Test of Complexity in the Magnetospheric System Via Auroral Observations

Details Test of Complexity in the Magnetospheric System Via Auroral Observations Test of Complexity in the Magnetospheric System Via Auroral Observations

Dec 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001agufmsm21a0767c&link_type=abstract

American Geophysical Union, Fall Meeting 2001, abstract #SM21A-0767

Physics

2700 Magnetospheric Physics

Scientific paper

There is recent evidence indicating that the magnetosphere may be a complex system with a low dimension and a long range correlation. These characteristics were obtained by previous studies using mostly time series of geomagnetic indices such as the AE and AL indices. There are, however, inherit limitations in the construction of these indices which may hinder an accurate assessment on the nature of this system's complexity. A study of auroral brightness and size distributions, which can reveal modes of energy release and transport within the magnetosphere, offers another independent means to evaluate the system. A previous study of auroral luminosity based on global auroral images from the Ultra-Violet Imager on the Polar satellite during the month of January, 1997 has provided indications that the brightness and size distributions of auroral luminosity are consistent with the magnetosphere behaving like a system near criticality. In this paper, we test the robustness of previous findings with extended analysis of six months of auroral observations. We examine the sensitivity of the power law slope and the prominent peak seen previously in these distributions to the different activity levels of the magnetosphere and threshold level adopted in the analysis. We also studied the impact of IMF orientation on the resulting power spectral density of brightnesses and size distributions. The implications of these results will be discussed.

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