Ionospheric Absorption on 2.4 MHz at Waltair

Abstract

Results of a preliminary investigation on the 2.4 MHz radio wave absorption in ionosphere using the Al technique are presented. It has been found that the diurnal variation parameter <i>n </i> (cos <img src='/image/spc_char/lembda.gif' border=0> index) has a wide range of values from 0.3 to 1.5 with a mean of 0.62 ±0.003 (p. e.). The cos <img src='/image/spc_char/lembda.gif' border=0> index <i>n </i> is found to have significant positive correlation with the Zurich sunspot number. The noon-time absorption values show large day-to-day variation and have a positive correlation with sunspot number. The seasonal variation of the monthly mean noon-time absorption indicates an increase in equinoctial months.