80 MHz Measurements of Jupiter's Synchrotron Emission

Abstract

The spectrum of Jupiter's synchrotron emission was extended to lower frequencies by Gower (1968), who used a meridian transit interferometer to make measurements at 81·5 MHz. However, the elements of this interferometer had primary beams 1°·2 × 13° to half-voltage points and the correction to the observed interferometer pattern demanded by the presence of confusing sources within the primary beams was about three times the amplitude deduced for Jupiter. Consequently, it is important that an independent check be made of the measured value of 4·5 f.u.§