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absorption mechanisms amplifier analog record antenna Arecibo Arecibo Observatory assumed bandwidth baseline brightness temperature broadening bunch calculated calibration signal cause CM CM CM coherence correction correlation Crab Nebula curved cutoff frequency discussed dispersion measure distance distribution function effect emission measure energy equation error experimental explain field lines Finally flux units frequency dependence given H.D. Jr Hewish high frequency cutoffs integrated flux interstellar medium intrinsic linearity Lorentz factor low frequency cutoffs luminosity magnetic field maser maser mechanisms MHz data neutron star noise optical parameters parsecs particles pointing polarization possible private communication pulsar observations pulsar pulses pulse broadening pulse shape pulsed power r-l CM radiation range Rankin Reichley relativistic right ascension rotation sampling scintillation shown in Figure signal-to-noise ratio spectral index standard source observations synchrotron self absorption telescope Terzian tion turnover variations velocity-of-light circle zenith angle zenith angle gain