Emissivity and growth of auroral kilometric radiation in source regions with perpendicular gradients
Autor(a) principal: | |
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Data de Publicação: | 1997 |
Outros Autores: | , |
Tipo de documento: | Artigo |
Idioma: | eng |
Título da fonte: | Repositório Institucional da UFRGS |
Texto Completo: | http://hdl.handle.net/10183/88640 |
Resumo: | Emission and propagation of the auroral kilometric radiation in the auroral zones of the Earth are investigated with the use of the transfer equation for the intensity of the wave along the trajectory, which is obtained with the formulation of the geometríc optics. The cyclotron emissivity and the components of the dielectric tensor are evaluated using the locally homogeneous plasma approximation, taking into account thermal effects and con sidering both the energetic and the background electron populations. For frequencies in the vicinity of the electron cyclotron frequency we consider a range of values of the parallel wave number which result in significant amplification. The effect of the finite width of the amoral cavities is also investigated. Our results show that the inclusion of the effect of wave emissivity along the trajectory is not sufficient to modify significatively the efficiency of the amplification. |
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Cavalcanti, Claudio Jose de HolandaSchneider, Ruth de SouzaZiebell, Luiz Fernando2014-03-20T01:48:22Z19970103-9733http://hdl.handle.net/10183/88640000188517Emission and propagation of the auroral kilometric radiation in the auroral zones of the Earth are investigated with the use of the transfer equation for the intensity of the wave along the trajectory, which is obtained with the formulation of the geometríc optics. The cyclotron emissivity and the components of the dielectric tensor are evaluated using the locally homogeneous plasma approximation, taking into account thermal effects and con sidering both the energetic and the background electron populations. For frequencies in the vicinity of the electron cyclotron frequency we consider a range of values of the parallel wave number which result in significant amplification. The effect of the finite width of the amoral cavities is also investigated. Our results show that the inclusion of the effect of wave emissivity along the trajectory is not sufficient to modify significatively the efficiency of the amplification.application/pdfengBrazilian Journal of Physics. São Paulo. Vol. 27, no. 1 (Mar. 1997), p. 33-43Radiacao quilometrica das auroras : Plasmas : Otica geometrica : Ondas eletromagneticasPropagacao de ondas eletromagneticas em plasmasEmissivity and growth of auroral kilometric radiation in source regions with perpendicular gradientsinfo:eu-repo/semantics/articleinfo:eu-repo/semantics/otherinfo:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/openAccessreponame:Repositório Institucional da UFRGSinstname:Universidade Federal do Rio Grande do Sul (UFRGS)instacron:UFRGSORIGINAL000188517.pdf000188517.pdfTexto completo (inglês)application/pdf651203http://www.lume.ufrgs.br/bitstream/10183/88640/1/000188517.pdf0f83914fbdbe8d268c1a344e33987a2dMD51TEXT000188517.pdf.txt000188517.pdf.txtExtracted Texttext/plain33685http://www.lume.ufrgs.br/bitstream/10183/88640/2/000188517.pdf.txt2cf4e16ec2621f6f608857d807189bb3MD52THUMBNAIL000188517.pdf.jpg000188517.pdf.jpgGenerated Thumbnailimage/jpeg1882http://www.lume.ufrgs.br/bitstream/10183/88640/3/000188517.pdf.jpge997f585a923912f365957cfbc78bb79MD5310183/886402023-07-20 03:35:54.621593oai:www.lume.ufrgs.br:10183/88640Repositório de PublicaçõesPUBhttps://lume.ufrgs.br/oai/requestopendoar:2023-07-20T06:35:54Repositório Institucional da UFRGS - Universidade Federal do Rio Grande do Sul (UFRGS)false |
dc.title.pt_BR.fl_str_mv |
Emissivity and growth of auroral kilometric radiation in source regions with perpendicular gradients |
title |
Emissivity and growth of auroral kilometric radiation in source regions with perpendicular gradients |
spellingShingle |
Emissivity and growth of auroral kilometric radiation in source regions with perpendicular gradients Cavalcanti, Claudio Jose de Holanda Radiacao quilometrica das auroras : Plasmas : Otica geometrica : Ondas eletromagneticas Propagacao de ondas eletromagneticas em plasmas |
title_short |
Emissivity and growth of auroral kilometric radiation in source regions with perpendicular gradients |
title_full |
Emissivity and growth of auroral kilometric radiation in source regions with perpendicular gradients |
title_fullStr |
Emissivity and growth of auroral kilometric radiation in source regions with perpendicular gradients |
title_full_unstemmed |
Emissivity and growth of auroral kilometric radiation in source regions with perpendicular gradients |
title_sort |
Emissivity and growth of auroral kilometric radiation in source regions with perpendicular gradients |
author |
Cavalcanti, Claudio Jose de Holanda |
author_facet |
Cavalcanti, Claudio Jose de Holanda Schneider, Ruth de Souza Ziebell, Luiz Fernando |
author_role |
author |
author2 |
Schneider, Ruth de Souza Ziebell, Luiz Fernando |
author2_role |
author author |
dc.contributor.author.fl_str_mv |
Cavalcanti, Claudio Jose de Holanda Schneider, Ruth de Souza Ziebell, Luiz Fernando |
dc.subject.por.fl_str_mv |
Radiacao quilometrica das auroras : Plasmas : Otica geometrica : Ondas eletromagneticas Propagacao de ondas eletromagneticas em plasmas |
topic |
Radiacao quilometrica das auroras : Plasmas : Otica geometrica : Ondas eletromagneticas Propagacao de ondas eletromagneticas em plasmas |
description |
Emission and propagation of the auroral kilometric radiation in the auroral zones of the Earth are investigated with the use of the transfer equation for the intensity of the wave along the trajectory, which is obtained with the formulation of the geometríc optics. The cyclotron emissivity and the components of the dielectric tensor are evaluated using the locally homogeneous plasma approximation, taking into account thermal effects and con sidering both the energetic and the background electron populations. For frequencies in the vicinity of the electron cyclotron frequency we consider a range of values of the parallel wave number which result in significant amplification. The effect of the finite width of the amoral cavities is also investigated. Our results show that the inclusion of the effect of wave emissivity along the trajectory is not sufficient to modify significatively the efficiency of the amplification. |
publishDate |
1997 |
dc.date.issued.fl_str_mv |
1997 |
dc.date.accessioned.fl_str_mv |
2014-03-20T01:48:22Z |
dc.type.driver.fl_str_mv |
info:eu-repo/semantics/article info:eu-repo/semantics/other |
dc.type.status.fl_str_mv |
info:eu-repo/semantics/publishedVersion |
format |
article |
status_str |
publishedVersion |
dc.identifier.uri.fl_str_mv |
http://hdl.handle.net/10183/88640 |
dc.identifier.issn.pt_BR.fl_str_mv |
0103-9733 |
dc.identifier.nrb.pt_BR.fl_str_mv |
000188517 |
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url |
http://hdl.handle.net/10183/88640 |
dc.language.iso.fl_str_mv |
eng |
language |
eng |
dc.relation.ispartof.pt_BR.fl_str_mv |
Brazilian Journal of Physics. São Paulo. Vol. 27, no. 1 (Mar. 1997), p. 33-43 |
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info:eu-repo/semantics/openAccess |
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openAccess |
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