Naslov
Galactic cosmic rays as signatures of coronal mass ejections

Autori
Luka Kramaric, Mateja Dumbovic, Bojan Vrsnak, Bernd Heber, Ilona Benko, Malte Horlock, Karmen Martinic

Vrsta, podvrsta i kategorija rada
Sažeci sa skupova, sažetak, znanstveni

Skup
European Space Weather Week 2022

Mjesto i datum
Zagreb, Hrvatska, 24.10.2022. - 29.10.2022

Vrsta sudjelovanja
Poster

Vrsta recenzije
Međunarodna recenzija

Ključne riječi
Sun, Heliosphere, coronal mass ejection, forbush decreases, galactic cosmic rays

Sažetak
Coronal mass ejections (CMEs) are eruptions of plasma and magnetic field from Sun's Corona. CMEs are observed with coronagraphs moments after erupting. CME's counterpart Interplanetary coronal mass ejection (ICME) shows several signatures in magnetic field and plasma data and is often followed by a sudden decrease in galactic cosmic ray (GCR) count (i.e. Forbush decrease). We looked for ICMEs followed by a distinct Forbush decrease and matched them with their CME counterparts. To confirm the ICME-CME association we used Drag-based model (DBM) that gives us the timeframe in which CME observed near Sun struck the Earth. By using ForbMod we made the best-fit function for ICME related Forbush decreases. After that we applied the best-fit function on our dataset and compared it to observed measurements from SOHO/EPHIN. As a result we got a corelation coefficient of 0.8 which is encouraging considering that our dataset consists of Forbush decreases of varying qualities including ones with unclear boundaries. Unclear boundaries present a problem because they have to be precisely determined in order to achieve the best results.

Izvorni jezik
Engleski

Znanstvena područja
Fizika

POVEZANOST RADA