Abstract
AbstractSudden 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.
Highlights
Forbush decreases (FDs) are depletions of fluxes of Galactic Cosmic Rays (GCRs), typically observed at Earth using ground Neutron Monitors (NMs)
Magnetic Clouds (MCs) are a particular subset of Interplanetary Coronal Mass Ejections (ICMEs), and the deepest FDs are associated with the passage of a MC through the terrestrial environment [Richardson & Cane (2011)]
We introduce a method to determine the ejecta components for those FDs showing a two-step profile
Summary
Introduction: Forbush decreases (FDs) are depletions of fluxes of Galactic Cosmic Rays (GCRs), typically observed at Earth using ground Neutron Monitors (NMs). Magnetic Clouds (MCs) are a particular subset of Interplanetary Coronal Mass Ejections (ICMEs), and the deepest FDs are associated with the passage of a MC through the terrestrial environment [Richardson & Cane (2011)]. The decomposition of the effects of shock and ejecta components is very important, in particular for comparisons of FD observations with model predictions.
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