Electron Density Depletion Region Observed in the Polar Cap Ionosphere
This paper presents and discusses electron density depletion regions observed with the incoherent scatter EISCAT Svalbard Radar (ESR) located at 75.43°N geomagnetic latitude. The data include several decades of measurements, which make them suitable for studying statistical features and characterist...
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Online Access: | https://hdl.handle.net/10037/23876 https://doi.org/10.1029/2020JA028432 |
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ftunivtroemsoe:oai:munin.uit.no:10037/23876 2023-11-12T04:16:37+01:00 Electron Density Depletion Region Observed in the Polar Cap Ionosphere Bjoland, Lindis Merete Ogawa, Y. Løvhaug, Unni Pia Lorentzen, Dag Arne Hatch, Spencer Mark Oksavik, Kjellmar 2021-12-16 https://hdl.handle.net/10037/23876 https://doi.org/10.1029/2020JA028432 eng eng Wiley This article is partly based on the submitted manuscript in the following publication: Bjoland, L.M. (2018). Radar studies of plasma parameters in the polar cap and the auroral zone (Doctoral thesis). https://hdl.handle.net/10037/31573 . Journal of Geophysical Research (JGR): Space Physics Norges forskningsråd: 223252 info:eu-repo/grantAgreement/RCN/SFF/223252/Norway/Birkeland Center for Space Science/BCSS/ https://doi.org/10.1029/2020JA028432 Bjoland, Ogawa, Løvhaug, Lorentzen, Hatch, Oksavik. Electron Density Depletion Region Observed in the Polar Cap Ionosphere. Journal of Geophysical Research (JGR): Space Physics. 2021;126(1) FRIDAID 1977917 doi:10.1029/2020JA028432 2169-9380 2169-9402 https://hdl.handle.net/10037/23876 openAccess Copyright 2021 The Author(s) Journal article Tidsskriftartikkel Peer reviewed publishedVersion 2021 ftunivtroemsoe https://doi.org/10.1029/2020JA028432 2023-10-18T23:07:50Z This paper presents and discusses electron density depletion regions observed with the incoherent scatter EISCAT Svalbard Radar (ESR) located at 75.43°N geomagnetic latitude. The data include several decades of measurements, which make them suitable for studying statistical features and characteristics of the ionospheric parameters. Here we focus on the electron density depletions and their dependence on diurnal and seasonal variations and solar activity. An electron density depletion region is identified in the ESR data in the early morning sector. This depletion region seems to be clearest during equinox and winter and moderate/high solar activity. An enhancement in the ion temperature is often co-located with the electron density depletion region. The ion temperature enhancement could indicate that ion frictional heating is related to the electron density depletion region. However, during summer when the solar activity is low, the electron density depletion is not observed although the ion temperature is enhanced, suggesting that formation of the electron density depletion regions due to ion frictional heating may depend on the background effective temperature and O/N2 ratio. In addition, seasonal changes in the solar zenith angle could also contribute to the formation of the depletion region. Article in Journal/Newspaper EISCAT Svalbard University of Tromsø: Munin Open Research Archive Svalbard Journal of Geophysical Research: Space Physics 126 1 |
institution |
Open Polar |
collection |
University of Tromsø: Munin Open Research Archive |
op_collection_id |
ftunivtroemsoe |
language |
English |
description |
This paper presents and discusses electron density depletion regions observed with the incoherent scatter EISCAT Svalbard Radar (ESR) located at 75.43°N geomagnetic latitude. The data include several decades of measurements, which make them suitable for studying statistical features and characteristics of the ionospheric parameters. Here we focus on the electron density depletions and their dependence on diurnal and seasonal variations and solar activity. An electron density depletion region is identified in the ESR data in the early morning sector. This depletion region seems to be clearest during equinox and winter and moderate/high solar activity. An enhancement in the ion temperature is often co-located with the electron density depletion region. The ion temperature enhancement could indicate that ion frictional heating is related to the electron density depletion region. However, during summer when the solar activity is low, the electron density depletion is not observed although the ion temperature is enhanced, suggesting that formation of the electron density depletion regions due to ion frictional heating may depend on the background effective temperature and O/N2 ratio. In addition, seasonal changes in the solar zenith angle could also contribute to the formation of the depletion region. |
format |
Article in Journal/Newspaper |
author |
Bjoland, Lindis Merete Ogawa, Y. Løvhaug, Unni Pia Lorentzen, Dag Arne Hatch, Spencer Mark Oksavik, Kjellmar |
spellingShingle |
Bjoland, Lindis Merete Ogawa, Y. Løvhaug, Unni Pia Lorentzen, Dag Arne Hatch, Spencer Mark Oksavik, Kjellmar Electron Density Depletion Region Observed in the Polar Cap Ionosphere |
author_facet |
Bjoland, Lindis Merete Ogawa, Y. Løvhaug, Unni Pia Lorentzen, Dag Arne Hatch, Spencer Mark Oksavik, Kjellmar |
author_sort |
Bjoland, Lindis Merete |
title |
Electron Density Depletion Region Observed in the Polar Cap Ionosphere |
title_short |
Electron Density Depletion Region Observed in the Polar Cap Ionosphere |
title_full |
Electron Density Depletion Region Observed in the Polar Cap Ionosphere |
title_fullStr |
Electron Density Depletion Region Observed in the Polar Cap Ionosphere |
title_full_unstemmed |
Electron Density Depletion Region Observed in the Polar Cap Ionosphere |
title_sort |
electron density depletion region observed in the polar cap ionosphere |
publisher |
Wiley |
publishDate |
2021 |
url |
https://hdl.handle.net/10037/23876 https://doi.org/10.1029/2020JA028432 |
geographic |
Svalbard |
geographic_facet |
Svalbard |
genre |
EISCAT Svalbard |
genre_facet |
EISCAT Svalbard |
op_relation |
This article is partly based on the submitted manuscript in the following publication: Bjoland, L.M. (2018). Radar studies of plasma parameters in the polar cap and the auroral zone (Doctoral thesis). https://hdl.handle.net/10037/31573 . Journal of Geophysical Research (JGR): Space Physics Norges forskningsråd: 223252 info:eu-repo/grantAgreement/RCN/SFF/223252/Norway/Birkeland Center for Space Science/BCSS/ https://doi.org/10.1029/2020JA028432 Bjoland, Ogawa, Løvhaug, Lorentzen, Hatch, Oksavik. Electron Density Depletion Region Observed in the Polar Cap Ionosphere. Journal of Geophysical Research (JGR): Space Physics. 2021;126(1) FRIDAID 1977917 doi:10.1029/2020JA028432 2169-9380 2169-9402 https://hdl.handle.net/10037/23876 |
op_rights |
openAccess Copyright 2021 The Author(s) |
op_doi |
https://doi.org/10.1029/2020JA028432 |
container_title |
Journal of Geophysical Research: Space Physics |
container_volume |
126 |
container_issue |
1 |
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1782333693202792448 |