Characterization of gravity waves in the lower ionosphere using very low frequency observations at Comandante Ferraz Brazilian Antarctic Station
The goal of this work is to investigate the gravity wave (GW) characteristics in the low ionosphere using very low frequency (VLF) radio signals. The spatial modulations produced by the GWs affect the conditions of the electron density at reflection height of the VLF signals, which produce fluctuati...
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ftdoajarticles:oai:doaj.org/article:471d9432b8c7444591488cac407c52ec 2023-05-15T13:57:01+02:00 Characterization of gravity waves in the lower ionosphere using very low frequency observations at Comandante Ferraz Brazilian Antarctic Station E. Correia L. T. M. Raunheitte J. V. Bageston D. E. D'Amico 2020-03-01T00:00:00Z https://doi.org/10.5194/angeo-38-385-2020 https://doaj.org/article/471d9432b8c7444591488cac407c52ec EN eng Copernicus Publications https://www.ann-geophys.net/38/385/2020/angeo-38-385-2020.pdf https://doaj.org/toc/0992-7689 https://doaj.org/toc/1432-0576 doi:10.5194/angeo-38-385-2020 0992-7689 1432-0576 https://doaj.org/article/471d9432b8c7444591488cac407c52ec Annales Geophysicae, Vol 38, Pp 385-394 (2020) Science Q Physics QC1-999 Geophysics. Cosmic physics QC801-809 article 2020 ftdoajarticles https://doi.org/10.5194/angeo-38-385-2020 2022-12-31T05:28:18Z The goal of this work is to investigate the gravity wave (GW) characteristics in the low ionosphere using very low frequency (VLF) radio signals. The spatial modulations produced by the GWs affect the conditions of the electron density at reflection height of the VLF signals, which produce fluctuations of the electrical conductivity in the D region that can be detected as variations in the amplitude and phase of VLF narrowband signals. The analysis considered the VLF signal transmitted from the US Cutler, Maine (NAA) station that was received at Comandante Ferraz Brazilian Antarctic Station (EACF, 62.1 ∘ S, 58.4 ∘ W), with its great circle path crossing the Drake Passage longitudinally. The wave periods of the GWs detected in the low ionosphere are obtained using the wavelet analysis applied to the VLF amplitude. Here the VLF technique was used as a new aspect for monitoring GW activity. It was validated comparing the wave period and duration properties of one GW event observed simultaneously with a co-located airglow all-sky imager both operating at EACF. The statistical analysis of the seasonal variation of the wave periods detected using VLF technique for 2007 showed that the GW events occurred all observed days, with the waves with a period between 5 and 10 min dominating during night hours from May to September, while during daytime hours the waves with a period between 0 and 5 min are predominant the whole year and dominate all days from November to April. These results show that VLF technique is a powerful tool to obtain the wave period and duration of GW events in the low ionosphere, with the advantage of being independent of sky conditions, and it can be used during the whole day and year-round. Article in Journal/Newspaper Antarc* Antarctic Drake Passage Directory of Open Access Journals: DOAJ Articles Antarctic Cutler ENVELOPE(-60.981,-60.981,-62.612,-62.612) Drake Passage Ferraz ENVELOPE(-64.117,-64.117,-65.117,-65.117) Annales Geophysicae 38 2 385 394 |
institution |
Open Polar |
collection |
Directory of Open Access Journals: DOAJ Articles |
op_collection_id |
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language |
English |
topic |
Science Q Physics QC1-999 Geophysics. Cosmic physics QC801-809 |
spellingShingle |
Science Q Physics QC1-999 Geophysics. Cosmic physics QC801-809 E. Correia L. T. M. Raunheitte J. V. Bageston D. E. D'Amico Characterization of gravity waves in the lower ionosphere using very low frequency observations at Comandante Ferraz Brazilian Antarctic Station |
topic_facet |
Science Q Physics QC1-999 Geophysics. Cosmic physics QC801-809 |
