Active Region Flare Rates and 8.6 mm Brightness Temperatures,
HARVARD COLL OBSERVATORY CAMBRIDGE MASS
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The relationship between flare rate and 8.6 mm brightness temperature was analyzed using data from 99 active regions present on the solar disk in 1969 and 1970. The rate of flaring appears to increase exponentially with 8.6 mm brightness temperature T sub b, for T sub b 9200 K. For higher temperatures, the rate of flaring appears to remain nearly constant, independent of T sub b. The resulting empirical relationship provides a quantitative means of estimating flare rates from an easily measured parameter, the 8.6 mm brightness temperature.