Coupling of Solar Wind Triggers to the Release of Stored Magnetospheric Energy, including the Role of Preconditioning

Details Coupling of Solar Wind Triggers to the Release of Stored Magnetospheric Energy, including the Role of Preconditioning Coupling of Solar Wind Triggers to the Release of Stored Magnetospheric Energy, including the Role of Preconditioning

Dec 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006agufmsm31a0299l&link_type=abstract

American Geophysical Union, Fall Meeting 2006, abstract #SM31A-0299

Physics

2740 Magnetospheric Configuration And Dynamics, 2764 Plasma Sheet, 2784 Solar Wind/Magnetosphere Interactions, 2790 Substorms

Scientific paper

Solar wind energy transferred to the magnetosphere can be released either steadily, as occurs during steady magnetospheric convection (SMC) intervals, or impulsively, as occurs during substorm and dynamic pressure (DP) disturbances. To model and predict the relations between the solar wind and disturbances of the magnetosphere-ionosphere system, it is necessary to understand what solar wind conditions cause SMCs, DPs, what conditions do not, and why. We will describe the interplanetary magnetic field (IMF) and solar wind dynamic pressure P changes that lead, and do not lead, to substorms and DPs, and we will include specification of preconditioning that is important for determining whether a disturbance will be triggered, and if so, which type will occur. We will also describe important interplay from simultaneous IMF and dynamic pressure changes that either can lead to enhanced energy release from disturbances that include both the substorm and DP responses or can prevent substorm triggering, leading to "null" events. We will furthermore show observational evidence that appropriate close-together solar wind changes can terminate substorm energy release, leading to pseudo-substorms (also referred to as "pseudo breakups), and that SMCs require steady solar wind and IMF conditions but do not require pre-conditioning, such as by a substorm.

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