Physics
Scientific paper
Sep 2001
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001jastp..63.1387p&link_type=abstract
Journal of Atmospheric and Solar-Terrestrial Physics, Volume 63, Issue 13, p. 1387-1397.
Physics
11
Scientific paper
Recently, it has been proposed that the dynamics of the global geomagnetic current system are consistent with a self-organized critical (SOC) state. Based on that idea, sandpile models of the auroral electrojet index /AE have been constructed and compared with data. The Hurst /R/S statistic is a powerful test for the presence of SOC, which is applied to /AE time series. Those results are compared with the results of the /R/S statistic for both the solar wind time series (Bz, vsw, etc.) and auroral oval magnetometer time series. We find that the solar wind acts as if it was in a SOC state, and that the /AE index time series indicates that /AE is in a nearly identical SOC state. We cannot rule out the possibility that the /AE results, which are the response to the solar wind, are a reflection of the solar wind SOC state. However, the local measures (ground station magnetometer readings; ground station dynamical signals) give evidence of a different type of SOC state within the magnetosphere.
Newman David E.
Price Channon P.
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