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abstract was submitted active regions aerial amplitude angular antenna anti-center Astroph beam beam-width brightness temperature bursts California Institute Carnegie Institution Cassiopeia cent chromosphere clouds collision cosmic Cygnus Department of Terrestrial detected diameter discrete sources eclipse curve energy equipment F. G. Smith Figure flares galactic latitude galaxy Hagen Harvard College Observatory Heeschen Hulst Institute of Technology Institution of Washington intensity interferometer interstellar ionospheric Khartoum km/sec limb brightening magnetic field Mc/sec McMath-Hulbert Observatory meter minutes of arc motions mount Naval Research Laboratory nebulosity neutral hydrogen noise observed obtained optical Orion oscillation output paraboloid peak brightness temperature plane polarization quiet sun radial brightness distribution radial velocity radiation radio astronomy radio emission radio frequencies radio sources radio star radio telescope radio waves receiver record reflector relativistic electrons rotation scintillation shown signal spectrum sun's atmosphere sunspot survey Terrestrial Magnetism tion U.S. Naval Research variation waveguide wavelength