Geomagnetska aktivnost kao posljedica Sunčevih koroninih šupljina u razdoblju od 2010. do 2017.

master's thesis

• Title (english): Geomagnetic activity as a consequence of coronal holes in the period from 2010 to 2017
• Author: Veronika Jerčić
• Mentor: Giuliana Verbanac (mentor)
• Committee member: Giuliana Verbanac (predsjednik povjerenstva)
• Committee member: Snježana Markušić (član povjerenstva)
• Committee member: Antun Marki (član povjerenstva)
• Committee member: Maja Telišman Prtenjak (član povjerenstva)
• Committee member: Ivica Sović (član povjerenstva)
• Granter: University of Zagreb; Faculty of Science; (Department of Geophysics); Zagreb
• Defense date and country: 2019-09-25, Croatia
• Scientific / art field, discipline and subdiscipline: NATURAL SCIENCES; Geophysics; Other Geographic Disciplines

Abstract

U ovom radu analiziramo parametre brzog Sunčevog vjetra, kao i parametre izvora tog vjetra, koroninih šupljina na Suncu (površina u trenutku prelaska preko centralnog meridijana) te njihovu koreliranost s geomagnetskim indeksima. Koristimo podatke satelita u orbiti oko Lagrangeove točke L1 za parametre Sunčevog vjetra, dok su vrijednosti površina koroninih šupljina dobiveni pomoću EUV slika sa SDO/AIA. Vrijednosti geomagnetskih indeksa preuzeti su iz OMNI baze podataka. Istraživanje je pokazalo da postoji umjerena (do snažna) korelacija između geomagnetskih indeksa i parametara Sunčevog vjetra. BsV komponenta Sunčevog vjetra je najbolje opisana promjenom Dst indeksa (∆Dst), indeksi ap i Dst također najviše reagiraju na BsV, dok AE indeks najviše reagira na ukupno električno polje BV. To nas dovodi do zaključka da je geomagnetsku aktivnost moguće preciznije opisati i definirati poznavajući parametre nadolazećeg brzog Sunčevog vjetra. Koreliranost geomagnetskih indeksa i površine koroninih šupljina je slaba do toga da je nema, što upućuje na otežanu mogućnost procjene geomagnetske aktivnosti samo na temelju poznavanja površine koroninih šupljina.

Abstract (english)

In this work we analyze the parameters of the fast solar wind as well as the parameters of the source of that wind, coronal holes on the Sun (their surface in the moment of their passage over the central meridian) and their correlation with geomagnetic indices. We use the data from satellites in orbit around Lagrange point L1 for solar wind parameters, while the values of coronal hole surfaces where extracted from EUV images from SDO/AIA. Values of geomagnetic indices were taken from the OMNI database. This analysis showed that there is a moderate (up to strong) correlation between geomagnetic indices and the solar wind parameters. The BsV component of the solar wind is best described by the change of the Dst index (∆Dst), ap and Dst also respond the most to BsV, while AE reacts the most to the total electric feld of the solar wind, BV. That leads us to conclusion that geomagnetic activity can be more precisely described and de ned by knowing the parameters of the upcoming fast solar wind. On the other hand, the correlation between geomagnetic indices and the coronal hole surfaces is weak to non-existing, which means that assessing the geomagnetic activity solely on the basis of coronal hole surfaces would be a very challenging task.

• Keywords: geomagnetska aktivnost; Sunčev vjetar; koronine šupljine
• Keywords (english): geomagnetic activity; solar wind; coronal holes
• Language: croatian
• URN:NBN: urn:nbn:hr:217:793792
• Study programme: Title: Graduate university study pf Physics - Geophysics; specializations in: Seismology and Physics of the Earth's Interior, Meteorology and Physical Oceanography; Course: Seismology and Physics of the Earth's Interior; Study programme type: university; Study level: graduate; Academic / professional title: magistar/magistra fizike – geofizike (magistar/magistra fizike – geofizike)
• Type of resource: Text
• File origin: Born digital
• Access conditions: Open access
• Created on: 2019-10-02 09:45:25