Study of Radial Differential Coronal Rotation using Solar Radio flux for period (1980 1986)

Spatial and temporal variation of inner and outer corona of solar rotation are interesting topics to explore which is one of the root causes of most of its activities and impacts on space weather of the earth. The research presented here investigates radio emission released from various layers of the solar corona during the years 1980-1986 (Half Schwabe Cycle). The rotation of the sun can be studied through various methods such as tracking of tracers, spectroscopic and flux modulation. The flux modulation is used in our study to explore dynamics in solar rotation. Annual time series of radio emission data at frequencies 430 and 810 MHz recorded at Jagiellonian University Radio Astronomical observatory, Cracow, Poland; at 1415 and 2695 MHz recorded at Sagamore Hill Radio Observatory Massachusetts, USA and 2800 MHz recorded at Dominion Radio Astrophysical Observatory, Pentincton, Canada are used in our study. Any periodic component, if embedded in such time series, could not be found directly, hence Lomb Scargle Periodogram (LSP), a suitable statical method which can deal with such time series, having permissible data gaps, is used here to find periodic components from available time series. The rotation period so obtained is studied against emission frequency emanating from different heights in the solar coronal atmosphere.