Panhellenic Conference Papers by Fiori Metallinou
Πρακτικά Πανελλήνιου Συνέδριου ΕΛ.ΙΝ.Α. “Ακουστική 2016. Αθήνα: Hellenic Institute of Acoustics, 2016
Ψηφιακά διαδραστικά περιβάλλοντα χρησιµοποιούνται στις µέρες µας όλο και περισσότερο όχι µόνο για... more Ψηφιακά διαδραστικά περιβάλλοντα χρησιµοποιούνται στις µέρες µας όλο και περισσότερο όχι µόνο για την ψυχαγωγία, αλλά και για την εκπαίδευση και ευαισθητοποίηση του χρήστη. Ως διαδραστικά ηχητικά περιβάλλοντα ορίζονται αυτά που χρησιµοποιούν ως βασικό φορέα της µεταδιδόµενης πληροφορίας τον ήχο, συνθήκη που αποδεδειγµένα προάγει τη µαθησιακή διαδικασία. Κατά το σχεδιασµό τους εφαρµόζονται τεχνικές ηχητικής αναπαράστασης δεδοµένων, οι οποίες επιτρέπουν τη µετατροπή µη-ηχητικής πληροφορίας σε ηχητική, έτσι ώστε ο χρήστης να αντιλαµβάνεται το ψηφιακό περιβάλλον και να αλληλεπιδρά µε αυτό µέσω της αίσθησης της ακοής. Στην παρούσα εισήγηση περιγράφονται αρχικά διαφορετικοί τρόποι, µε τους οποίους η διαδικασία της ηχητικής αναπαράστασης έχει εφαρµοστεί σε επιστηµονικά, µη-µουσικά δεδοµένα που εφάπτονται του πεδίου της Αστρονοµίας, και επειτα προτείνεται η ψηφιακή εφαρµογή 'Ακούγοντας τη Μαγνητική Καταιγίδα', ένα διαδραστικό περιβάλλον που βασίζεται στην ακουστική αντίληψη του χρήστη, για να τον επιµορφώσει σχετικά µε τη µεταβολή του γήινου µαγνητικού πεδίου λόγω της ηλιακής δραστηριότητας.
eng:
Digital interactive environments are nowadays increasingly used not only for entertainment, but also for promoting education and awareness. Interactive audio environments employ sound as primary carrier of the conveyed information, a characteristic that has been proven to enhance the learning process. For their design sonification techniques are used, which facilitate the transformation of non-audio to audio data. Thus, users perceive the digital environment and interact with the system by focusing on their sense of hearing. This paper provides first a description of the ways, in which sonification has been applied on scientific, non-audio data in the field of Astronomy, and then proposes the digital application 'Hearing the Magnetic Storm', an interactive environment that relies on the users' aural perception in order to educate them on the transformation of Earth's magnetic field caused by the Sun's activity.
Papers by Fiori Metallinou
Development and recovery of magnetic storus in geospace
Magnetic storms and magnetospheric substorms are the most frequent mechanisms of magnetospheric a... more Magnetic storms and magnetospheric substorms are the most frequent mechanisms of magnetospheric activity. In this Thesis we study the substorm influence to the magnetic storm development, a study that contributes to the “storm-substorm relationship” issue. We follow two ways for approaching the above issue: The first one is through a study of the geomagnetic indices SYM-H and AL, which are used to measure storm and substorm intensity, respectively. We selected intervals of significant geomagnetic activity and used the time series of the respective storm and substorm indices. Our aim was to estimate the energy density associated with storms and substorms and the correlation between these two quantities. This work led us to the result that the energy density variation of magnetic storms is highly correlated with the energy density variations of magnetosheric substorm (during the same time intervals) and thus magnetospheric substorms have the potential to influence storm development. T...
