Influence of coronal mass ejection orientation on dynamics in interplanetary space

doctoral thesis

• Title (croatian): Utjecaj orijentacije koronina izbačaja na dinamiku u međuplanetarnom prostoru
• Author: Karmen Martinić
• Mentor: Bojan Vršnak (mentor)
• Committee member: Manuela Temmer https://orcid.org/0000-0003-4867-7558 (predsjednik povjerenstva)
• Committee member: Bojan Vršnak (član povjerenstva)
• Committee member: Snježana Markušić (član povjerenstva)
• Committee member: Iva Dasović (član povjerenstva)
• Committee member: Roman Brajša (član povjerenstva)
• Granter: University of Zagreb; Faculty of Science; (Department of Geophysics); Zagreb
• Defense date and country: 2024-12-17, Croatia
• Scientific / art field, discipline and subdiscipline: NATURAL SCIENCES; Geophysics; Other Geographic Disciplines
• Universal decimal classification (UDC): 520/524 - Astronomy. Astrophysics. Space research

Abstract

When coronal mass ejections (CMEs) propagate through interplanetary space, they interact with the surrounding magnetic field and solar wind, which are neither homogeneous nor isotropic. Consequently, CMEs with different orientations may face varying environmental conditions, leading to different interactions based on their orientation. Our observational studies include remote and in-situ analysis of CMEs. We derived their orientation near Sun using 3D and 2D CME geometry reconstruction methods... More based on remote observations, as well as their orientation near Earth using a rotational profile of the magnetic field detected in-situ. A complementary simulation study was performed using the EUropean Heliospheric FORecasting Information Asset, a 3D magnetohydrodynamic (MHD) model with two spheromak CMEs, differing only in inclination. In general, we found that plasma flows in front of the CME differ based on orientation, though no significant difference in MHD drag between different orientations was found. These findings enhance our understanding of CME-ambient interactions, which is crucial for advancing space weather predictions. Less

Abstract (croatian)

Koronini izbačaji (engl., coronal mass ejections, CMEs) u međuplanetarnom prostoru međudjeluju s okolnim magnetskim poljem i Sunčevim vjetrom, koji ne pokazuju homogenost niti izotropnost. Posljedično, CME-ovi različitih orijentacija nailaze na drugačije uvijete u međuplanetarnom prostoru, stoga njihovo međudjelovanje može ovisiti o orijentaciji CME-ova. Proučavali smo CME-ove različitih orijentacija pomoću daljinskih i in-situ podataka. Orijentacija CME-ova blizu Sunca određena je koristeći... More metode 3D i 2D rekonstrukcije geometrije iz daljinskih mjerenja. Orijentacija CME-a u blizini Zemlje određena je koristeći rotacijski profil magnetskog polja mjerenog insitu. Komplementarna analiza je provedena pomoću EUropean Heliospheric FORecasting Information Asset, 3D magnetohidrodinamiˇckog (MHD) modela, sa sferomak reprezentacijom dva CME-a koji se razlikuju jedino po orijentaciji. Pokazali smo da tok plazme, neposredno ispred CME-ova, ovisi o orijentaciji istih, međutim značajna razlika u MHD otporu nije pronađena. Ovaj rad doprinosi boljem razumijevanje interakcije između CME-ova i ambijentalog magnetskog polja te Sunčevog vjetra, što je ključno za poboljšanje predikcija u okviru svemirskog vremena (engl. space weather). Less

• Keywords: coronal mass ejections; heliosphere; inclination effect; magnetohydrodynamic drag; non-radial flows
• Keywords (croatian): koronin izbačaj; heliosfera; inklinacija; magnetohidrodinamički otpor; ne-radijalni tokovi plazme
• Language: english
• URN:NBN: urn:nbn:hr:217:449126
• Promotion: 2025
• Study programme: Title: Doctoral study in physics; Study programme type: university; Study level: postgraduate; Academic / professional title: doktor/doktorica znanosti, područje prirodnih znanosti, polje fizika (doktor/doktorica znanosti, područje prirodnih znanosti, polje fizika)
• Type of resource: Text
• Extent: 79 str. ; 30 cm
• File origin: Born digital
• Access conditions: Open access
• Public note: Ovaj rad nastao je u okviru projekta "Projekt razvoja karijera mladih istraživača" (DOK-2020-01-8759)
• Created on: 2025-01-27 16:36:37