Visible light flux affecting the D layer

An earlier experimental result of potential importance to D ‐region chemistry and based on the effect of the earth's albedo is being reexamined and reconfirmed by presenting more detailed technical information on the airborne techniques employed. The interpretation of the observations, which consisted of radio soundings, suggests that the energy flux of visible light, distinct from the UV and X‐ray range, has a profound effect on the electron density of the D layer.