On Pfister's theorem and its generalization

Details On Pfister's theorem and its generalization On Pfister's theorem and its generalization

Jul 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993jatp...55.1307b&link_type=abstract

Journal of Atmospheric and Terrestrial Physics (ISSN 0021-9169), vol. 55, no. 9, p. 1307-1310.

Physics

1

Doppler Effect, Ionospheric Propagation, Radio Transmission, Signal Reflection, Signal Transmission, Earth Ionosphere, Ground Stations, Magnetic Field Configurations

Scientific paper

The relation between angle of arrival and Doppler shift that has been called Pfister's theorem is shown to be a special case of a result that applies to ionospherically transmitted signals between fixed ground sites, whenever the ionosphere moves without change of shape. This general result does not require the existence of an effective mirror reflector or any special symmetry of the ionosphere, but depends only on the validity of ray theory. The formula obtained by Pfister (1971) is shown to apply, provided the ray returning from the ionosphere follows the same path as the incident ray.

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