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amplitude antenna approximately Atmospheric Terrest attenuation auroral collision component critical frequencies CRPL curves cycle decrease dipole distance disturbance diurnal variation earth echo effect electromagnetic electron density ellipses engineering equations extraordinary waves F region factor fading forward scatter Fresnel zone geomagnetic Geophys given groundwave height of reflection high latitudes incidence ionization ionogram ionosonde ionospheric absorption J. A. Ratcliffe kc/s low frequencies magnetic field magneto-ionic mathematical maximum frequency Mc/s measurements medium meteor method mode motion noise normal oblique observed obtained occur ordinary wave Paperbound path loss phase change phase velocity Phys physics plane problems Proc quency radiation radio propagation radio waves radius range ray path receiver reference reflection coefficient refractive index region relatively shown in figure signal strength skywave solar flare spread F storm sunspot number theory tion trail transmission transmitter vector vertical virtual height wavelength zone