Quiet night Arctic ionospheric D region characteristics
VLF radio propagation recordings are used to determine the characteristics of the nighttime polar lower D region of the ionosphere. Recordings of both VLF phase and amplitude in the Arctic on days within ∼1‐2 weeks of the equinoxes enable their day‐to‐night changes to be determined. These changes ar...
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American Geophysical Union
2021
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ftnerc:oai:nora.nerc.ac.uk:530003 2023-05-15T14:25:53+02:00 Quiet night Arctic ionospheric D region characteristics Thomson, Neil R. Clilverd, Mark A. Brundell, James B. Rodger, Craig J. 2021-04-16 text http://nora.nerc.ac.uk/id/eprint/530003/ https://nora.nerc.ac.uk/id/eprint/530003/1/2020JA029043.pdf https://agupubs.onlinelibrary.wiley.com/doi/10.1029/2020JA029043 en eng American Geophysical Union https://nora.nerc.ac.uk/id/eprint/530003/1/2020JA029043.pdf Thomson, Neil R.; Clilverd, Mark A. orcid:0000-0002-7388-1529 Brundell, James B.; Rodger, Craig J. 2021 Quiet night Arctic ionospheric D region characteristics. Journal of Geophysical Research: Space Physics, 126 (4), e2020JA029043. 16, pp. https://doi.org/10.1029/2020JA029043 <https://doi.org/10.1029/2020JA029043> Publication - Article PeerReviewed 2021 ftnerc https://doi.org/10.1029/2020JA029043 2023-02-04T19:51:57Z VLF radio propagation recordings are used to determine the characteristics of the nighttime polar lower D region of the ionosphere. Recordings of both VLF phase and amplitude in the Arctic on days within ∼1‐2 weeks of the equinoxes enable their day‐to‐night changes to be determined. These changes are then combined with previously measured daytime polar D region characteristics to find the nighttime characteristics. The previously determined daytime characteristics were measured in the Arctic summer; the NRLMSISE atmosphere model is used to help determine the height change from daytime summer to daytime equinox (∼5 km lower). The principal path used was from the 16.4 kHz Norwegian transmitter JXN (67°N, 14°E) 1334 km northwards across the Arctic Ocean to Ny‐Ålesund (79°N, 12°E), Svalbard. Also used were the 2014‐km path from NRK (37.5 kHz, Grindavik, 64°N, Iceland) to Ny‐Ålesund, the 1655‐km path from JXN to Reykjavik (64°N, Iceland) and the 5302‐km path from JXN across the Arctic Ocean to Fairbanks (65°N) in Alaska. The night values of (the Wait parameters) H' and β were found to average from ∼79 km at equinox down to 77 km near winter solstice (lower than the 85 km at low and mid‐latitudes by ∼7 km) and 0.6 km‐1 respectively. This lower height and its variability are shown to be consistent with the principal source of ionization being energetic electron precipitation. Article in Journal/Newspaper Arctic Arctic Arctic Ocean Iceland Ny Ålesund Ny-Ålesund Svalbard Alaska Natural Environment Research Council: NERC Open Research Archive Arctic Arctic Ocean Fairbanks Ny-Ålesund Svalbard Journal of Geophysical Research: Space Physics 126 4 |
institution |
Open Polar |
collection |
Natural Environment Research Council: NERC Open Research Archive |
op_collection_id |
ftnerc |
language |
English |
description |
VLF radio propagation recordings are used to determine the characteristics of the nighttime polar lower D region of the ionosphere. Recordings of both VLF phase and amplitude in the Arctic on days within ∼1‐2 weeks of the equinoxes enable their day‐to‐night changes to be determined. These changes are then combined with previously measured daytime polar D region characteristics to find the nighttime characteristics. The previously determined daytime characteristics were measured in the Arctic summer; the NRLMSISE atmosphere model is used to help determine the height change from daytime summer to daytime equinox (∼5 km lower). The principal path used was from the 16.4 kHz Norwegian transmitter JXN (67°N, 14°E) 1334 km northwards across the Arctic Ocean to Ny‐Ålesund (79°N, 12°E), Svalbard. Also used were the 2014‐km path from NRK (37.5 kHz, Grindavik, 64°N, Iceland) to Ny‐Ålesund, the 1655‐km path from JXN to Reykjavik (64°N, Iceland) and the 5302‐km path from JXN across the Arctic Ocean to Fairbanks (65°N) in Alaska. The night values of (the Wait parameters) H' and β were found to average from ∼79 km at equinox down to 77 km near winter solstice (lower than the 85 km at low and mid‐latitudes by ∼7 km) and 0.6 km‐1 respectively. This lower height and its variability are shown to be consistent with the principal source of ionization being energetic electron precipitation. |
format |
Article in Journal/Newspaper |
author |
Thomson, Neil R. Clilverd, Mark A. Brundell, James B. Rodger, Craig J. |
spellingShingle |
Thomson, Neil R. Clilverd, Mark A. Brundell, James B. Rodger, Craig J. Quiet night Arctic ionospheric D region characteristics |
author_facet |
Thomson, Neil R. Clilverd, Mark A. Brundell, James B. Rodger, Craig J. |
author_sort |
Thomson, Neil R. |
title |
Quiet night Arctic ionospheric D region characteristics |
title_short |
Quiet night Arctic ionospheric D region characteristics |
title_full |
Quiet night Arctic ionospheric D region characteristics |
title_fullStr |
Quiet night Arctic ionospheric D region characteristics |
title_full_unstemmed |
Quiet night Arctic ionospheric D region characteristics |
title_sort |
quiet night arctic ionospheric d region characteristics |
publisher |
American Geophysical Union |
publishDate |
2021 |
url |
http://nora.nerc.ac.uk/id/eprint/530003/ https://nora.nerc.ac.uk/id/eprint/530003/1/2020JA029043.pdf https://agupubs.onlinelibrary.wiley.com/doi/10.1029/2020JA029043 |
geographic |
Arctic Arctic Ocean Fairbanks Ny-Ålesund Svalbard |
geographic_facet |
Arctic Arctic Ocean Fairbanks Ny-Ålesund Svalbard |
genre |
Arctic Arctic Arctic Ocean Iceland Ny Ålesund Ny-Ålesund Svalbard Alaska |
genre_facet |
Arctic Arctic Arctic Ocean Iceland Ny Ålesund Ny-Ålesund Svalbard Alaska |
op_relation |
https://nora.nerc.ac.uk/id/eprint/530003/1/2020JA029043.pdf Thomson, Neil R.; Clilverd, Mark A. orcid:0000-0002-7388-1529 Brundell, James B.; Rodger, Craig J. 2021 Quiet night Arctic ionospheric D region characteristics. Journal of Geophysical Research: Space Physics, 126 (4), e2020JA029043. 16, pp. https://doi.org/10.1029/2020JA029043 <https://doi.org/10.1029/2020JA029043> |
op_doi |
https://doi.org/10.1029/2020JA029043 |
container_title |
Journal of Geophysical Research: Space Physics |
container_volume |
126 |
container_issue |
4 |
_version_ |
1766298370915172352 |