Lyman alpha and X-ray emissions during a small solar flare

Abstract

A rocket instrumented to measure Lyman alpha and X-rays was fired while a small flare was in progress on June 20, 1956. The rocket reached peak altitude about ten minutes after the flare was first seen visually. An unusually high X-ray flux was observed extending to a short wavelength limit of 3A. Although the flare was still visible in Hα, Lyman alpha was not appreciably different from normal.