Precipitating particle data from the DMSP F12 and F13 satellites has been
merged with image intensities from the Ultraviolet Imager (UVI) on the Polar
satellite. UVI and EC imagers were combined within single transpolar passes of
the DMSP F12 and F13 satellites. Intensities of the pixels were then averaged into
1° x 1° bins along the satellite tracks, thus generating along-track intensity profiles.
Similarly, particle data were averaged into 1° bins along the trajectory to form
energy precipitation profiles. The inbound (ascending in latitude) and outbound
(descending in latitude) peaks in each set of profiles were isolated in order to
compare imager photon flux with particle energy flux. The particle data and image
intensity data of hundreds of peaks were linearly correlated for January-February
1997 when the northern polar regions were in darkness and dayglow effects were
minimal. In the pre-midnight quadrant, good correlations (r ~ 0.80) arise between
the photon and electron energy fluxes, while correlations for other sectors are not as
good, perhaps because the latter sectors do not present as large a range in energy
fluxes of >200 eV particles as the pre-midnight sector. The high correlation in the
pre-midnight sector suggests that UVI fluxes can be directly calibrated to measure
energy input without the additional complication of modeling. Using this
calibration, global maps of energy input into the aurora may be derived empirically.