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Pregled bibliografske jedinice broj: 1004349

An Analytical Diffusion-Expansion Model for Forbush Decreases Caused by Flux Ropes


(marie curie fellowship) Dumbović, Mateja; Heber, Bernd; Vršnak, Bojan; Temmer, Manuela; Kirin, Anamarija
An Analytical Diffusion-Expansion Model for Forbush Decreases Caused by Flux Ropes // The Astrophysical journal, 860 (2018), 71, 21 doi:10.3847/1538-4357/aac2de (međunarodna recenzija, članak, znanstveni)


Naslov
An Analytical Diffusion-Expansion Model for Forbush Decreases Caused by Flux Ropes

Autori
Dumbović, Mateja ; Heber, Bernd ; Vršnak, Bojan ; Temmer, Manuela ; Kirin, Anamarija

Kolaboracija
Marie curie fellowship

Izvornik
The Astrophysical journal (0004-637X) 860 (2018); 71, 21

Vrsta, podvrsta i kategorija rada
Radovi u časopisima, članak, znanstveni

Ključne riječi
diffusion ; methods: analytical ; solar─terrestrial relations ; Sun: coronal mass ejections: CMEs ; Astrophysics - Solar and Stellar Astrophysics

Sažetak
We present an analytical diffusion-expansion Forbush decrease (FD) model ForbMod, which is based on the widely used approach of an initially empty, closed magnetic structure (i.e., flux rope) that fills up slowly with particles by perpendicular diffusion. The model is restricted to explaining only the depression caused by the magnetic structure of the interplanetary coronal mass ejection (ICME). We use remote CME observations and a 3D reconstruction method (the graduated cylindrical shell method) to constrain initial boundary conditions of the FD model and take into account CME evolutionary properties by incorporating flux rope expansion. Several flux rope expansion modes are considered, which can lead to different FD characteristics. In general, the model is qualitatively in agreement with observations, whereas quantitative agreement depends on the diffusion coefficient and the expansion properties (interplay of the diffusion and expansion). A case study was performed to explain the FD observed on 2014 May 30. The observed FD was fitted quite well by ForbMod for all expansion modes using only the diffusion coefficient as a free parameter, where the diffusion parameter was found to correspond to an expected range of values. Our study shows that, in general, the model is able to explain the global properties of an FD caused by a flux rope and can thus be used to help understand the underlying physics in case studies.

Izvorni jezik
Engleski

Znanstvena područja
Fizika



POVEZANOST RADA


Projekt / tema
HRZZ-IP-2013-11-6212 - Promjenjivost Sunca i zvijezda (Bojan Vršnak, )

Ustanove
Geodetski fakultet, Zagreb

Profili:

Avatar Url Bojan Vršnak (autor)

Avatar Url Anamarija Kirin (autor)

Avatar Url Mateja Dumbović (autor)

Citiraj ovu publikaciju

(marie curie fellowship) Dumbović, Mateja; Heber, Bernd; Vršnak, Bojan; Temmer, Manuela; Kirin, Anamarija
An Analytical Diffusion-Expansion Model for Forbush Decreases Caused by Flux Ropes // The Astrophysical journal, 860 (2018), 71, 21 doi:10.3847/1538-4357/aac2de (međunarodna recenzija, članak, znanstveni)
(marie curie fellowship) (marie curie fellowship) Dumbović, M., Heber, B., Vršnak, B., Temmer, M. & Kirin, A. (2018) An Analytical Diffusion-Expansion Model for Forbush Decreases Caused by Flux Ropes. The Astrophysical journal, 860, 71, 21 doi:10.3847/1538-4357/aac2de.
@article{article, year = {2018}, pages = {21}, DOI = {10.3847/1538-4357/aac2de}, chapter = {71}, keywords = {diffusion, methods: analytical, solar─terrestrial relations, Sun: coronal mass ejections: CMEs, Astrophysics - Solar and Stellar Astrophysics}, journal = {The Astrophysical journal}, doi = {10.3847/1538-4357/aac2de}, volume = {860}, issn = {0004-637X}, title = {An Analytical Diffusion-Expansion Model for Forbush Decreases Caused by Flux Ropes}, keyword = {diffusion, methods: analytical, solar─terrestrial relations, Sun: coronal mass ejections: CMEs, Astrophysics - Solar and Stellar Astrophysics}, chapternumber = {71} }

Časopis indeksira:


  • Current Contents Connect (CCC)
  • Web of Science Core Collection (WoSCC)
    • Science Citation Index Expanded (SCI-EXP)
    • SCI-EXP, SSCI i/ili A&HCI
  • Scopus


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