On the determination of lower ionospheric perturbations detected as fast amplitude variations of VLF signals
We analyze the occurrence of very low frequency (VLF) events and their association with geomagnetic activity. VLF events are detected as fast amplitude variations of VLF signals from Hawaii (NPM Navy transmitter) and received at Comandante Ferraz Brazilian Antarctic Station (EACF) in the period from...
Main Authors: | , , |
---|---|
Format: | Article in Journal/Newspaper |
Language: | Portuguese |
Published: |
Associação Brasileira de Ciência Ecológica e Conservação
2017
|
Subjects: | |
Online Access: | https://revistas.ufrj.br/index.php/oa/article/view/8056 |
id |
ftjob:oai:www.revistas.ufrj.br:article/8056 |
---|---|
record_format |
openpolar |
spelling |
ftjob:oai:www.revistas.ufrj.br:article/8056 2023-05-15T13:59:31+02:00 On the determination of lower ionospheric perturbations detected as fast amplitude variations of VLF signals DETERMINAÇÃO DAS PERTURBAÇÕES DA BAIXA IONOSFERA DETECTADAS COMO VARIAÇÕES RÁPIDAS DOS SINAIS VLF. Correia, Emília Fernandez, José Henrique Raulin, Jean Pierre 2017-02-20 application/pdf https://revistas.ufrj.br/index.php/oa/article/view/8056 por por Associação Brasileira de Ciência Ecológica e Conservação https://revistas.ufrj.br/index.php/oa/article/view/8056/6500 https://revistas.ufrj.br/index.php/oa/article/view/8056 Copyright (c) 2017 Oecologia Australis http://creativecommons.org/licenses/by-nc/4.0 CC-BY-NC Oecologia Australis; Vol 11, No 1 (2007): Oecologia Brasiliensis - Ecologia Antártica; 23-28 2177-6199 Ionosphere particle precipitation geomagnetic storms Ionosfera precipitação de partículas tempestades geomagnéticas info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion 2017 ftjob 2021-12-19T13:30:00Z We analyze the occurrence of very low frequency (VLF) events and their association with geomagnetic activity. VLF events are detected as fast amplitude variations of VLF signals from Hawaii (NPM Navy transmitter) and received at Comandante Ferraz Brazilian Antarctic Station (EACF) in the period from September through November 2003. The results show VLF events occurring predominantly during the recovering phase of geomagnetic storms produced by high speed solar wind streams (HSSWSs), and by coronal mass ejections (CMEs) which were accompanied by HSSWSs impacts before returning to quiet geomagnetic level. Based on these results, and upon the good association of VLF events with enhancements in the energetic electron flux of the radiation belts, we suggest they might be the ionospheric response to the energetic electrons precipitated from the radiation belts which were predominantly scattered by whistler-mode waves generated by the electrons injected in the magnetosphere during geomagnetic activity produced by HSSWSs. Analisamos a ocorrência de eventos de freqüência rádio muito baixa (VLF) e sua associação com a atividade geomagnética. Os eventos VLF são detectados como variações rápidas de amplitude dos sinais VLF transmitidos da estação do Havaí (NPM -- Marinha dos EUA) e recebidos na Estação Antártica Brasileira Comandante Ferraz no período de setembro a novembro de 2003. Os resultados mostram que os eventos VLF ocorreram predominantemente durante a fase de recuperação das tempestades geomagnéticas produzidas pelo vento solar de alta velocidade (HSSWSs), e por ejeções de massa da coroa solar que foram acompanhadas pelo impacto de HSSWSs antes da atividade geomagnética retornar ao nível calmo. Baseando-se nestes resultados, e devido à boa associação dos eventos VLF com os aumentos no fluxo dos elétrons energéticos dos cinturões de radiação, sugerimos que eles podem ser a resposta ionosférica aos elétrons precipitados dos cinturões de radiação os quais foram predominantemente espalhados por ondas no modo whistler ... Article in Journal/Newspaper Antarc* Antarctic Antártica Unknown Alta Antarctic Boa ENVELOPE(15.532,15.532,66.822,66.822) Ferraz ENVELOPE(-64.117,-64.117,-65.117,-65.117) |
institution |
Open Polar |
collection |
Unknown |
op_collection_id |
ftjob |
language |
Portuguese |
topic |
Ionosphere particle precipitation geomagnetic storms Ionosfera precipitação de partículas tempestades geomagnéticas |
spellingShingle |
