarctic local winter (June solstice) are similar to the Arctic except that they are reversed by 12 hr, which indicates a mirror symmetry between hemispheres. The 12‐hr difference in the peak density gradients can be explained by the displacements between the geographic and geomagnetic poles. The only asymmetry (anomaly) is the persistence of strong density gradients in the southern polar cap during local summer (December solstice). Article in Journal/Newspaper Antarc* Antarctic Arctic Universitet i Oslo: Digitale utgivelser ved UiO (DUO) Antarctic Arctic The Antarctic Journal of Geophysical Research: Space Physics 125 2 |
institution |
Open Polar |
collection |
Universitet i Oslo: Digitale utgivelser ved UiO (DUO) |
op_collection_id |
ftoslouniv |
language |
English |
description |
The high‐latitude ionosphere is highly dynamical with significant irregularities and density gradients. However, the spatial and temporal distributions of density gradients and irregularities are very different between the Arctic and Antarctic. In this report, we study the interhemispheric asymmetry of the large‐scale (100 km) density gradients in both polar caps. Our results show that density gradients in the Arctic are enhanced during local winter (December solstice) with a peak around 19 UT. The UT and spatial distributions in the Antarctic local winter (June solstice) are similar to the Arctic except that they are reversed by 12 hr, which indicates a mirror symmetry between hemispheres. The 12‐hr difference in the peak density gradients can be explained by the displacements between the geographic and geomagnetic poles. The only asymmetry (anomaly) is the persistence of strong density gradients in the southern polar cap during local summer (December solstice). |
format |
Article in Journal/Newspaper |
author |
Jin, Yaqi Xiong, Chao |
spellingShingle |
Jin, Yaqi Xiong, Chao Interhemispheric asymmetry of large‐scale electron density gradients in the polar cap ionosphere: UT and seasonal variations |
author_facet |
Jin, Yaqi Xiong, Chao |
author_sort |
Jin, Yaqi |
title |
Interhemispheric asymmetry of large‐scale electron density gradients in the polar cap ionosphere: UT and seasonal variations |
title_short |
Interhemispheric asymmetry of large‐scale electron density gradients in the polar cap ionosphere: UT and seasonal variations |
title_full |
Interhemispheric asymmetry of large‐scale electron density gradients in the polar cap ionosphere: UT and seasonal variations |
title_fullStr |
Interhemispheric asymmetry of large‐scale electron density gradients in the polar cap ionosphere: UT and seasonal variations |
title_full_unstemmed |
Interhemispheric asymmetry of large‐scale electron density gradients in the polar cap ionosphere: UT and seasonal variations |
title_sort |
interhemispheric asymmetry of large‐scale electron density gradients in the polar cap ionosphere: ut and seasonal variations |
publishDate |
2020 |
url |
http://hdl.handle.net/10852/83976 http://urn.nb.no/URN:NBN:no-86703 https://doi.org/10.1029/2019JA027601 |
geographic |
Antarctic Arctic The Antarctic |
geographic_facet |
Antarctic Arctic The Antarctic |
genre |
Antarc* Antarctic Arctic |
genre_facet |
Antarc* Antarctic Arctic |
op_source |
2169-9380 |
op_relation |
http://urn.nb.no/URN:NBN:no-86703 Jin, Yaqi Xiong, Chao . Interhemispheric asymmetry of large‐scale electron density gradients in the polar cap ionosphere: UT and seasonal variations. Journal of Geophysical Research (JGR): Space Physics. 2020, 125(2) http://hdl.handle.net/10852/83976 1859476 info:ofi/fmt:kev:mtx:ctx&ctx_ver=Z39.88-2004&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.jtitle=Journal of Geophysical Research (JGR): Space Physics&rft.volume=125&rft.spage=&rft.date=2020 Journal of Geophysical Research (JGR): Space Physics 125 2 10 https://doi.org/10.1029/2019JA027601 URN:NBN:no-86703 Fulltext https://www.duo.uio.no/bitstream/handle/10852/83976/2/2019JA027601.pdf |
op_rights |
Attribution 4.0 International https://creativecommons.org/licenses/by/4.0/ |
op_rightsnorm |
CC-BY |
op_doi |
https://doi.org/10.1029/2019JA027601 |
container_title |
Journal of Geophysical Research: Space Physics |
container_volume |
125 |
container_issue |
2 |
_version_ |
1766272836310138880 |