Position and Development of the Solar Flares of may 8 and 10, 1949.

This paper describes in detail the position and development of the solar flare of May 10, 1949. The underlying spots strongly influenced the pattern of flare material. Intensity-curves show that for most regions the increase in brightness was very sudden; the decline was slower and at such a rate as to suggest an exponential law. At maximum the brightest regions had four times the intensity of the undisturbed Ha disk. There was close correlation in the times of commencement and maximum of the flare and the accompanying radio-noise bursts on 480 Mc and 160 Mc. The flare of May 10 is compared to another flare that occurred in the same sunspot group on May 8