Speaker
Dr
Mateja Dumbovic
(Hvar Observatory, Faculty of Geodesy, University of Zagreb)
Description
Forbush decreases are short-term depressions in the galactic cosmic ray (GCR) flux caused by interplanetary coronal mass ejections (ICMEs) and corotating interaction regions (CIRs). Changes in GCR flux is of interest for many open questions regarding Earth weather/climate issues, as well as space travel, adding to the importance of understanding and modeling of Forbush decreases. In our study we focus on the depressions caused by ICMEs which do not drive shocks/sheaths and have smoothly rotating strong magnetic field (magnetic clouds). We consider initially empty magnetic cloud which fills up slowly with particles by perpendicular (radial) diffusion. We will discuss the feasibility of the diffusion-based analytical model with respect to observations, especially regarding the ICME expansion. We acknowledge the support of European Social Fond under the project ”PoKRet”, the support of Croatian Science Foundation under the project 6212 „Solar and Stellar Variability“and of MZOS/DAAD under the bilateral project “CORAMOD”.
Primary author
Dr
Mateja Dumbovic
(Hvar Observatory, Faculty of Geodesy, University of Zagreb)
Co-authors
Prof.
Astrid Veronig
(IGAM, Institute of Physics, University of Graz)
Prof.
Bernd Heber
(Institute for Extraterrestrial Physics, University of Kiel)
Dr
Bojan Vrsnak
(Hvar Observatory, Faculty of Geodesy, University of Zagreb)
Dr
Christian Moestl
(Space Research Institute, Graz)
Mr
Dennis Galsdorf
(Institute for Extraterrestrial Physics, University of Kiel)
Dr
Jasa Calogovic
(Hvar Observatory, Faculty of Geodesy, University of Zagreb)
Dr
Konstantin Herbst
(Institute for Extraterrestrial Physics, University of Kiel)
Prof.
Manuela Temmer
(IGAM, Institute of Physics, University of Graz)
Mr
Patrick Kuehl
(Institute for Extraterrestrial Physics, University of Kiel)
