Galactic cosmic ray decreases associated to non-interacting magnetic clouds during the 23rd solar cycle
1 : Departamento de Fisica de la Facultad de Ciencias Exactas y Naturales Universidad de Buenos Aires
(Depto. Fisica FCEyN UBA)
-
Website
Departamento de Física Facultad de Ciencias Exactas y Naturales Pabellón I Ciudad Universitaria 1428 Buenos Aires -
Argentina
2 : Instituto de Astronomia y Fisica del Espacio
(IAFE (UBA-CONICET))
-
Website
* : Corresponding author
Casilla de Correo 67 - Suc. 28 (C1428ZAA) Ciudad Autónoma de Buenos Aires -
Argentina
It is known that the presence of magnetic clouds (MCs) in the vicinity of Earth causes the deepest decreases in galactic cosmic ray (GCRs) flux at ground level (i.e., Forbush decreases). We present here a selection of Forbush decreases, which are associated to non-interacting MCs, and perform a statistical study on the shock/ejecta components for a subset of this events. By looking for correlation between the most relevant parameters of MCs and GCRs, we propose causality mechanisms to explain the observed correlations. In particular, we determine the relevance of each of the physical processes involved in the GCRs modulation, such as: diffusion, magnetic cloud expansion and trapping times of confinement.
| Subject : | : | poster |
| Topics | : | Poster Session II: CME - ICME - Space Weather |
| Keywords | : | magnetic clouds ; galactic cosmic rays ; forbush decreases ; diffusion |
| PDF version | : |  PDF version |