Ionosphere particle precipitation geomagnetic storms Ionosfera precipitação de partículas tempestades geomagnéticas Correia, Emília Fernandez, José Henrique Raulin, Jean Pierre On the determination of lower ionospheric perturbations detected as fast amplitude variations of VLF signals |
topic_facet |
Ionosphere particle precipitation geomagnetic storms Ionosfera precipitação de partículas tempestades geomagnéticas |
description |
We analyze the occurrence of very low frequency (VLF) events and their association with geomagnetic activity. VLF events are detected as fast amplitude variations of VLF signals from Hawaii (NPM Navy transmitter) and received at Comandante Ferraz Brazilian Antarctic Station (EACF) in the period from September through November 2003. The results show VLF events occurring predominantly during the recovering phase of geomagnetic storms produced by high speed solar wind streams (HSSWSs), and by coronal mass ejections (CMEs) which were accompanied by HSSWSs impacts before returning to quiet geomagnetic level. Based on these results, and upon the good association of VLF events with enhancements in the energetic electron flux of the radiation belts, we suggest they might be the ionospheric response to the energetic electrons precipitated from the radiation belts which were predominantly scattered by whistler-mode waves generated by the electrons injected in the magnetosphere during geomagnetic activity produced by HSSWSs. Analisamos a ocorrência de eventos de freqüência rádio muito baixa (VLF) e sua associação com a atividade geomagnética. Os eventos VLF são detectados como variações rápidas de amplitude dos sinais VLF transmitidos da estação do Havaí (NPM -- Marinha dos EUA) e recebidos na Estação Antártica Brasileira Comandante Ferraz no período de setembro a novembro de 2003. Os resultados mostram que os eventos VLF ocorreram predominantemente durante a fase de recuperação das tempestades geomagnéticas produzidas pelo vento solar de alta velocidade (HSSWSs), e por ejeções de massa da coroa solar que foram acompanhadas pelo impacto de HSSWSs antes da atividade geomagnética retornar ao nível calmo. Baseando-se nestes resultados, e devido à boa associação dos eventos VLF com os aumentos no fluxo dos elétrons energéticos dos cinturões de radiação, sugerimos que eles podem ser a resposta ionosférica aos elétrons precipitados dos cinturões de radiação os quais foram predominantemente espalhados por ondas no modo whistler ... |
format |
Article in Journal/Newspaper |
author |
Correia, Emília Fernandez, José Henrique Raulin, Jean Pierre |
author_facet |
Correia, Emília Fernandez, José Henrique Raulin, Jean Pierre |
author_sort |
Correia, Emília |
title |
On the determination of lower ionospheric perturbations detected as fast amplitude variations of VLF signals |
title_short |
On the determination of lower ionospheric perturbations detected as fast amplitude variations of VLF signals |
title_full |
On the determination of lower ionospheric perturbations detected as fast amplitude variations of VLF signals |
title_fullStr |
On the determination of lower ionospheric perturbations detected as fast amplitude variations of VLF signals |
title_full_unstemmed |
On the determination of lower ionospheric perturbations detected as fast amplitude variations of VLF signals |
title_sort |
on the determination of lower ionospheric perturbations detected as fast amplitude variations of vlf signals |
publisher |
Associação Brasileira de Ciência Ecológica e Conservação |
publishDate |
2017 |
url |
https://revistas.ufrj.br/index.php/oa/article/view/8056 |
long_lat |
ENVELOPE(15.532,15.532,66.822,66.822) ENVELOPE(-64.117,-64.117,-65.117,-65.117) |
geographic |
Alta Antarctic Boa Ferraz |
geographic_facet |
Alta Antarctic Boa Ferraz |
genre |
Antarc* Antarctic Antártica |
genre_facet |
Antarc* Antarctic Antártica |
op_source |
Oecologia Australis; Vol 11, No 1 (2007): Oecologia Brasiliensis - Ecologia Antártica; 23-28 2177-6199 |
op_relation |
https://revistas.ufrj.br/index.php/oa/article/view/8056/6500 https://revistas.ufrj.br/index.php/oa/article/view/8056 |
op_rights |
Copyright (c) 2017 Oecologia Australis http://creativecommons.org/licenses/by-nc/4.0 |
op_rightsnorm |
CC-BY-NC |
_version_ |
1766268085354889216 |