A partial 45 MHz sky temperature map obtained from the observations of five ST radars

A sky temperature map at 45 MHz covering declination between +30 degrees an d +60 degrees is presented. The sampling in right ascension is 20 min (simi lar to5 degrees) and 2 degrees in declination in most of the map. The origi nality of the work was to use cosmic emission measurements from five VHF St ratosphere-Troposphere (ST) radars collected during long periods of routine meteorological surveys. This map, which has an accuracy in temperature of about 600 K, is intended first for radar reflectivity calibration and syste m performance monitoring. The presence of two strong radio sources, Cassiop eia A and Cygnus A, can also serve as the verification of the beam diagram, beam width, and beam pointing direction of the antenna. Finally, this work is an attempt to show the potentiality of ST radar for astronomical purpos es.