Annales Geophysicae (2001) 19: 863–871 c © European Geophysical Society 2001

Abstract. A sky temperature map at 45 MHz covering dec-lination between +30 ◦ and +60 ◦ is presented. The sampling in right ascension is 20 min (∼5◦) and 2 ◦ in declination in most of the map. The originality of the work was to use cosmic emission measurements from five VHF Stratosphere-Troposphere (ST) radars collected during long periods of rou-tine meteorological surveys. This map, which has an accu-racy in temperature of about 600 K, is intended first for radar reflectivity calibration and system performance monitoring. The presence of two strong radio sources, Cassiopeia A and Cygnus A, can also serve as the verification of the beam di-agram, beam width, and beam pointing direction of the an-tenna. Finally, this work is an attempt to show the potential-ity of ST radar for astronomical purposes. Key words. Meteorology and atmospheric dynamics (instru-ments and techniques) – Radio science (radio astronomy)