Complete night of vertical-incidence ionosphere soundings covering frequency range from 50 kc/s to 25 Mc/s

Abstract

The readers of this Journal will be interested in seeing the Figure on the following page. It is the first presentation, to my knowledge, of a group of vertical-incidence ionosphere soundings covering the entire frequency range from below 100 kc/s to 25 Mc/s. Each record is a composite made by joining at the 2-Mc/s marker one record made by a standard Model C-4 recorder and a record made at approximately the same time by the experimental low-frequency recorder in use at the Sunset Field Station, about 15 miles distant. The series shown includes a complete night with sunset and sunrise at half-hour intervals. Enlargements were made to secure an approximate match of the virtual-height scales. As one can see, the low-frequency section is made with a linear frequency sweep, and the high-frequency part uses the logarithmic scale.