Radio Interference Measurement For Optimum Solar Radio Observationusing Callisto Spectrometer At Sumedang Indonesia

Callisto (Compound Astronomical Low-cost Low-frequency Instrument for Spectroscopy and Transportable Observatory) spectrometer has been installed at Sumedang Indonesia since July 2014. A high gain 21 elements log periodic antenna and pre-amplifier are equipped to the Callisto. As a basis for the operation of the Callisto spectrometer to observe emission of the sun, measurement of radio interference has been conducted at Sumedang station. This measurement was made to determine the selected appropriate frequency selection for solar radio observation using Callisto. The result of radiointerference measurement is presented in this paper, as well as analysis of the source of the interferences. Although the Sumedang station is not an ideal location for solar radio observations due to the interferences, several possibilities based on the analysis are determined, i.e. frequency below 87 MHz, frequency between 160-430 MHz, and frequency above 780 MHz can be used for solar radio observations. Finally, by applying the frequency selection to Callisto frequency configuration, a 5th November 2014 solar radio burst as a result of solar radio observation using Callisto at Sumedang Indonesia was shown.Hal. 77-8