The paper presents isophotal contour maps of the solar flare of April 12,1950, at various stages of development, and a plot of integrated intensity of the flare as a function of time. Our measurements indicate that at flare maximum the earth received a radiation of solar Ha energy/sec which exceeded "quiet' `-sun Ha radiation by nearly 2 X 1(V8 ergs/sec. The estimated total energy in Ha reaching the earth from the sun between the recognized start of the flare and its end exceeded that from the quiet sun for a corresponding time interval by approximately 9 X 1021 ergs.
No takes yet. Share an insight, caveat, or question.
Billings et al. (1953) studied this question.