Substorm onset location and the Harang discontinuity

Details Substorm onset location and the Harang discontinuity Substorm onset location and the Harang discontinuity

Dec 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005agufmsm31a0386s&link_type=abstract

American Geophysical Union, Fall Meeting 2005, abstract #SM31A-0386

Physics

2721 Field-Aligned Currents And Current Systems (2409), 2731 Magnetosphere: Outer, 2776 Polar Cap Phenomena, 2790 Substorms

Scientific paper

In this study we investigate the relation of auroral substorm onset to the Harang discontinuity. With a database of over 3300 onsets determined from auroral images we will statistically examine the MLat and MLT location of the onset with respect to the location of the Harang discontinuity as determined with data from the IMAGE magnetometer network. We define the location of the Harang discontinuity as the transition from eastward to westward currents at the latitude of the main auroral electrojet flow. This work will address the long standing question of whether the substorm onset is initiated equatorward of the Harang discontinuity within the eastward electrojet region as proposed by Baumjohann [1983].

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