Κατεύθυνση Αστροφυσική, Αστρονομία και Μηχανική (ΒΑΣΙΚΗ ΦΥΣΙΚΗ)
Library of the School of Science

2018-07-06

2018

Atsalis Marios

Παναγιώτα Πρέκα - Παπαδήμα, Επίκουρη Καθηγήτρια, Τμήμα Φυσικής, Εθνικό και Καποδιστριακό Πανεπιστήμιο Αθηνών
Ιωάννης Δαγκλής, Καθηγητής, Τμήμα Φυσικής, Εθνικό και Καποδιστριακό Πανεπιστήμιο Αθηνών
Αναστάσιος Αναστασιάδης, Διευθυντής Ερευνών, Εθνικό Αστεροσκοπείο Αθηνών

Μελέτη της διάδοσης των στεμματικών εκτινάξεων μάζας στο διαπλανητικό χώρο και της επίδρασής τους στο διαστημικό καιρό.

Greek

Propagation of Coronal Mass Ejections (CMEs) in the interplanetary medium and their impacts on Space Weather.

Space Weather refers to conditions on the Sun and in the solar wind, magnetosphere, ionosphere, and thermosphere that can influence the performance and reliability of space-borne and ground based technological systems and endanger human life. Coronal Mass Ejections (CMEs) are large expulsions of plasma and magnetic field from the Sun’s corona. Interplanetary Coronal Mass Ejections (ICMEs) and CME – Driven Shocks are two phenomena that are associated with CMEs in Heliosphere, whose impacts on Space Weather are crucial. Our purpose is to compare two Space Weather forecasting models. These models are the Drag Based Model and Shock Arrival model. They forecast the time of flight of an ICME and its impact velocity at 1 astronomical unit. Firstly, we collected ICMEs’ data from Ian Richardson and Hilary Cane list (2010). That list includes 499 events from 1996 until 2017. Then, we selected CMEs’ data from SoHO/LASCCO CME Catalogue and created a comprehensive table that contains all those useful parameters (CME speed, acceleration, mass, angular width etc.). Afterwards, we analyzed statistically those parameters and computed the real Time of Flight (ToF). The main part of our study is the extended comparison of the two models. We summarize that the Drag Based Model makes more accurate predictions about the time of flight and the impact velocity as well

Science

Physics

Space Weather, Coronal Mass Ejections, Drag Based Model, Shock Arrival Model

Yes

2

Yes

90

133

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https://pergamos.lib.uoa.gr/uoa/dl/object/2777368