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Galactic cosmic ray decreases associated with non-interacting magnetic clouds in the 23rd solar cycle

Published online by Cambridge University Press:  06 January 2014

J. J. Masías-Meza  and
S. Dasso
J. J. Masías-Meza
Affiliation:
Departamento de Física (FCEN-UBA-IFIBA), BsAs, Argentina email: masiasmj@df.uba.ar
S. Dasso
Affiliation:
Departamento de Física (FCEN-UBA), BsAs, Argentina Instituto de Astronomía y Física del Espacio (UBA-CONICET), BsAs, Argentina email: dasso@df.uba.ar
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Abstract

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Sudden Galactic Cosmic Ray (GCR) intensity decreases are related to the passage of Interplanetary Coronal Mass Ejections (ICMEs). These phenomena are also known as Forbush Decreases (FDs). The deepest FDs are associated with the passage of Magnetic Clouds (MCs). In this preliminary study we select “non-interacting” MCs associated with FDs observed from ground Neutron Monitors in the period 1996-2009, with the aim of reducing the complexity and the number of parameters involved in the GCR-MC interactions. We introduce a method to determine properties of the “ejecta component” of the FD. We analyze properties of the ejecta component in combination with properties of MCs. From the resulting selection of events, we find that those FDs containing ejecta components show stronger correlations with MC parameters than our total sample of events.

Keywords

Sun: magnetic fieldsSun: coronal mass ejections (CMEs)cosmic rays
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 8 , Symposium S300: Nature of Prominences and their role in Space Weather , June 2013 , pp. 483 - 484
Copyright
Copyright © International Astronomical Union 2013 

References

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