Some problems encountered in the process of estimation of calibration constantI0h0 have been discussed. The discrepancies observed in theI0h0 value determined by different methods were found to be mostly due to focussing. The difference observed between noontime values of absorption measured from different order echoes could be removed by a correction factor found after Piggot. But in certain cases the discrepancy in the reflection characteristics of single and multiple echoes were such that this correction factor did not give a consistent value. Such changes might be linked with sporadicE.
Volume 96, 2022
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