Proton Flux during the Great Aurora of 3-4 September 1959

Science  05 Feb 1960:
Vol. 131, Issue 3397, pp. 353-354
DOI: 10.1126/science.131.3397.353


Photoelectric measutements of the Hβ intensity show that it continued to increase after a corona formed, and reached a maximum as the corona broke up into rays, decreasing rapidly to nearly zero within the next 10 minutes. The maximum flux of protons incident on the earth during the aurora, deduced from these measures, was at least 1.4 x 108 auroral protons per square centimeter, per second.