Solar Tides in the winds of the southern polar region of Venus using VIRTIS-M/Venus Express images
Autor(a) principal: | |
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Data de Publicação: | 2011 |
Outros Autores: | , , , , , |
Tipo de documento: | Artigo de conferência |
Idioma: | eng |
Título da fonte: | Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) |
Texto Completo: | http://hdl.handle.net/10174/4061 |
Resumo: | The effect of the solar tides on the winds at the top of the clouds in Venus has been studied using cloud tracking technique applied to the Venus Express/VIRTIS-M images taken at wavelengths of 3.8 and 5.0 μm. Both these wavelengths probe about the same altitude on the clouds top, allowing for the first time to retrieve winds in the dayside and nightside simultaneously. The dataset included observations from 17 orbits, covering a time span of 290 days and a latitude range between 70ºS and 85ºS, a region where resides the so called cold collar. Both the diurnal (wavenumber 1) and the semidiurnal (wavenumber 2) tides are present, with the diurnal tide being the dominant harmonic for both the zonal and meridional components of the wind. The diurnal tide induces wind oscillations with amplitudes of about 4.5 m/s and 8.0 m/s for the zonal and meridional winds respectively. These amplitudes are in good accordance with the Rayleigh friction expected for this level of the Venus atmosphere, and support the important role of the diurnal tide in the maintenance of the mean zonal flow and in determining the sense of the meridional flow. While the tidal amplitude seems not to undergo important changes, the phase displays a temporal variability of about 1.4 hours in the local time coordinate. The rate of change of the phase seems different for the diurnal and semidiurnal component, indicative of a dispersive character of the solar tides, and is consistent with the expected change due to the tidal vertical propagation. Finally, a persistent lag is apparent in most cases between the tidal phases of zonal and meridional disturbances, implying that the diurnal tides tend to force equatorward winds when in the sense of the mean flow, and poleward winds when in the opposite sense. |
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Solar Tides in the winds of the southern polar region of Venus using VIRTIS-M/Venus Express imagesVenusCirculationThe effect of the solar tides on the winds at the top of the clouds in Venus has been studied using cloud tracking technique applied to the Venus Express/VIRTIS-M images taken at wavelengths of 3.8 and 5.0 μm. Both these wavelengths probe about the same altitude on the clouds top, allowing for the first time to retrieve winds in the dayside and nightside simultaneously. The dataset included observations from 17 orbits, covering a time span of 290 days and a latitude range between 70ºS and 85ºS, a region where resides the so called cold collar. Both the diurnal (wavenumber 1) and the semidiurnal (wavenumber 2) tides are present, with the diurnal tide being the dominant harmonic for both the zonal and meridional components of the wind. The diurnal tide induces wind oscillations with amplitudes of about 4.5 m/s and 8.0 m/s for the zonal and meridional winds respectively. These amplitudes are in good accordance with the Rayleigh friction expected for this level of the Venus atmosphere, and support the important role of the diurnal tide in the maintenance of the mean zonal flow and in determining the sense of the meridional flow. While the tidal amplitude seems not to undergo important changes, the phase displays a temporal variability of about 1.4 hours in the local time coordinate. The rate of change of the phase seems different for the diurnal and semidiurnal component, indicative of a dispersive character of the solar tides, and is consistent with the expected change due to the tidal vertical propagation. Finally, a persistent lag is apparent in most cases between the tidal phases of zonal and meridional disturbances, implying that the diurnal tides tend to force equatorward winds when in the sense of the mean flow, and poleward winds when in the opposite sense.2012-01-24T11:42:20Z2012-01-242011-10-01T00:00:00Zinfo:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/conferenceObjecthttp://hdl.handle.net/10174/4061http://hdl.handle.net/10174/4061engEPSC Abstracts Vol. 6, EPSC-DPS2011-1269, 2011 EPSC-DPS Joint Meeting 2011Nantes, FrançaEPSC-DPS Joint Meeting 2011naonaosimperalta@oal.ul.ptdluz@oal.ul.ptdberry@uevora.ptgiuseppe.piccioni@iasf-roma.inaf.itpierre.drossart@obspm.frricardo.hueso@ehu.esagustin.sanchez@ehu.es243Peralta, JavierLuz, DavidBerry, DavidPiccioni, GiuseppeDrossart, PierreHueso, RicardoSánchez-Lavega, Agustininfo:eu-repo/semantics/openAccessreponame:Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos)instname:Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informaçãoinstacron:RCAAP2024-01-03T18:41:51Zoai:dspace.uevora.pt:10174/4061Portal AgregadorONGhttps://www.rcaap.pt/oai/openaireopendoar:71602024-03-20T00:59:27.319798Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) - Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informaçãofalse |
