Physics
Scientific paper
Dec 2006
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006agufmsa41a1403h&link_type=abstract
American Geophysical Union, Fall Meeting 2006, abstract #SA41A-1403
Physics
2409 Current Systems (2721), 2431 Ionosphere/Magnetosphere Interactions (2736), 2736 Magnetosphere/Ionosphere Interactions (2431), 2778 Ring Current, 2788 Magnetic Storms And Substorms (7954)
Scientific paper
We selected the main phases of 17 magnetic storms between 1999 and mid-2005 for analysis. Our three criteria for selection were: (1) the availability of solar wind measurements from the Advanced Composition Explorer (ACE) satellite, (2) a minimum Dst below -100 nT, and (3) no significant recovery episode between the beginning and maximum epoch of the main phase (d(Dst)/dt less than 0). We combined the Volland-Stern and Siscoe-Hill models to estimate the intensities of electric fields (EVS) in the equatorial plane of the inner magnetosphere. Here EVS is the polar cap potential divided by the width of the magnetosphere along the dawn-dusk axis. A survey of Dst and EVS traces from January 1999 to July 2005 shows that all sustained excursions of EVS above background levels were closely tied to the main phases of storms. That is, EVS returned to background levels at or near the beginning of all recovery phases. The data indicate very high correlations between Dst and the quantity IVS = integrated (EVS) during the selected main phases. Limits of applicability for the Volland-Stern and Siscoe-Hill models are critically discussed.
Burke William J.
Gentile Louise C.
Huang Chang-Yin
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