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Very intense geomagnetic storms: solar sources, characteristics and cycle distribution

Published online by Cambridge University Press:  05 July 2012

Natalia Szajko ,
Germán Cristiani ,
Cristina H. Mandrini  and
Alisson Dal Lago
Natalia Szajko
Affiliation:
Instituto de Astronomía y Física del Espacio, Buenos Aires, Argentina email: [email protected]
Germán Cristiani
Affiliation:
Instituto de Astronomía y Física del Espacio, Buenos Aires, Argentina email: [email protected]
Cristina H. Mandrini
Affiliation:
Instituto de Astronomía y Física del Espacio, Buenos Aires, Argentina email: [email protected]
Alisson Dal Lago
Affiliation:
Instituto Nacional de Pesquisas Espaciais, São José dos Campos, São Paulo, Brazil
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Abstract

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We revisit previous studies in which the characteristics of the solar and interplanetary sources of intense geomagnetic storms have been discussed. We consider the very intense geomagnetic storms that occurred during Solar Cycle 23 by setting a value of Dstmin ≤ −200 nT as threshold. We have identified and characterized the solar and interplanetary sources of each storm. After this, we investigate the overall characteristics of the interplanetary (IP) main-phase storm driver, including the time arrival of the shock/disturbance at 1 AU, the type of associated IP structure/ejecta, the origin of a prolonged and enhanced southward component (Bz) of the IP field, and other characteristics related to the energy injected into the magnetosphere during the storm.

Keywords

Sun: activitySun: coronal mass ejections (CMEs)interplanetary medium
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 7 , Symposium S286: Comparative Magnetic Minima: Characterizing quiet times in the Sun and Stars , October 2011 , pp. 250 - 254
Copyright
Copyright © International Astronomical Union 2012

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