Global Auroral Imaging:  Dynamic Pressure Induced Auroral Brightenings and 
Conjugate Auroral Observations.

Global auroral images acquired with Earth-orbiting spacecraft allow the 
monitoring of the global changes of the magnetosphere.  The Visible Imaging 
System (VIS) on the Polar spacecraft of the NASA Goddard Space Flight 
Center has been used to observe the response of the global auroral oval to 
large dynamic pressure changes in the solar wind impinging on the nose of 
the magnetosphere.   Recently, the motion of the line of apsides of the 
Polar spacecraft orbit has allowed simultaneous viewing of the nighttime 
sectors of the northern and southern auroral ovals with a single 
camera.  The presentation will include examples of both sets of 
observations and a discussion of the implications for the magnetosphere.