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Introduction 2 The Morphology of SpreadF
The Occurrence of SpreadF
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adiabatic lapse rate angle of arrival antennas appears Atmospheric Terrestrial Physics back scatter Booker Briggs Bureau of Standards charged particles correlation critical frequency cylinder Dagg difference diffuse diurnal double traces drift motion earth's magnetic field Eckersley effect electric field F layer F region F trace foF2 frequency type spread-F Geophys HIGH LATITUDE Huancayo ionograms ion density ionization iono ionosonde ionosphere irregularities latitude stations layer maximum magnetic field lines magnetic latitudes main trace Martyn McNicol and Webster mechanism MEGACYCLES meteor multiplet National Bureau observed occurrence of spread-F phase path plasma frequency polar probing frequency Proc propagation radiation radio star scintillations radio waves range type spread-F Rayleigh scatter Research 6k returning echo satellite traces Shimazaki 1959 signal Singleton 1957 spread condition spread echoes spread-F occurrence studies of spread-F suggest sunspot cycle surrounding medium tion turbulence TYPE SPREAD-F CONDITION Uyeda velocity virtual height virtual height versus wave length Webster and Bowman