Investigation of the conjugacy between auroral breakup and energetic electron injection

Auroral TV observations at Loparskaya, Kola Peninsula, and CRRES energetic electron and proton measurements during a moderate isolated substorm at 200 0-2100 UT on February 13, 1991, are compared. The CRRES was at the apogee o f orbit 494 in the outer radiation belt near the magnetic equator. CRRES fo otprint projection estimated by using a Tsyganenko magnetic field model was situated at the same latitudes several degrees eastward of active aurora d uring the substorm breakup or the intensification. The intensification cons ists of several activations of 1- min duration, and this fine spatial and t emporal structure is important for the conjugacy investigations. It is show n that injected energetic electrons have been accelerated at the same time as one of the auroral activations at the same latitude and approximately th e same azimuthal extended region. The lack of enhanced electrons during oth er activations suggests that the acceleration region has a sharp equatorial boundary.