DocumentCode :
1227115
Title :
Ionospheric Virtual Height Measurements at 100 Kilocycles
Author :
Helliwell, Robert A.
Author_Institution :
Stanford University, Stanford, Calif.
Volume :
37
Issue :
8
fYear :
1949
Firstpage :
887
Lastpage :
894
Abstract :
A simple high-power ionosphere sounding equipment for use at low frequencies is described. Its application to the measurement of virtual height at vertical incidence at a carrier frequency of 100 kc is reported. Results of nearly a year of intermittent night-time measurements showed a remarkably large variation in virtual height which ranged from about 84 km to as high as 106 km. Some evidence was found to indicate that frequently at night the reflecting region consists of clouds or patches of ionization, rather than the more nearly uniform ionization characteristic of the regular layers at high frequencies. A rotation of the polarization of the reflected signal with respect to that of the transmitted signal was observed.
Keywords :
Arm; Bridge circuits; Capacitance; Clouds; Frequency measurement; Impedance; Ionization; Ionosphere; Particle measurements; Reflection;
fLanguage :
English
Journal_Title :
Proceedings of the IRE
Publisher :
ieee
ISSN :
0096-8390
Type :
jour
DOI :
10.1109/JRPROC.1949.229690
Filename :
1698107
Link To Document :
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