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STP12 Abstracts Berlin, 12 - 16 July 2010 SCOSTEP Symposium 2010 Could a full-halo CME coming from the limb be geoeffective? Cid Consuelo 1 , Schmieder Brigitte 2 , Aran Angel 3 , Cerrato Yolanda 1 , Chandra Ramesh 4 , Cremades Hebe 5 , Dasso Sergio 6 , Jacobs Carla 7 , Lathuillere Chantal 8 , Mandrini Cristina 6 , Menvielle Michel 9 , Poedts Stefaan 7 , Rodriguez Luciano 10 , Saiz Elena 1 , Zhukov Andrei 2 1 2 3 4 5 6 7 8 9 Madrid, Observatoire de Paris, ESA, ARIES, NASA, IAFE, Leuven, Grenoble, Saint Maur, 10 Observatoire de Belgique Fast halo CMEs coming from the solar central meridian are considered as the most geoeffective solar events. However, large disturbances at terrestrial environment have been also associated to halo CMEs from regions located far from central solar meridian, as Halloween storm. In this work we have selected all full halo CMEs from solar cycle 23, as observed by the LASCO coronagraph on board SOHO mission, with source at solar limb looking for the possibility of connection between solar limb and terrestrial environment. For this task, when the result of the limb halo CME might be a geomagnetic storm, we have analyzed every link in the Sun-Earth chain. In order to associate different links one to each other (as CME –ICME) we have not considered only the time window, but also we have carefully revised every candidate at solar surface.
STP12 Abstracts Berlin, 12 - 16 July 2010 SCOSTEP Symposium 2010 Meridional winds in the equatorial ionization anomaly observed by the Streak mission Clemmons James , Walterscheid Richard , Christensen Andrew , Bishop Rebecca The Aerospace Corporation New analyses of thermospheric measurements from the ionization gauge on the Streak mission are presented and discussed. These measurements, returned from the dusk bottomside ionospheric F-layer, show strong signatures in the neutral gas impressed through the action of the equatorial ionization anomaly (EIA). These signatures are interpreted as being due to very rapid (several hundred meters per second) meridional winds associated with the equatorial ion fountain at dusk. The winds are shown to be consistent with a picture of the EIA at dusk developed from DE-2 measurements and discussed as the Equatorial Temperature and Wind Anomaly. The present measurements show how these winds depend on altitude. Furthermore, the wind structure exhibits a set of convection rolls that extends to high latitudes and is thus a form of coupling from low latitude to high latitude.
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scostep 2010 (stp12) - Leibniz-Institut für Atmosphärenphysik an der ...

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