Comparison of the Radio Frequency Interference (RFI) in the Region of Solar Burst Type III Data at Selected CALLISTO Network

Abstract

Compact Astronomical Low-frequency, Low-cost Instrument for Spectroscopy in TransportableObservatories (CALLISTO) is a global network of spectrometer system with the purpose to observe the Sun's activities. There are 25 stations that are used for this purpose. Radio Frequency Interference (RFI) is a major obstacle when performing observation with CALLISTO. We have confirmed at least 2 stations out of 10 stations with a complete overview spectral (OVS) made available to us showed clear detection of these consistent types of RFI for each specific region. In Malaysia, these RFI are also clearly detected. The major RFI affecting CALLISTO within radio astronomical windows below 1 GHz are local electronic system specifically radio navigation (at 73.1 MHz and 75.2 MHz), broadcasting (at (i) 151 MHz, (ii) 151.8 MHz and 152 MHz), aeronautical navigation (at (i) 245.5 MHz, (ii) 248.7 MHz and (iii) 249 MHz and fixed mobile at (i) 605 MHz, (ii) 608.3 MHz, (iii) 612.2 MHz, (iv) 613.3 MHz). It is obviously showed that all sites within this region are free from interference at 320-330 MHz and is the best specific region to be considered for solar burst monitoring. We also investigate the effect of RFI on detection of solar burst. We have considered type III solar bursts on 9 th March 2012 in order to measure the percentage of RFI level during the solar burst. The RFI level is as low as 6.512 % to 80.769 % above solar burst detection.

Investigation of Drift Rate of Solar Radio Burst Type II due to Coronal Mass Ejections Phenomenon

“…CALLISTO spectrometer is a programmable receiver built to observe or detect solar radio burst that occur at each time and particular location [16]. The main applications of CALLISTO programme are observation of solar radio bursts and Radio Frequency Interference (RFI)-monitoring for astronomical science, education and others [17].…”

Investigation of Drift Rate of Solar Radio Burst Type II due to Coronal Mass Ejections Phenomenon

“…CALLISTO spectrometer is a programmable receiver built to observe or detect solar radio burst that occur at each time and particular location [16]. The main applications of CALLISTO programme are observation of solar radio bursts and Radio Frequency Interference (RFI)-monitoring for astronomical science, education and others [17].…”

Preliminary Analysis on the Solar Burst Type III and the Effect of the Magnetic Reconnection

“…This range has a very minimum interference at Blein, Switzerland site [53,54]. Selected the data from the 150 MHz till 900 MHz region seems this is the best range with a very minimum of Radio Frequency Interference (RFI) [54,55,56,57,58]. The next section will highlight the detailed analysis of solar flares in an X-ray and radio region to evaluate the distribution of high and low energy [41].…”