Pregled bibliografske jedinice broj: 1009764
The Analytical Diffusion-Expansion Model for Forbush Decreases Caused by Flux Ropes
The Analytical Diffusion-Expansion Model for Forbush Decreases Caused by Flux Ropes // AGU Fall Meeting
New Orleans (LA), Sjedinjene Američke Države, 2017. str. 1-1 (poster, međunarodna recenzija, sažetak, znanstveni)
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Naslov
The Analytical Diffusion-Expansion Model for Forbush Decreases Caused by Flux Ropes
Autori
Mateja Dumbović ; Manuela Temmer
Vrsta, podvrsta i kategorija rada
Sažeci sa skupova, sažetak, znanstveni
Skup
AGU Fall Meeting
Mjesto i datum
New Orleans (LA), Sjedinjene Američke Države, 11.12.2017. - 15.12.2017
Vrsta sudjelovanja
Poster
Vrsta recenzije
Međunarodna recenzija
Ključne riječi
CMEs, flux ropes, Forbush decrease
Sažetak
Identification and tracking of interplanetary coronal mass ejections (ICMEs) throughout the heliosphere is a growingly important aspect of space weather research. One of the ”signatures” of ICME passage is the corresponding Forbush decrease (FD), a short term decrease in the galactic cosmic ray flux. These depressions are observed at the surface of the Earth for over 50 years, by several spacecraft in interplanetary space in the past couple of decades, and recently also on Mars’ surface with Curiosity rover. In order to use FDs as ICME signatures efficiently, it is important to model ICME interaction with energetic particles by taking into account ICME evolution and constraining the model with observational data. We present an analytical diffusion-expansion FD model ForbMod which is based on the widely used approach of the initially empty, closed magnetic structure (i.e. flux rope) which fills up slowly with particles by perpendicular diffusion. The model is restricted to explain only the depression caused by the magnetic structure of the ICME and not of the associated shock. We use remote CME observations and a 3D reconstruction method (the Graduated Cylindrical Shell method) to constrain initial and boundary conditions of the FD model and take into account CME evolutionary properties by incorporating flux rope expansion. Several options of flux rope expansion are regarded as the competing mechanism to diffusion which can lead to different FD characteristics. This project has received funding from the European Union’s Horizon 2020 research and innovation programme under the Marie Skłodowska-Curie grant agreement No 745782.
Izvorni jezik
Engleski
Znanstvena područja
Fizika
