A Case Study of an Active Aurora Observed by Monochromatic Auroral TV on the Ground and Particle Analyzers on Board the EXOS-C Satellite

Abstract

The monochromatic auroral images obtained by TV cameras in digital form make it possible to compare the spectral distribution of auroral photoemissions of active auroras with those of auroral particles measured by the EXOS-C satellite accurately. The joint data set of the monochromatic auroral images and the incoming auroral particles show that there is almost one to one correspondence between the distribution of particle precipitation and auroral photoemission. The auroral intensity ratios of I (5577Å)/I(6300Å) in an active discrete arc and in an quiet discrete arc show quite different values. The peak energies in the differential electron flux measured above these two discrete arcs agree well with the theoretical values based on the measured intensity ratios.