dc.title.none.fl_str_mv |
Solar Tides in the winds of the southern polar region of Venus using VIRTIS-M/Venus Express images |
title |
Solar Tides in the winds of the southern polar region of Venus using VIRTIS-M/Venus Express images |
spellingShingle |
Solar Tides in the winds of the southern polar region of Venus using VIRTIS-M/Venus Express images Peralta, Javier Venus Circulation |
title_short |
Solar Tides in the winds of the southern polar region of Venus using VIRTIS-M/Venus Express images |
title_full |
Solar Tides in the winds of the southern polar region of Venus using VIRTIS-M/Venus Express images |
title_fullStr |
Solar Tides in the winds of the southern polar region of Venus using VIRTIS-M/Venus Express images |
title_full_unstemmed |
Solar Tides in the winds of the southern polar region of Venus using VIRTIS-M/Venus Express images |
title_sort |
Solar Tides in the winds of the southern polar region of Venus using VIRTIS-M/Venus Express images |
author |
Peralta, Javier |
author_facet |
Peralta, Javier Luz, David Berry, David Piccioni, Giuseppe Drossart, Pierre Hueso, Ricardo Sánchez-Lavega, Agustin |
author_role |
author |
author2 |
Luz, David Berry, David Piccioni, Giuseppe Drossart, Pierre Hueso, Ricardo Sánchez-Lavega, Agustin |
author2_role |
author author author author author author |
dc.contributor.author.fl_str_mv |
Peralta, Javier Luz, David Berry, David Piccioni, Giuseppe Drossart, Pierre Hueso, Ricardo Sánchez-Lavega, Agustin |
dc.subject.por.fl_str_mv |
Venus Circulation |
topic |
Venus Circulation |
description |
The effect of the solar tides on the winds at the top of the clouds in Venus has been studied using cloud tracking technique applied to the Venus Express/VIRTIS-M images taken at wavelengths of 3.8 and 5.0 μm. Both these wavelengths probe about the same altitude on the clouds top, allowing for the first time to retrieve winds in the dayside and nightside simultaneously. The dataset included observations from 17 orbits, covering a time span of 290 days and a latitude range between 70ºS and 85ºS, a region where resides the so called cold collar. Both the diurnal (wavenumber 1) and the semidiurnal (wavenumber 2) tides are present, with the diurnal tide being the dominant harmonic for both the zonal and meridional components of the wind. The diurnal tide induces wind oscillations with amplitudes of about 4.5 m/s and 8.0 m/s for the zonal and meridional winds respectively. These amplitudes are in good accordance with the Rayleigh friction expected for this level of the Venus atmosphere, and support the important role of the diurnal tide in the maintenance of the mean zonal flow and in determining the sense of the meridional flow. While the tidal amplitude seems not to undergo important changes, the phase displays a temporal variability of about 1.4 hours in the local time coordinate. The rate of change of the phase seems different for the diurnal and semidiurnal component, indicative of a dispersive character of the solar tides, and is consistent with the expected change due to the tidal vertical propagation. Finally, a persistent lag is apparent in most cases between the tidal phases of zonal and meridional disturbances, implying that the diurnal tides tend to force equatorward winds when in the sense of the mean flow, and poleward winds when in the opposite sense. |
publishDate |
2011 |
dc.date.none.fl_str_mv |
2011-10-01T00:00:00Z 2012-01-24T11:42:20Z 2012-01-24 |
dc.type.status.fl_str_mv |
info:eu-repo/semantics/publishedVersion |
dc.type.driver.fl_str_mv |
info:eu-repo/semantics/conferenceObject |
format |
conferenceObject |
status_str |
publishedVersion |
dc.identifier.uri.fl_str_mv |
http://hdl.handle.net/10174/4061 http://hdl.handle.net/10174/4061 |
url |
http://hdl.handle.net/10174/4061 |
dc.language.iso.fl_str_mv |
eng |
language |
eng |
dc.relation.none.fl_str_mv |
EPSC Abstracts Vol. 6, EPSC-DPS2011-1269, 2011 EPSC-DPS Joint Meeting 2011 Nantes, França EPSC-DPS Joint Meeting 2011 nao nao sim peralta@oal.ul.pt dluz@oal.ul.pt dberry@uevora.pt giuseppe.piccioni@iasf-roma.inaf.it pierre.drossart@obspm.fr ricardo.hueso@ehu.es agustin.sanchez@ehu.es 243 |
dc.rights.driver.fl_str_mv |
info:eu-repo/semantics/openAccess |
eu_rights_str_mv |
openAccess |
dc.source.none.fl_str_mv |
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Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informação |
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RCAAP |
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RCAAP |
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Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) |
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Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) |
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Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) - Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informação |
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