Abstract
Measurements made from the SR-1 satellite confirm the hypothesis that solar X rays are the cause of flare SID events, and that variations in solar Lyman α are not geophysically significant. Results also indicate that active prominence regions, bright surges on the limb, and certain limb flares have the same X-ray characteristics as major disk flares. SID phenomena occur when the solar X-ray flux below 8 A exceeds 2×10−3 erg cm−2 sec−1 as measured above the earth's atmosphere. Solar X-ray fluxes can change significantly in a time scale of the order of 1 minute. Long-duration X-ray events of moderate intensity can accompany rising limb prominences.
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