The 9.1-cm radio sun at the time of the eclipse of July 20, 1963, had two radio plages. One, of moderate importance, was located near the east limb at 58° ± 2°E and 10° ± 2°N. It had a flux density of about 5 × 10−22 watt m−2(c/s)−1 and an angular size in the east-west direction of 1.5′. The brightness temperature was 1 × 106 °K (effective value for a uniform circular source 1.5′ in diameter). The other was of much lower intensity and was located near the west limb at 80° ± 10°W and 4° ± 2°N. Its flux density was about 2 × 10−22 watt m−2(c/s)−1, and its size less than 3.5′ in both north-south and east-west directions.
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