REGION OF CUSP-LIKE PRECIPITATION IN DAY SIDE HIGH-LATITUDES DURING STEADY MAGNETOSPHERIC CONVECTION

Steady magnetospheric convection intervals are characterized by stable configuration of the magnetospheric and ionospheric structures. Durin g such interval of 24 November 1981 the location and the configuration of the area of the cup-like particle precipitation were determined fr om the data of dayside passes of the NOAA satellites. The cusp-like pr ecipitation was found at invariant latitudes 72-75-degrees between 10 and 12 MLT. The ground based magnetic and radar data show that this re gion coincides with the dayside convection throat. All sky camera data show that short-lived sporadically appeared discrete auroral arcs bou nd the cusp region from the morning side and the long-lived stable dis crete arcs bound the cusp from the evening side. The cusp region coinc ides with the gap in the global distribution of discrete auroras. The cusp region lies polewards from the high-latitude boundary of the auro ral emission (at VUV wavelengths 123-160 nm) belt observed by the DE-1 imager.