Abstract
The short-term variability in A1 absorption measurements for Camden (34°S, 151°E) is caused by changes in the deviative component of absorption. These changes, in turn, are caused by enhanced electrondensity gradients (referred to here as ‘ledges’) near the reflection level. The ledges perturb the normal E-region electron density profile and introduce a bias (termed the ‘ledge effect’) into the absorption measurements. In the present experiment, the ledge effect was isolated by using the virtual reflection height information to interpret the A1 absorption measurements. During the period of this study (February 1980–January 1981), the ledge effect was observed to have both diurnal and seasonal variations. The effect was most noticeable in the afternoon around the equinoxes, but was essentially absent during the summer months.
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