Substorm Dynamics as Observed by RPI and FUV on IMAGE

J. L. Green, S. F. Fung, R. E. Benson, H. Frey, S. Mende, J. L.Burch,
P. H. Reiff, and B. W. Reinisch

The Imager for Magnetopause-to-Aurora Global Exploration (IMAGE)
spacecraft is well suited to make unique observations of the aurora and
associated radio emissions during substorms.  Simultaneous data from the
Radio Plasma Imager (RPI) instrument and the Far Ultraviolet (FUV)
instrument on IMAGE will be used to study auroral zone dynamics.  The
FUV investigation provides simultaneous views of the aurora with the
Wideband Imaging Camera (WIC, N_2 LBH 140-170 nm region), the
Spectrographic Imager SI12 channel (imaging proton precipitation induced
Doppler shifted Lyman alpha), and the SI13 channel (imaging the 135.6 nm
OI and underlying LBH lines). FUV was designed to observe the location
and intensity of the aurora over the entire auroral zone. In addition to
radio sounding, the RPI measures the dynamic spectra of a variety of
emissions associated with the aurora every few minutes. Several
substorms have been selected for a detailed comparison between FUV and
RPI data. FUV observations of the aurora are used during the times when
IMAGE is at apogee and well-situated in the AKR emission cone.  Harmonic
AKR is observed on a number of passes.