Effect of Interplanetary Shocks on AL and Dst Indices

Details Effect of Interplanetary Shocks on AL and Dst Indices Effect of Interplanetary Shocks on AL and Dst Indices

Dec 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006agufmsm31a0287h&link_type=abstract

American Geophysical Union, Fall Meeting 2006, abstract #SM31A-0287

Physics

2139 Interplanetary Shocks, 2784 Solar Wind/Magnetosphere Interactions, 2788 Magnetic Storms And Substorms (7954), 7954 Magnetic Storms (2788)

Scientific paper

Analytic solar wind signals are constructed using data from the ACE satellite for the 3-6 October 2000 and 15-24 April 2002 geomagnetic storm events, which included interplanetary shocks and magnetic clouds. The WINDMI model is used to analyze the relative importance of the magnetic and pressure pulse structures in the solar wind on the AL and Dst geomagnetic indices. WINDMI is a well documented eight dimensional physics model of the solar wind driven magnetosphere-ionosphere system. The role of the shocks is shown by using analytic signals in which the shock feature in the density, solar wind velocity, and magnetic field magnitude are tested individually. WINDMI results from the analytic inputs show that the shock events strongly impacted the AL index values but only produced small changes in the Dst. In particular the first large -AL > 1300 nT spike during the October 2000 storm was triggered by the shock front (compression ratio: 2.3, shock speed: 530 km/s), and particularly by the jump in B\perp from 7 nT to 16 nT. The three AL peaks during the April 2002 storm are associated with three shock events. The second shock on 19 April at 0801 UT which produced an -AL peaks of -1824 nT and -1851 nT is most effective of the three shocks. The work is supported by NSF-ATM grant 0539099.

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