Naslov
Galactic Cosmic Ray Variation Caused by Interacting Earth-Impacting Coronal Mass Ejection

Autori
Šterc, Filip ; Maričić, Darije ; Roša, Dragan ; Romštajn Ivan ; Hržina, Damir

Vrsta, podvrsta i kategorija rada
Sažeci sa skupova, neobjavljeni rad, znanstveni

Skup
Na 18th European Space Weather Week (ESWW) 2022

Mjesto i datum
Zagreb, Hrvatska, 24-28. 10. 2022

Vrsta sudjelovanja
Poster

Vrsta recenzije
Međunarodna recenzija

Ključne riječi
coronal mass ejections, cosmic rays, forbush decrease

Sažetak
We investigate the distribution of galactic cosmic ray (GCR) caused by interacting Earth-impacting interplanetary coronal mass ejections (ICMEs). Observations from different satellites are used to determine whether each CME under study is Earth directed or not. For Earth-directed CMEs, a kinematical study was performed to estimate the CME arrival time at 1 AU and to link the CMEs with the corresponding in situ solar wind counterparts. Based on the extrapolated CME kinematics, we identified isolated CMEs, which are excluded from further analysis. Applying this approach, a set of 26 interacting Earth-impacting CMEs was unambiguously identified and related to the in situ measurements recorded by the Wind spacecraft. Interacting Earth-impacting CMEs were analysed in more detail considering the magnetic field strength, the plasma characteristics and variation of the GCR flux within an whole complex internal structure of the disturbance. Furthermore, the analysis revealed well-defined correlations between magnitude of CR flux variation, AF, and the magnetic field strength, B, bulk solar wind speed, v and proton thermal speed vth. All three correlations have high correlation coefficients cc = 0.72, 0.71 and 0.74, respectively. On the other hand, the individual correletion for Bmax/vmax, Bmax/vthmax, and vmax/vthmax, are very strong (cc = 0.67, 0.79 and 0.86, respectively).

Izvorni jezik
Engleski

Znanstvena područja
Fizika, Geofizika

POVEZANOST RADA