Characteristics of a long-lived CIR and analytical modelling of the corresponding depression in the GCR flux (CROSBI ID 730815)
Prilog sa skupa u zborniku | sažetak izlaganja sa skupa | međunarodna recenzija
Podaci o odgovornosti
Dumbovic, Mateja ; Vrsnak, Bojan ; Heber, Bernd ; Temmer, Manuela ; Kuhl, Patrick ; Kirin, Anamarija
engleski
Characteristics of a long-lived CIR and analytical modelling of the corresponding depression in the GCR flux
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.
Sun, Heliosphere, corotating interaction regions, forbush decreases, galactic cosmic rays
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Podaci o prilogu
1-1.
2022.
objavljeno
10.5194/egusphere-egu22-11343
Podaci o matičnoj publikaciji
Podaci o skupu
the 24th EGU General Assembly
ostalo
23.05.2022-27.05.2022
Bec, Austrija