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• W4230732775 abstract "PreviousNext No Access9th International Congress of the Brazilian Geophysical Society & EXPOGEF, Salvador, Bahia, Brazil, 11-14 September 2005The solar origin of the October 21st-22nd (1999) very intense geomagnetic stormAuthors: A. Dal LagoL. E. A. VieiraE. EcherF. L. GuarnieriM. R. da SilvaA. de LucasW. D. GonzalezA. L. Clua de GonzalezA. Dal LagoInstituto Nacional de Pesquisas Espaciais, INPE, São José dos Campos, SP, BrazilSearch for more papers by this author, L. E. A. VieiraInstituto Nacional de Pesquisas Espaciais, INPE, São José dos Campos, SP, BrazilSearch for more papers by this author, E. EcherInstituto Nacional de Pesquisas Espaciais, INPE, São José dos Campos, SP, BrazilSearch for more papers by this author, F. L. GuarnieriInstituto Nacional de Pesquisas Espaciais, INPE, São José dos Campos, SP, BrazilSearch for more papers by this author, M. R. da SilvaInstituto Nacional de Pesquisas Espaciais, INPE, São José dos Campos, SP, BrazilSearch for more papers by this author, A. de LucasInstituto Nacional de Pesquisas Espaciais, INPE, São José dos Campos, SP, BrazilSearch for more papers by this author, W. D. GonzalezInstituto Nacional de Pesquisas Espaciais, INPE, São José dos Campos, SP, BrazilSearch for more papers by this author, and A. L. Clua de GonzalezInstituto Nacional de Pesquisas Espaciais, INPE, São José dos Campos, SP, BrazilSearch for more papers by this authorhttps://doi.org/10.1190/sbgf2005-406 SectionsAboutPDF/ePub ToolsAdd to favoritesDownload CitationsTrack CitationsPermissions ShareFacebookTwitterLinked InRedditEmail Abstract In this work we address the solar origin of the October 21st -22nd (1999) very intense geomagnetic storm, which was caused by the interaction between an interplanetary ejecta (ICME) and a high speed stream. We believe that a high speed stream compressed the interplanetary ejecta and intensified its internal magnetic field, thus increasing the intensity of the geomagnetic storms. This kind of event is very difficult to predict based on remote observations of the solar corona, such as those from the Large Angle and Spectroscopic Coronagraph – LASCO, abord the Solar and Heliospheric Observatory – SOHO, because they are normaly related to relatively slow CMEs. Using combined data from different instruments, we present evidences on the solar disk of a coronal hole just beside (to the east) the active region from which the coronal mass ejection was liftted off. In the last solar cycle at least 1 out of 14 very intense geomangetic storms, i.e. peak Dst < -200 nT, was caused by such a mechanism. Keywords: geomagnetic, storm, interplanetary, coronal, mass, ejectionPermalink: https://doi.org/10.1190/sbgf2005-406FiguresReferencesRelatedDetails 9th International Congress of the Brazilian Geophysical Society & EXPOGEF, Salvador, Bahia, Brazil, 11-14 September 2005ISSN (online):2159-6832Copyright: 2005 Pages: 2274 publication data© 2005 Published in electronic format with permission by the Brazilian Geophysical SocietyPublisher:Society of Exploration Geophysicists HistoryPublished: 14 Sep 2005 CITATION INFORMATION A. Dal Lago, L. E. A. Vieira, E. Echer, F. L. Guarnieri, M. R. da Silva, A. de Lucas, W. D. Gonzalez, and A. L. Clua de Gonzalez, (2005), The solar origin of the October 21st-22nd (1999) very intense geomagnetic storm, SEG Global Meeting Abstracts : 2012-2015. https://doi.org/10.1190/sbgf2005-406 Plain-Language Summary KeywordsgeomagneticstorminterplanetarycoronalmassejectionPDF DownloadLoading ..." @default.
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• W4230732775 title "The solar origin of the October 21st-22nd (1999) very intense geomagnetic storm" @default.
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