Spectrum of the coherent radio emission from pulsars

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Coherent Electromagnetic Radiation, Magnetospheres, Pulsars, Radio Emission, Stellar Radiation, Stellar Spectra, Current Density, Electric Current, Frequency Distribution, Micropulsations, Stellar Rotation, Time Dependence

Scientific paper

The power law form of pulsar spectra is derived based on observational data on micropulses and the quasi-steady time dependence of the magnetosphere. The formalism takes the coherent nature of the emission into account without reference to any specific emission mechanism, since it is based on a macroscopic description of an arbitrary distribution of the electric current. The values of -1, -5/3, -3 or -11/3 that can be assumed by the spectral index, together with the high-frequency break and the low-frequency turnover of the spectrum, are features of the radiation from a randomly fluctuating electric current, whose distribution on the large scale has a rotating pattern. Correlations between these features and others of a quasi-steady magnetosphere are discussed.

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