Geometrical effects on radio pulsar profiles and spectra

Considering the geometry of the hollow-cone model of radio pulsar emission in detail, one is led to the conclusion that severalwell-knownobserved effectsmay be explained quite easily purely on geometrical terms. It can be shown e.g. that the appearance of outriders at high frequencies and a steepening of the whole spectrum (cut-off) must be expected for certain geometrical situations as well as variations in component spectra, e.g. a steepening of the central (core) component. These effects appear in addition to the presumably also existing physical variations with frequency.