Some properties of the ionosphere at low radio frequencies
Low-frequency ionospheric polarization, relative virtual height, and relative reflection coefficient measurements were made at near vertical incidence during October 1952. These measurements were made at a frequency of 50 kc/s. A new, continuous-wave, phase-measuring technique was employed. The ess...
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https://thesis.library.caltech.edu/158/1/MacMillan_rs_1954.pdfMacmillan, Robert Smith (1954) Some properties of the ionosphere at low radio frequencies. Dissertation (Ph.D.), California Institute of Technology. doi:10.7907/ETPM-E198. https://resolver.caltech.edu/CaltechETD:etd-01142004-090820 <https://resolver.caltech.edu/CaltechETD:etd-01142004-090820>