Solar Limb Flare and Associated Radio Fade-out, April 15, 1947

Abstract

In the report of the Astronomer Royal to the Board of Visitors of the Royal Observatory, Greenwich (June 7, 1947), reference is made to the occurrence of a severe magnetic disturbance on April 17–18, and of a major radio fade-out at 14.57 hr. u.t. on April 15, almost 46 hours prior to the commencement of the magnetic storm. No related solar flare had been identified.