description |
The goal of this work is to investigate the gravity wave (GW) characteristics in the low ionosphere using very low frequency (VLF) radio signals. The spatial modulations produced by the GWs affect the conditions of the electron density at reflection height of the VLF signals, which produce fluctuations of the electrical conductivity in the D region that can be detected as variations in the amplitude and phase of VLF narrowband signals. The analysis considered the VLF signal transmitted from the US Cutler, Maine (NAA) station that was received at Comandante Ferraz Brazilian Antarctic Station (EACF, 62.1 ∘ S, 58.4 ∘ W), with its great circle path crossing the Drake Passage longitudinally. The wave periods of the GWs detected in the low ionosphere are obtained using the wavelet analysis applied to the VLF amplitude. Here the VLF technique was used as a new aspect for monitoring GW activity. It was validated comparing the wave period and duration properties of one GW event observed simultaneously with a co-located airglow all-sky imager both operating at EACF. The statistical analysis of the seasonal variation of the wave periods detected using VLF technique for 2007 showed that the GW events occurred all observed days, with the waves with a period between 5 and 10 min dominating during night hours from May to September, while during daytime hours the waves with a period between 0 and 5 min are predominant the whole year and dominate all days from November to April. These results show that VLF technique is a powerful tool to obtain the wave period and duration of GW events in the low ionosphere, with the advantage of being independent of sky conditions, and it can be used during the whole day and year-round. |
format |
Article in Journal/Newspaper |
author |
E. Correia L. T. M. Raunheitte J. V. Bageston D. E. D'Amico |
author_facet |
E. Correia L. T. M. Raunheitte J. V. Bageston D. E. D'Amico |
author_sort |
E. Correia |
title |
Characterization of gravity waves in the lower ionosphere using very low frequency observations at Comandante Ferraz Brazilian Antarctic Station |
title_short |
Characterization of gravity waves in the lower ionosphere using very low frequency observations at Comandante Ferraz Brazilian Antarctic Station |
title_full |
Characterization of gravity waves in the lower ionosphere using very low frequency observations at Comandante Ferraz Brazilian Antarctic Station |
title_fullStr |
Characterization of gravity waves in the lower ionosphere using very low frequency observations at Comandante Ferraz Brazilian Antarctic Station |
title_full_unstemmed |
Characterization of gravity waves in the lower ionosphere using very low frequency observations at Comandante Ferraz Brazilian Antarctic Station |
title_sort |
characterization of gravity waves in the lower ionosphere using very low frequency observations at comandante ferraz brazilian antarctic station |
publisher |
Copernicus Publications |
publishDate |
2020 |
url |
https://doi.org/10.5194/angeo-38-385-2020 https://doaj.org/article/471d9432b8c7444591488cac407c52ec |
long_lat |
ENVELOPE(-60.981,-60.981,-62.612,-62.612) ENVELOPE(-64.117,-64.117,-65.117,-65.117) |
geographic |
Antarctic Cutler Drake Passage Ferraz |
geographic_facet |
Antarctic Cutler Drake Passage Ferraz |
genre |
Antarc* Antarctic Drake Passage |
genre_facet |
Antarc* Antarctic Drake Passage |
op_source |
Annales Geophysicae, Vol 38, Pp 385-394 (2020) |
op_relation |
https://www.ann-geophys.net/38/385/2020/angeo-38-385-2020.pdf https://doaj.org/toc/0992-7689 https://doaj.org/toc/1432-0576 doi:10.5194/angeo-38-385-2020 0992-7689 1432-0576 https://doaj.org/article/471d9432b8c7444591488cac407c52ec |
op_doi |
https://doi.org/10.5194/angeo-38-385-2020 |
container_title |
Annales Geophysicae |
container_volume |
38 |
container_issue |
2 |
container_start_page |
385 |
op_container_end_page |
394 |
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1766264625793335296 |