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Session: Heliophysics and the Solar System

Name: Dr. Georgios Balasis (National Observatory of Athens)
Coauthors: Boutsi Adamantia Zoe (NOA; NKUA)
Papadimitriou Constantinos (NOA; NKUA)
Potirakis Stelios (UNIWA)
Pitsis Vasilis (NKUA)
Daglis Ioannis A. (NKUA)
Anastasiadis Anastasios (National Observatory of Athens)
Giannakis Omiros (National Observatory of Athens)
Type: Poster
Title: Investigation of Dynamical Complexity in Swarm-Derived Geomagnetic Activity Indices Using Information Theory
Abstract:

In 2023, ESA Swarm constellation mission celebrates 10 years in orbit, offering one of the best-ever surveys of the topside ionosphere. Among its achievements, it has been recently demonstrated that Swarm data can be used to derive space-based geomagnetic activity indices, similar to the standard ground-based geomagnetic indices monitoring magnetic storm and magnetospheric substorm activity. Recently, many novel concepts originated in time series analysis based on information theory have been developed, partly motivated by specific research questions linked to various domains of geosciences, including space physics. Here, we apply information theory approaches (i.e., Hurst exponent and a variety of entropy measures) to analyze the Swarm-derived magnetic indices from 2015, a year that includes 3 out of 4 most intense magnetic storm events of the previous solar cycle, including the strongest storm of solar cycle 24. We show the applicability of information theory to study the dynamical complexity of the upper atmosphere, through highlighting the temporal transition from the quiet-time to the storm-time magnetosphere, which may prove significant for space weather studies.