The state and dynamics of the earth’s ionosphere is completely controlled by the solar radiations. The amount of solar radiation incident on the ionosphere varies considerably with the solar activity, so does the ionospheric variability. In this paper we investigate the influences of solar flares on the ionospheric variability, since during solar flares huge amounts of radiation fluxes are released from the sun. To investigate the effect of solar flares on the ionosphere we consider the solar flares that were observed during 1998-2011. We have taken the three latitude station one each in mid, low and high latitude region. The correlative study of fluxes (X-ray flux in the 0.1 – 0.8 nm band and solar EUV flux in the 24 – 34 nm band) was carried out with GPS derived Total Electron Content (TEC) at all the three latitude station. From our study we found that peak values and peak enhancements of the radiation fluxes correlate well with the peak values and peak enhancements of TEC. However the correlation between peak enhancements of fluxes and TEC are much stronger than the correlation between peak values themselves. We then adjusted the solar radiation fluxes to the CMD, where CMD is Central Meridian Distance and takes care of flare location on the solar disc, and then investigated the correlation of CMD adjusted fluxes with the TEC. We found that the correlation between fluxes and TEC is extraordinarily improved as the fluxes are adjusted to CMD.