Studies on Solar Radio Signal Variations at Frequencies in the VLF and VHF Bands

Abstract

Depending on the energy release and the transfer processes, the solar radio bursts may cover a wide bandwidth and may have fine frequency structure. Impulsive and gradual energy release take place from the varying activity centers of the Sun. Solar wind and geomagnetic storm are responsible for affecting fair weather current. All the noted characteristic changes have been analyzed in the paper. Using wind-proof log periodic dipole array developed by our team we have observed constantly varying signal voltages against time. The spectrum analyzer has been used to get solar radio bursts from 50 MHz to 300 MHz. Disturbances to the solar wind owing to a solar flare trigger a geomagnetic storm. Signal variation data caused by solar bursts have been considered with reference to the geomagnetic conditions, for different values of $\text{K}_{\text{p}}$ and $\text{a}_{\text{p}}$ indices in particular. A correlation between solar radio burst and geomagnetic conditions has established and the results are interpreted from the consideration of the physical properties.