The Influence of Substorm-Induced Electric Fields on the Build-up of Particle Radiation during Geospace Magnetic Storms
AIP Conference Proceedings, 2006
The enhanced magnetospheric convection electric field and the substorm‐induced electric fields ar... more The enhanced magnetospheric convection electric field and the substorm‐induced electric fields are the drivers of plasma acceleration during geospace magnetic storms. The relative influence of the two drivers on the development of the storm‐time ring current is the topic of this study. We use a three‐dimensional dynamic ion‐tracing model, to construct maps of the temporal and spatial variations of ion− number densities in the inner magnetosphere. Outflowing ionospheric oxygen ions and protons are traced under two distinct scenarios: in the first case, we follow their transport and acceleration under the influence of a large convection electric field only. In the second case, we add an impulsive electric field due to magnetic field dipolarization, as observed by spacecrafts during substorm expansion. Our aim is to evaluate the contribution of substorms to the build‐up of particle radiation in the inner magnetosphere.
2008 IEEE International Symposium on Parallel and Distributed Processing, 2008
In this paper we investigate the applicability of classic dynamic loop scheduling methods on a nu... more In this paper we investigate the applicability of classic dynamic loop scheduling methods on a numerical simulation code that calculates the trajectories of charged particles in the earth's magnetosphere. The numerical application under consideration investigates the influence of substorm-induced electric fields that cause magnetospheric disturbances, responsible for severe hazards in human activities and technology infrastructures in the near-earth space environment. The computational time to simulate the motion of each particle is dependent on the inital conditions applied and may greatly vary between different particles. This fact leads to great load imbalances in parallel execution scenarios and thus to degraded overall performance. For this reason we apply dynamic scheduling techniques to load-balance the tasks in homogeneous, heterogeneous and loaded distributed-memory parallel platforms and select the most appropriate among the available strategies.
IEEE Transactions on Plasma Science, 2004
IEEE Transactions on Plasma Science, 2004
Acceleration of charged particles is an essential ingredient of both magnetospheric substorms and... more Acceleration of charged particles is an essential ingredient of both magnetospheric substorms and geospace magnetic storms, and is a critical part of space weather. In the case of geospace storms, the ultimate result of particle acceleration is a bulk flow of electric charge through the inner magnetosphere, commonly known as the ring current. This paper is a critical review of the long-standing issue of the storm-substorm relationship, or, in other words, the capability or the necessity of substorms in the build-up of a storm-time ring current. We mainly address the physical effect itself, (e.g., the bulk acceleration of particles), and not the diagnostic of the process, (e.g., the index), which has been the case very often. Within the framework of particle acceleration, substorms retain their storm-importance due to the acceleration potential of substorm-induced impulsive electric fields.
Acta Geophysica, 2009
Comprehensive understanding of the dynamics of the coupled solar wind-magnetosphere-ionosphere sy... more Comprehensive understanding of the dynamics of the coupled solar wind-magnetosphere-ionosphere system is of utmost interest, both from the perspective of solar system astrophysics and geophysics research and from the perspective of space applications. The physical processes involved in the dynamical evolution of this complex coupled system are pertinent not only for the Sun-Earth connection, but also for major phenomena in other astrophysical systems. Furthermore, the conditions in geospace collectively termed space weather affect the ever increasing technological assets of mankind in space and therefore need to be understood, quantified and efficiently forecasted. The present collaborative paper communicates recent advances in geospace dynamic coupling research through modeling, simulations and data analysis and discusses future directions.
SpaceGates Academy: Teaching science communication and outreach of Astronomy, Planetary and Space Science to Physics Students
Uploads
Panhellenic Conference Papers by Fiori Metallinou
eng:
Digital interactive environments are nowadays increasingly used not only for entertainment, but also for promoting education and awareness. Interactive audio environments employ sound as primary carrier of the conveyed information, a characteristic that has been proven to enhance the learning process. For their design sonification techniques are used, which facilitate the transformation of non-audio to audio data. Thus, users perceive the digital environment and interact with the system by focusing on their sense of hearing. This paper provides first a description of the ways, in which sonification has been applied on scientific, non-audio data in the field of Astronomy, and then proposes the digital application 'Hearing the Magnetic Storm', an interactive environment that relies on the users' aural perception in order to educate them on the transformation of Earth's magnetic field caused by the Sun's activity.
Papers by Fiori Metallinou