Modeling magnetotatail field during substorm dipolarizations

Details Modeling magnetotatail field during substorm dipolarizations Modeling magnetotatail field during substorm dipolarizations

Dec 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009agufmsm54b..02k&link_type=abstract

American Geophysical Union, Fall Meeting 2009, abstract #SM54B-02

Physics

[2704] Magnetospheric Physics / Auroral Phenomena, [2716] Magnetospheric Physics / Energetic Particles: Precipitating, [2740] Magnetospheric Physics / Magnetospheric Configuration And Dynamics, [2790] Magnetospheric Physics / Substorms

Scientific paper

We present a new plasma equilibrium model suitable for describing stretched magnetotail configurations near midnight. This model can be conveniently constrained for specific events using Meridional Scanning Photometer (MSP) measurements of the boundaries of auroral emissions associated with proton (486.1 nm) and electron (630.0 nm) precipitation. Additional constrains can come from in-situ measurements of magnetic field and plasma temperature and density by satellites. We use the event of December 10, 1996, for which there is excellent ground-based optical data, as an example to study substorm dipolarization. The constrained model for this event shows a radially localized transition from dipole-like to tail-like magnetic field topologies. Recent studies using primarily ground-based observations of auroral precipitation have led researchers to postulate that this this radially localized topology transition is necessary for explaining the spatio-temporal evolution of the dispersionless injection. Our model provides us with a magnetic field that we believe is appropriate for the growth-phase expansion-phase transition, and is thus ideal for numerically exploring the physics of how dispersionless injection begins at substorm onset. We use our model to calculate dynamics of magnetotail electrons and ions and compare the resulting injections with the available riometer data.

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