Astronomy and Astrophysics – Astrophysics
Scientific paper
Dec 1985
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985a%26a...153..145f&link_type=abstract
Astronomy and Astrophysics, Vol.153, NO. 2/DEC, P. 145, 1985
Astronomy and Astrophysics
Astrophysics
31
Scientific paper
The analysis of a receiver-antenna system designed for use on a spinning spacecraft to measure the properties of a distributed radio source with arbitrary polarization has been extended to include the effects of an arbitrary tilt in the axial antenna. These new results are used to analyze the response of the radio astronomy experiment on ISEE-3 and to design a data processing technique which is applied to solar radio data observed by that instrument. Several type III radio bursts have been processed and examples are given. When the ISEE-3 receiver is in the dipole configuration (normal mode), it is found that there is very little electrical tilt (<1.5 deg) of the axial antenna. However, when the receiver is operated in the monopole mode, using data from the - Z antenna only, an appreciable tilt of about 15 deg is measured. In both cases, no appreciable (>10%) circular polarization was measured, consistent with type III radio observations by the Voyager team. Data from an unusual solar radio event, as yet unclassified (possibly continuum type I or type IV emission), were analyzed by this new technique. For this event, which lasted for several days, it is found that it was over 50% circularly polarized at both 1 and 2 MHz, representing new observations of polarized solar radio emission at these low frequencies. With the utilization of these techniques, the ISEE-3 radio astronomy experiment becomes the first experiment on one spacecraft capable of accurate source angle determination in both azimuth and elevation. The precision of this method is better than one degree, and should permit detailed studies of source evolution.
Fainberg Joe
Hoang Sang
Manning Robert
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