The effect of ozone shadowing on the D region ionosphere during sunrise
Diurnal very low frequency (VLF) sub‐ionospheric radiowave phase measurements show a night‐to‐day transition pattern. During this sunrise transition a phase perturbation, which consist of a phase overshoot followed by a small phase recovery to normal daytime values, is often observed. The variabilit...
Published in: | Journal of Geophysical Research: Space Physics |
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American Geophysical Union
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Online Access: | http://nora.nerc.ac.uk/id/eprint/523174/ https://nora.nerc.ac.uk/id/eprint/523174/1/Macotela_et_al-2019-Journal_of_Geophysical_Research__Space_Physics.pdf https://doi.org/10.1029/2018JA026415 |
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ftnerc:oai:nora.nerc.ac.uk:523174 2023-05-15T18:20:17+02:00 The effect of ozone shadowing on the D region ionosphere during sunrise Macotela, Edith L. Clilverd, Mark A. Manninen, Jyrki Thomson, Neil R. Newnham, David A. Raita, Tero 2019-05 text http://nora.nerc.ac.uk/id/eprint/523174/ https://nora.nerc.ac.uk/id/eprint/523174/1/Macotela_et_al-2019-Journal_of_Geophysical_Research__Space_Physics.pdf https://doi.org/10.1029/2018JA026415 en eng American Geophysical Union https://nora.nerc.ac.uk/id/eprint/523174/1/Macotela_et_al-2019-Journal_of_Geophysical_Research__Space_Physics.pdf Macotela, Edith L.; Clilverd, Mark A. orcid:0000-0002-7388-1529 Manninen, Jyrki; Thomson, Neil R.; Newnham, David A. orcid:0000-0001-8422-1289 Raita, Tero. 2019 The effect of ozone shadowing on the D region ionosphere during sunrise. Journal of Geophysical Research: Space Physics, 124 (5). 3729-3742. https://doi.org/10.1029/2018JA026415 <https://doi.org/10.1029/2018JA026415> Publication - Article PeerReviewed 2019 ftnerc https://doi.org/10.1029/2018JA026415 2023-02-04T19:48:15Z Diurnal very low frequency (VLF) sub‐ionospheric radiowave phase measurements show a night‐to‐day transition pattern. During this sunrise transition a phase perturbation, which consist of a phase overshoot followed by a small phase recovery to normal daytime values, is often observed. The variability of the size of this sunrise phase perturbation, and its maximum and end times were monitored to identify the associated physical causes. VLF signal from the 22.1 kHz UK transmitter (call sign GVT) recorded at Sodankylä, Finland, from 20 April 2010 until 31 December 2016 were used. The timing at the maximum of the phase perturbation period, has an annual pattern that is well described by the seasonal variation of the sunrise time 28 km above the transmitter. Variations in ozone number density at 38–42 km altitudes are better correlated (R = 0.7) with the sunrise phase perturbation variability than at any other altitudes below ~80 km, and exhibit higher correlation values than for atmospheric temperature. Our results show that the main characteristics of the observed VLF sunrise phase perturbation arise from shadowing of short wavelength solar UV flux from the D‐region ionosphere due to stratospheric ozone absorption. Article in Journal/Newspaper Sodankylä Natural Environment Research Council: NERC Open Research Archive Sodankylä ENVELOPE(26.600,26.600,67.417,67.417) Journal of Geophysical Research: Space Physics 124 5 3729 3742 |
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Open Polar |
collection |
Natural Environment Research Council: NERC Open Research Archive |
op_collection_id |
ftnerc |
language |
English |
description |
Diurnal very low frequency (VLF) sub‐ionospheric radiowave phase measurements show a night‐to‐day transition pattern. During this sunrise transition a phase perturbation, which consist of a phase overshoot followed by a small phase recovery to normal daytime values, is often observed. The variability of the size of this sunrise phase perturbation, and its maximum and end times were monitored to identify the associated physical causes. VLF signal from the 22.1 kHz UK transmitter (call sign GVT) recorded at Sodankylä, Finland, from 20 April 2010 until 31 December 2016 were used. The timing at the maximum of the phase perturbation period, has an annual pattern that is well described by the seasonal variation of the sunrise time 28 km above the transmitter. Variations in ozone number density at 38–42 km altitudes are better correlated (R = 0.7) with the sunrise phase perturbation variability than at any other altitudes below ~80 km, and exhibit higher correlation values than for atmospheric temperature. Our results show that the main characteristics of the observed VLF sunrise phase perturbation arise from shadowing of short wavelength solar UV flux from the D‐region ionosphere due to stratospheric ozone absorption. |
format |
Article in Journal/Newspaper |
author |
Macotela, Edith L. Clilverd, Mark A. Manninen, Jyrki Thomson, Neil R. Newnham, David A. Raita, Tero |
spellingShingle |
Macotela, Edith L. Clilverd, Mark A. Manninen, Jyrki Thomson, Neil R. Newnham, David A. Raita, Tero The effect of ozone shadowing on the D region ionosphere during sunrise |
author_facet |
Macotela, Edith L. Clilverd, Mark A. Manninen, Jyrki Thomson, Neil R. Newnham, David A. Raita, Tero |
author_sort |
Macotela, Edith L. |
title |
The effect of ozone shadowing on the D region ionosphere during sunrise |
title_short |
The effect of ozone shadowing on the D region ionosphere during sunrise |
title_full |
The effect of ozone shadowing on the D region ionosphere during sunrise |
title_fullStr |
The effect of ozone shadowing on the D region ionosphere during sunrise |
title_full_unstemmed |
The effect of ozone shadowing on the D region ionosphere during sunrise |
title_sort |
effect of ozone shadowing on the d region ionosphere during sunrise |
publisher |
American Geophysical Union |
publishDate |
2019 |
url |
http://nora.nerc.ac.uk/id/eprint/523174/ https://nora.nerc.ac.uk/id/eprint/523174/1/Macotela_et_al-2019-Journal_of_Geophysical_Research__Space_Physics.pdf https://doi.org/10.1029/2018JA026415 |
long_lat |
ENVELOPE(26.600,26.600,67.417,67.417) |
geographic |
Sodankylä |
geographic_facet |
Sodankylä |
genre |
Sodankylä |
genre_facet |
Sodankylä |
op_relation |
https://nora.nerc.ac.uk/id/eprint/523174/1/Macotela_et_al-2019-Journal_of_Geophysical_Research__Space_Physics.pdf Macotela, Edith L.; Clilverd, Mark A. orcid:0000-0002-7388-1529 Manninen, Jyrki; Thomson, Neil R.; Newnham, David A. orcid:0000-0001-8422-1289 Raita, Tero. 2019 The effect of ozone shadowing on the D region ionosphere during sunrise. Journal of Geophysical Research: Space Physics, 124 (5). 3729-3742. https://doi.org/10.1029/2018JA026415 <https://doi.org/10.1029/2018JA026415> |
op_doi |
https://doi.org/10.1029/2018JA026415 |
container_title |
Journal of Geophysical Research: Space Physics |
container_volume |
124 |
container_issue |
5 |
container_start_page |
3729 |
op_container_end_page |
3742 |
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1766197786046365696 |