%0 Journal Article 
%A Cerrato Montalbán, Yolanda
%A Saiz Villanueva, María Elena
%A Cid Tortuero, Consuelo
%A González, W.D.
%A Palacios Hernández, Judith
%T Solar and interplanetary triggers of the largest Dst variations of solar cycle 23
%D 2012
%@ 1364-6826
%U http://hdl.handle.net/10017/29274
%X We present the results of an investigation from the Sun to the Earth of the sequence of events that caused major Dst decreases (DeltaDst ≤ -100 nT during one hour) that occurred during 1996&-2005. These events are expected to be better related to GIC  (geomagnetic induced currents) events, than those events where any geomagnetic index  is far from its quiet time value. At least one full halo CME with a speed on the plane of  sky above 900 km/s participates in every studied event. The seven events were triggered  by interplanetary signatures which arise as a consequence of interaction among different  solar ejections. The interaction arises at different stages from the solar surface, between  segments of a filament, to the interplanetary medium, appearing as ejecta or MultiMCs  (multiple-magnetic cloud). In other cases, shock waves overtake or compress previous  ICMEs and at other times the interaction appears also between MCs (magnetic clouds)  and streams.
%K Solar physics
%K Astrophysics
%K Astronomy
%K Magnetic fields
%K Geomagnetic storms
%K Fisica
%K Physics
%K Astronomía
%K Astronomy
%~ Biblioteca Universidad de Alcala