Interplanetary fast forward shocks and their geomagnetic effects: CAWSES events

Autor(es)

Echer, E. ; Tsurutani, B. T. ; Guarnieri, F. L. ; Kozyra, J. U.

• Tipo de documento: Artigo Científico
• Fonte: JOURNAL OF ATMOSPHERIC AND SOLAR-TERRESTRIAL PHYSICS; v. 73, n. 11-12, p. 9-pg., 2011-07-01.

Resumo

The seven CAWSES interplanetary fast forward shocks and their geomagnetic effects during 2004-2005 have been analyzed. It is found that the arrival time of the shocks at Earth can be estimated within an accuracy of similar to 5 min. Furthermore, AL decreases are found to occur within 10 min of shock impingement on the magnetopause. It was also determined that there is a direct correlation between the interplanetary magnetic field southward directed (IMF B-s) prior to shock arrival and substorms triggered by the shocks. If the IMF is northward prior to shock arrival, the geomagnetic activity is present but is low. One interpretation of this result is that the preconditioning energy stored in the magnetotail leaks away rapidly. A correlation between substorm peak AL and shock strength (Mach number) has also been noted, which could imply that shock strength is important for the amount of energy released into the magnetosphere/ionosphere. (C) 2010 Elsevier Ltd. All rights reserved. (AU)

• Processo FAPESP: 08/05607-2 - Bruce Tadashi Tsurutani | Jet Propulsion Laboratory/NASA - Estados Unidos
• Beneficiário: Fernando Luis Guarnieri
• Modalidade de apoio: Auxílio à Pesquisa - Pesquisador Visitante - Internacional