D-region high latitude forcing factors
The subionospheric very low frequency (VLF) radio wave technique provides the possibility of investigating the response of the ionospheric D‐region to a diversity of transient and long‐term physical phenomena originating from above (e.g., energetic particle precipitation) and from below (e.g., atmos...
Published in: | Journal of Geophysical Research: Space Physics |
---|---|
Main Authors: | , , , , , , |
Format: | Article in Journal/Newspaper |
Language: | English |
Published: |
American Geophysical Union
2019
|
Subjects: | |
Online Access: | http://nora.nerc.ac.uk/id/eprint/520881/ https://nora.nerc.ac.uk/id/eprint/520881/1/Macotela_et_al-2019-Journal_of_Geophysical_Research__Space_Physics.pdf https://doi.org/10.1029/2018JA026049 |
id |
ftnerc:oai:nora.nerc.ac.uk:520881 |
---|---|
record_format |
openpolar |
spelling |
ftnerc:oai:nora.nerc.ac.uk:520881 2023-05-15T18:20:17+02:00 D-region high latitude forcing factors Macotela, Edith L Clilverd, Mark Manninen, Jyrki Moffat-Griffin, Tracy Newnham, David A. Raita, Tero Rodger, Craig J 2019-01 text http://nora.nerc.ac.uk/id/eprint/520881/ https://nora.nerc.ac.uk/id/eprint/520881/1/Macotela_et_al-2019-Journal_of_Geophysical_Research__Space_Physics.pdf https://doi.org/10.1029/2018JA026049 en eng American Geophysical Union https://nora.nerc.ac.uk/id/eprint/520881/1/Macotela_et_al-2019-Journal_of_Geophysical_Research__Space_Physics.pdf Macotela, Edith L; Clilverd, Mark orcid:0000-0002-7388-1529 Manninen, Jyrki; Moffat-Griffin, Tracy orcid:0000-0002-9670-6715 Newnham, David A. orcid:0000-0001-8422-1289 Raita, Tero; Rodger, Craig J. 2019 D-region high latitude forcing factors. Journal of Geophysical Research: Space Physics, 124 (1). 765-781. https://doi.org/10.1029/2018JA026049 <https://doi.org/10.1029/2018JA026049> Publication - Article PeerReviewed 2019 ftnerc https://doi.org/10.1029/2018JA026049 2023-02-04T19:47:02Z The subionospheric very low frequency (VLF) radio wave technique provides the possibility of investigating the response of the ionospheric D‐region to a diversity of transient and long‐term physical phenomena originating from above (e.g., energetic particle precipitation) and from below (e.g., atmospheric waves). In this study, we identify the periodicities that appear in VLF measurements and investigate how they may be related to changes in space weather and atmospheric activity. The powerful VLF signal transmitted from NAA (24 kHz) on the east coast of the USA, and received at Sodankylä, Finland, was analyzed. Wavelet transform, wavelet power spectrum, wavelet coherence, and cross‐wavelet spectrum were computed for daily averages of selected ionospheric, space weather, and atmospheric parameters from November 2008 until June 2018. Our results show that the significant VLF periods that appear during solar cycle 24 are the annual oscillation (AO), semiannual oscillation (SAO), 121‐day, 86‐day, 61‐day, and solar rotation oscillations. We found that the AO corresponds to variability in mesospheric temperature and solar Lyman‐α (Ly‐α) flux and the SAO to variability in space weather‐related parameters. The solar rotation oscillation observed in the VLF variability is mainly related to the Ly‐α flux variation at solar maximum, and to geomagnetic activity variation during the declining phase of the solar cycle. Our results are important since they strengthen our understanding of the Earth's D‐region response to solar and atmospheric forcing. 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 1 765 781 |
institution |
Open Polar |
collection |
Natural Environment Research Council: NERC Open Research Archive |
op_collection_id |
ftnerc |
language |
English |
description |
The subionospheric very low frequency (VLF) radio wave technique provides the possibility of investigating the response of the ionospheric D‐region to a diversity of transient and long‐term physical phenomena originating from above (e.g., energetic particle precipitation) and from below (e.g., atmospheric waves). In this study, we identify the periodicities that appear in VLF measurements and investigate how they may be related to changes in space weather and atmospheric activity. The powerful VLF signal transmitted from NAA (24 kHz) on the east coast of the USA, and received at Sodankylä, Finland, was analyzed. Wavelet transform, wavelet power spectrum, wavelet coherence, and cross‐wavelet spectrum were computed for daily averages of selected ionospheric, space weather, and atmospheric parameters from November 2008 until June 2018. Our results show that the significant VLF periods that appear during solar cycle 24 are the annual oscillation (AO), semiannual oscillation (SAO), 121‐day, 86‐day, 61‐day, and solar rotation oscillations. We found that the AO corresponds to variability in mesospheric temperature and solar Lyman‐α (Ly‐α) flux and the SAO to variability in space weather‐related parameters. The solar rotation oscillation observed in the VLF variability is mainly related to the Ly‐α flux variation at solar maximum, and to geomagnetic activity variation during the declining phase of the solar cycle. Our results are important since they strengthen our understanding of the Earth's D‐region response to solar and atmospheric forcing. |
format |
Article in Journal/Newspaper |
author |
Macotela, Edith L Clilverd, Mark Manninen, Jyrki Moffat-Griffin, Tracy Newnham, David A. Raita, Tero Rodger, Craig J |
spellingShingle |
Macotela, Edith L Clilverd, Mark Manninen, Jyrki Moffat-Griffin, Tracy Newnham, David A. Raita, Tero Rodger, Craig J D-region high latitude forcing factors |
author_facet |
Macotela, Edith L Clilverd, Mark Manninen, Jyrki Moffat-Griffin, Tracy Newnham, David A. Raita, Tero Rodger, Craig J |
author_sort |
Macotela, Edith L |
title |
D-region high latitude forcing factors |
title_short |
D-region high latitude forcing factors |
title_full |
D-region high latitude forcing factors |
title_fullStr |
D-region high latitude forcing factors |
title_full_unstemmed |
D-region high latitude forcing factors |
title_sort |
d-region high latitude forcing factors |
publisher |
American Geophysical Union |
publishDate |
2019 |
url |
http://nora.nerc.ac.uk/id/eprint/520881/ https://nora.nerc.ac.uk/id/eprint/520881/1/Macotela_et_al-2019-Journal_of_Geophysical_Research__Space_Physics.pdf https://doi.org/10.1029/2018JA026049 |
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/520881/1/Macotela_et_al-2019-Journal_of_Geophysical_Research__Space_Physics.pdf Macotela, Edith L; Clilverd, Mark orcid:0000-0002-7388-1529 Manninen, Jyrki; Moffat-Griffin, Tracy orcid:0000-0002-9670-6715 Newnham, David A. orcid:0000-0001-8422-1289 Raita, Tero; Rodger, Craig J. 2019 D-region high latitude forcing factors. Journal of Geophysical Research: Space Physics, 124 (1). 765-781. https://doi.org/10.1029/2018JA026049 <https://doi.org/10.1029/2018JA026049> |
op_doi |
https://doi.org/10.1029/2018JA026049 |
container_title |
Journal of Geophysical Research: Space Physics |
container_volume |
124 |
container_issue |
1 |
container_start_page |
765 |
op_container_end_page |
781 |
_version_ |
1766197802850844672 |