A Comparison of The Location of The Central Meridian of Substorm Current Wedge with Auroral Images and Geosynchronous Observations

Details A Comparison of The Location of The Central Meridian of Substorm Current Wedge with Auroral Images and Geosynchronous Observations A Comparison of The Location of The Central Meridian of Substorm Current Wedge with Auroral Images and Geosynchronous Observations

Dec 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005agufmsm31a0396h&link_type=abstract

American Geophysical Union, Fall Meeting 2005, abstract #SM31A-0396

Other

2721 Field-Aligned Currents And Current Systems (2409), 2740 Magnetospheric Configuration And Dynamics, 2790 Substorms

Scientific paper

One of the major difficulties in determining the spatial extent of current disruption associated with the substorm current wedge is due to the fact that satellites are rarely positioned properly to distinguish azimuthal from radial structures. Even if we observe a time delay between dipolarization signatures at two satellites located close to each other, it is sometimes difficult to determine whether this time delay is due to radial or azimuthal expansion of the tail current disruption associated with the substorm current wedge. In order to accurately determine the dipolarization onset time, it is necessary to know where the satellite is positioned relative to the substorm current wedge. Several methods can help us to determine the central meridian of substorm current wedge. The easiest one uses the auroral images. The bright surge like western termination of the bulge is associated with the upward field-aligned current. The comparison of auroral images from the IMAGE and POLAR UVI satellites can give us a crude estimation of where the substorm current wedge is located relative to the GOES satellites. However, a more convenient method is to invert ground magnetometer data to obtain the parameters of a model current system that gives the best fit to the observed magnetic perturbations. The model currents include three components: the substorm current wedge, symmetric ring current and partial ring current. This inversion method is capable of obtaining the intensity as well as the longitudinal boundaries of the substorm current wedge with accuracy better than 0.5 hour MLT. There are more than 40 mid-latitude stations available during fall 2001 and 2002. MEASURE, SMALL, 210 MM and INTERMAGNET are arrays with many stations. We have established a substorm onset list for the fall 2001. This substorm list will be used as a basis for the development of the inversion code to determine the central meridian of substorm current wedges. The estimated central meridian of substorm current wedge will be compared with auroral images and geosynchronous observations. The accuracy and relative timing between these observations will be examined.

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