AURORAL RADIATION AT 500 Mc.

Abstract

An observation of radio noise emissions at 500 Mc. from a type A red auroral display which occurred on October 21–22, 1957, is reported. The circumstances surrounding this phenomenon are considered, and the unusual display is linked to a large flare on the sun some 30 hours earlier. It is concluded that an unusually large particle flux for the ejected solar matter would produce sufficient ionization in local regions of the ionosphere so that auroral radio emissions would be possible.