Scaling in the space climatology of the auroral indices: Is SOC the only possible explanation ?

Details Scaling in the space climatology of the auroral indices: Is SOC the only possible explanation ? Scaling in the space climatology of the auroral indices: Is SOC the only possible explanation ?

2002-04-19

arxiv.org/abs/astro-ph/0204338v2

Astronomy and Astrophysics

Astrophysics

24 pages including 7 figures. Based on an invited talk given at the IAGA meeting in Hanoi, Vietnam, August 2000. Retitled v2 h

Scientific paper

10.5194/npg-9-389-2002

The study of the robust features of the magnetosphere is motivated both by new "whole system" approaches, and by the idea of "space climate" as opposed to "space weather". We enumerate these features for the AE index, and discuss whether self-organised criticality (SOC) is the most natural explanation of the "stylised facts" so far known for AE. We identify and discuss some open questions, answers to which will clarify the extent to which AE's properties provide evidence for SOC. We then suggest an SOC-like reconnection-based scenario drawing on the result of Craig(2001) as an explanation of the very recent demonstration by Uritsky et al(2001b) of power laws in several properties of spatiotemporal features seen in auroral images.

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