Dr. Georgios Balasis
Institute for Astronomy, Astrophysics, Space Applications and Remote Sensing, National Observatory of Athens, I. Metaxa & Vas. Pavlou St., GR-15236 Penteli, Greece
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30Years (1997-Present)
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Representative Publications
View All Publications10 February 2006 in Journal of Geophysical Research
Journal Article
1 March 2017 in Earth and Planetary Science Letters
Journal Article
ASA. De Santis
A. De Santis
Georgios BalasisFPF. Javier Pavón-Carrasco
F. Javier Pavón-CarrascoGCG. Cianchini
G. Cianchini
MMM. Mandea
M. Mandea
Journal Article
Georgios BalasisRDReik Donner
Reik Donner
Stelios M. PotirakisJRJakob Runge
Jakob RungeCPConstantinos Papadimitriou
Constantinos PapadimitriouJKJürgen Kurths
Jürgen Kurths +2
This review provides a summary of methods originated in (non-equilibrium) statistical mechanics and information theory, which have recently found successful applications to quantitatively studying complexity in various components of the complex system Earth. Specifically, we discuss two classes of methods: (i) entropies of different kinds (e.g., on the one hand classical Shannon and R´enyi entropies, as well as non-extensive Tsallis entropy based on symbolic dynamics techniques and, on the other hand, approximate entropy, sample entropy and fuzzy entropy); and (ii) measures of statistical interdependence and causality (e.g., mutual information and generalizations thereof, transfer entropy, momentary information transfer). We review a number of applications and case studies utilizing the above-mentioned methodological approaches for studying contemporary problems in some exemplary fields of the Earth sciences, highlighting the potentials of different techniques.
21 December 2006 in Annales Geophysicae
Journal Article
Georgios BalasisIDIoannis Daglis
Ioannis DaglisPKP. Kapiris
P. Kapiris
MMM. Mandea
M. Mandea
DVD. Vassiliadis
D. Vassiliadis
KEK. Eftaxias
K. Eftaxias
We show that distinct changes in scaling parameters of the Dst index time series occur as an intense magnetic storm approaches, revealing a gradual reduction in complexity. The remarkable acceleration of energy release – manifested in the increase in susceptibility – couples to the transition from anti-persistent (negative feedback) to persistent (positive feedback) behavior and indicates that the occurence of an intense magnetic storm is imminent. The main driver of the Dst index, the VBSouth electric field component, does not reveal a similar transition to persistency prior to the storm. This indicates that while the magnetosphere is mostly driven by the solar wind the critical feature of persistency in the magnetosphere is the result of a combination of solar wind and internal magnetospheric activity rather than solar wind variations alone. Our results suggest that the development of an intense magnetic storm can be studied in terms of "intermittent criticality" that is of a more general character than the classical self-organized criticality phenomena, implying the predictability of the magnetosphere.
10 June 2009 in Journal of Geophysical Research
Journal Article
Georgios BalasisIDIoannis Daglis
Ioannis DaglisCPConstantinos Papadimitriou
Constantinos PapadimitriouMKMaria Kalimeri
Maria Kalimeri
AAAnastasios Anastasiadis
Anastasios AnastasiadisKEKonstantinos Eftaxias
Konstantinos Eftaxias
26 May 2007 in Geochemistry, Geophysics, Geosystems
Journal Article
SMStefan Maus
Stefan MausHLHermann Lühr
Hermann Lühr
MRMartin Rother
Martin Rother
KHKumar Hemant
Kumar Hemant
Georgios BalasisCSClaudia Stolle
Claudia Stolle +1
About Me
Dr. Georgios Balasis is a Research Director of the Institute for Astronomy, Astrophysics, Space Applications and Remote Sensing (IAASARS) at the National Observatory of Athens (NOA), Greece. Dr. Balasis received a BSc in Physics from the University of Athens (Greece) in 1995, followed by an MSc in Research with Distinction in Geophysics from the University of Edinburgh (UK) in 1997, an MSc in Condensed Matter Physics in 1998 and a PhD in Applied Electromagnetism in 2001 both from the University of Athens. From 2002 to 2006 he was the specialist for global electromagnetic induction on the CHAMP satellite team at GeoForschungsZentrum (GFZ) Potsdam, Germany. He returned to Greece in 2006 as an Assistant Researcher at the former Institute for Space Applications and Remote Sensing (ISARS) at NOA.
He continues to be involved in magnetic satellite missions; in particular, he is a member of the Data Quality Group and Validation Team of the Swarm satellite mission of the European Space Agency (ESA). His primary interest lies in Space Physics, with a focus on magnetosphere-ionosphere coupling and space weather using information theory approaches and complex systems methods. He currently serves as an Editor for the MDPI journals Atmosphere, Geosciences, and Heritage.