Paper#: 146
Poster #: 12
Session Name: Poster Session 1
Room: East Ballroom
Day: Tuesday
Time: 10:10 a.m.-Noon
Abstract Title: Azimuthal Substorm Propagation Inferred from an L-Shell Chain of Ground-Based Magnetometers
PresentSurname: Jackel, B.J.
All Authors: B.J. Jackel, E.F. Donovan
Abstract : In this study we examine the azimuthal (longitudinal) propagation of ionospheric substorm current systems. We use 5-second magnetometer data from five Canopus sites located at L=6-7 and spanning more than three hours of local time. This allows us to distinguish between localized events and those which are more global in nature. An extended data set (more than 10 years) allows us to identify numerous instances of isolated substorms. Correlation techniques are applied to estimate delays between impulsive signatures observed at multiple sites. These delays are interpreted as corresponding to the propagation speed of substorm related ionospheric currents. We present statistics of propagation speed and direction along with relevant solar wind and geostationary magnetic field parameters.