Unit:
Τομέας Αστροφυσικής, Αστρονομίας και ΜηχανικήςLibrary of the School of Science
Author:
Δημητροπούλου Μιχαήλα
Dissertation committee:
Μουσάς Ξενοφών Καθηγητής ΕΚΠΑ (επιβλέπων), Πρέκα Παναγιώτα Επίκ. Καθηγήτρια ΕΚΠΑ, Αλυσσανδράκης Κωνσταντίνος Καθηγητής Πανεπιστημίου Ιωαννίνων
Original Title:
Ολοκληρωμένο μοντέλο προσομοίωσης ηλιακών εκλάμψεων
Translated title:
Integrated flare model
Summary:
This dissertation highlights the applicability of the SOC approach to the
transient energy release events in the solar corona. Concerning the variability
of the probability distribution functions’ exponents of the solar flares’
parameters related with the Rieger periodicity we develop an enhanced detection
method based on the Scargle-Lomb periodogram and the Weighted Z wavelet
transform, which shows that the Rieger periodicity is detectable also in weak
flares without any privileged wavnumber in the propagation of the Rossby waves,
which are assumed to be the cause for such periodicities. Regarding the
fractality of solar flares, we investigate the correlation between the
photospheric and the coronal structures through a non-linear force-free
extrapolation of the magnetic field and the box-counting method, without
finding any correlation due to the highly non-linear phenomena taking place in
the low corona. Finally, we develop the static and the dynamic Integrated Flare
Model based on cellular automata with driving and diffusion rules, which lead
the simulated active regions to reach the state of the Self-Organized
Criticality. Through this process we reproduce all the statistical properties
of the solar flares, which are derived from the so far known observational
studies.
Keywords:
Solar flares, Photosphere, Solar corona, Self- Organized Criticality, Cellular Automata
Number of index pages:
ix-xxiv
Number of references:
291
Number of pages:
[2], xxiv, 251
