^aDepartment of Physics, A.P.S. University, Rewa (M.P.) 486003 (INDIA)
^bDepartment of Physics and Comp. Science, Govt. T.R.S. College, Rewa (M.P.) 486001 (INDIA)
E-mail: praveentrs@gmail.com

The average characteristics of diurnal variation have been found to vary with solar cycle different phases, where the variation is much larger at higher energies. A number of investigators have reported short as well as long term characteristics of the daily variation, To observe the impact of solar cycle variations (22 and 23) on high as well as low amplitude wave train events (LDW and HDW), the events were classified on the basis of different phases of solar cycles, i.e. the minimum solar activity time period, the maximum solar activity time period, the declining phase of solar cycle. It was observed that low amplitude wave train events are dominant in every phase of solar cycle except in the time period of maximum solar activity time period, where the high amplitude diurnal wave train events are dominant. In the minimum solar activity time period only low amplitude wave train events are observed in both solar cycles.