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 |
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Language: | English |
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2020
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ftgfzpotsdam:oai:gfzpublic.gfz-potsdam.de:item_5000646 2023-05-15T14:02:23+02:00 Interhemispheric Asymmetry of Large‐Scale Electron Density Gradients in the Polar Cap Ionosphere: UT and Seasonal Variations. Jin, Y. Xiong, C. 2020 application/pdf https://gfzpublic.gfz-potsdam.de/pubman/item/item_5000646 https://gfzpublic.gfz-potsdam.de/pubman/item/item_5000646_2/component/file_5000717/5000646.pdf eng eng info:eu-repo/semantics/altIdentifier/doi/10.1029/2019JA027601 https://gfzpublic.gfz-potsdam.de/pubman/item/item_5000646 https://gfzpublic.gfz-potsdam.de/pubman/item/item_5000646_2/component/file_5000717/5000646.pdf info:eu-repo/semantics/openAccess https://creativecommons.org/licenses/by/4.0/ CC-BY Journal of Geophysical Research: Space Physics info:eu-repo/semantics/article 2020 ftgfzpotsdam https://doi.org/10.1029/2019JA027601 2022-09-14T05:57:31Z 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 GFZpublic (German Research Centre for Geosciences, Helmholtz-Zentrum Potsdam) Arctic Antarctic The Antarctic Journal of Geophysical Research: Space Physics 125 2 |
institution |
Open Polar |
collection |
GFZpublic (German Research Centre for Geosciences, Helmholtz-Zentrum Potsdam) |
op_collection_id |
ftgfzpotsdam |
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, Y. Xiong, C. |
spellingShingle |
Jin, Y. Xiong, C. Interhemispheric Asymmetry of Large‐Scale Electron Density Gradients in the Polar Cap Ionosphere: UT and Seasonal Variations. |
author_facet |
Jin, Y. Xiong, C. |
author_sort |
Jin, Y. |
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 |
https://gfzpublic.gfz-potsdam.de/pubman/item/item_5000646 https://gfzpublic.gfz-potsdam.de/pubman/item/item_5000646_2/component/file_5000717/5000646.pdf |
geographic |
Arctic Antarctic The Antarctic |
geographic_facet |
Arctic Antarctic The Antarctic |
genre |
Antarc* Antarctic Arctic |
genre_facet |
Antarc* Antarctic Arctic |
op_source |
Journal of Geophysical Research: Space Physics |
op_relation |
info:eu-repo/semantics/altIdentifier/doi/10.1029/2019JA027601 https://gfzpublic.gfz-potsdam.de/pubman/item/item_5000646 https://gfzpublic.gfz-potsdam.de/pubman/item/item_5000646_2/component/file_5000717/5000646.pdf |
op_rights |
info:eu-repo/semantics/openAccess 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_ |
1766272655005057024 |