Could a full-halo CME coming from the limb be geoeffective?

CID, C.; SCHMIEDER, B.; ARAN, A.; CERRATO, Y.; CHANDRA, R.; CREMADES, H.; DASSO, S.; JACOBS, C.; LATHIULLERE, C.; MANDRINI, C.H.; MENVIELLE, M.; POEDTS, S.; RODRIGUEZ, L.; SAIZ, E.; ZHUKOV, A.

Berlín

Simposio; SCOSTEP Symposium 2010 - STP12; 2010

Scientific Committee on Solar-Terrestrial Physics

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.