Observational Verification of Critical Scaling Features of Magnetospheric Activity

Details Observational Verification of Critical Scaling Features of Magnetospheric Activity Observational Verification of Critical Scaling Features of Magnetospheric Activity

May 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001agusm..sm61b09u&link_type=abstract

American Geophysical Union, Spring Meeting 2001, abstract #SM61B-09

Physics

7839 Nonlinear Phenomena

Scientific paper

It is known that the Earth's magnetosphere is able to produce scale-free spatiotemporal instabilities with power-law correlation functions that can be interpreted in terms of the self-organized criticality (SOC) concept. In the present study, the critical dynamics of the magnetosphere is analyzed experimentally based on the ultraviolet auroral imaging technique as well as the time series analysis of global magnetospheric indices and relevant solar wind characteristics. We show that the temporal-spatial evolution of auroral perturbations exhibits scale-invariant features consistent with the behavior of a general class of statistical physical models in the vicinity of a stationary critical point. We demonstrate that the ensemble averaged temporal behavior of the perturbations obeys power-law relations which differ essentially from the scaling relations describing the solar wind dynamics. We also reveal a distinct algebraic correlation between the lifetime and the sizes of the auroral perturbations characteristic of SOC systems. The results obtained support the idea of SOC as a possible mechanism of multiscale fluctuations in the magnetosphere.

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