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http://hdl.handle.net/2122/12165
Authors: | Alberti, Tommaso* Consolini, Giuseppe* De Michelis, Paola* Laurenza, Monica* Marcucci, Maria Federica* |
Title: | On fast and slow Earth’s magnetospheric dynamics during geomagnetic storms: a stochastic Langevin approach | Journal: | Journal of Space Weather and Space Climate | Series/Report no.: | / 8 (2018) | Issue Date: | 2018 | DOI: | 10.1051/swsc/2018039 | URL: | https://www.swsc-journal.org/articles/swsc/abs/2018/01/swsc180035/swsc180035.html | Keywords: | Earth's magnetospheric dynamics geomagnetic storms and substorms geomagnetic indices space weather |
Subject Classification: | 01.03. Magnetosphere 04.05. Geomagnetism |
Abstract: | Abstract – The Earth’s magnetosphere responds to the external changes of interplanetary magnetic field and solar wind conditions showing a multiscale dynamics, manifesting in the occurrence of fluctuations over a very wide range of timescales. Here, using an approach based on a Langevin/Fokker-Planck description we investigate the nature of the fast (short-) and slow (long-timescale) fluctuations of SYM-H index during geomagnetic storms. The results point towards a different origin of the fast (s < 200 min) and slow (s > 200 min) fluctuations, which are characterized by state functions of different nature. In detail, the state function associated with the slow dynamics shows the evidence of the occurrence of first-order-like topological phase transition during the different phases of a geomagnetic storm, while the fast dynamics seems to be characterized by a quasi-invariant quadratic state function. A modeling in terms of stochastic Langevin equation is discussed and the relevance of our results in the framework of Space Weather studies is outlined. |
Appears in Collections: | Article published / in press |
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File | Description | Size | Format | |
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SWSC_2018.pdf | 2.55 MB | Adobe PDF | View/Open |
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