Abstract
The correlation analysis among A1-absorption data measured over Calcutta with solar 10.7cm radio wave flux and X-ray energy flux between 0-8 and 8-20Å bands has been made. The absorption data are found to correlate with 10.7cm flux values more strongly than with the X-ray energy fluxes, thereby clearly suggesting the importance of UV fluxes, having very good correlation with 10.7cm flux values, in D-region ionization.
The response (denoted by b in the equation B=a(1+b⋅Rz) (db); see the text in detail) of A1-absorption data for frequencies in the range from 2.2 to 5.5MHz towards sunspot number has been found to vary from 2.3×10-3 to 8.0×10-3. The increase in response can be attributed to an increase in the collision frequency in the deviative region with increasing solar activity.
