The Dependence of Ring Current Asymmetry on the Phase of Magnetic Storms

Details The Dependence of Ring Current Asymmetry on the Phase of Magnetic Storms The Dependence of Ring Current Asymmetry on the Phase of Magnetic Storms

Dec 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003agufmsm52a0562m&link_type=abstract

American Geophysical Union, Fall Meeting 2003, abstract #SM52A-0562

Physics

2708 Current Systems (2409), 2730 Magnetosphere: Inner, 2778 Ring Current, 2784 Solar Wind/Magnetosphere Interactions, 2788 Storms And Substorms

Scientific paper

We utilize the 1-minute resolution Asym and Sym indices for the horizontal component H to study the dependence of ring current asymmetry on the phase of magnetic storms. We find that the ratio Sym-H/Asym-H decreases during the recovery phase suggesting that the ring current is becoming relatively more asymmetric. This result contradicts theoretical expectations and previous experimental results. It suggests that there may be problems with the current operational definition of these quantities. We have examined the possibility that dynamic pressure effects in Sym-H or a constant bias in Asym-H can explain these results. Neither correction can account for our observations. In this paper we will use the original magnetograms and alternative definitions of asymmetry to see if the problem lies in the current procedure for calculating the index. We will illustrate our results using storms from the NSF GEM campaigns that have been numerically modeled.

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