Naslov
Characteristics of a long-lived CIR and analytical modelling of the corresponding depression in the GCR flux

Autori
Dumbovic, Mateja ; Vrsnak, Bojan ; Heber, Bernd ; Temmer, Manuela ; Kuhl, Patrick ; Kirin, Anamarija

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

Skup
The 24th EGU General Assembly

Mjesto i datum
Bec, Austrija, 23.05.2022. - 27.05.2022

Vrsta sudjelovanja
Ostalo

Vrsta recenzije
Međunarodna recenzija

Ključne riječi
Sun, Heliosphere, corotating interaction regions, forbush decreases, galactic cosmic rays

Sažetak
We observe a long-lived CIR recurring in 27 consecutive Carrington rotations 2057-2083 in the time period from June 2007 - May 2009. We characterize the in situ measurements of this long-lived CIR as well as the corresponding depression in the GCR count observed by SOHO/EPHIN, and analyze them throughout different rotations. We find that the inverted GCR count time-profile correlates well with that of the flow speed throughout different rotations. We perform a statistical analysis and find the GCR count amplitude correlated to the peak in the magnetic field and flow speed, as expected based on previous statistical studies. In order to characterize a generic CIR profile for modelling purposes, we perform the superposed epoch analysis using relative values of the key parameters. Based on the observed properties we propose a simple analytical model starting from the basic Fokker-Planck equation. We employ a convection- diffusion GCR propagation model and apply it to the solar wind and interplanetary magnetic field properties observed for the analyzed long-lived CIR. Our analysis demonstrates a very good match of the model results and observations.

Izvorni jezik
Engleski

Znanstvena područja
Fizika

POVEZANOST RADA