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Abstract
The paper describes an analysis of SCL's observed at Delhi on long wave transmissions from Tashkent (164 kHz) and Alma Ata (182 kHz) with a view to corroborating or otherwise the results published by Letfus, Apostolov and Nestorov (1973, 1) on similar measurements carried out at Sofia utilising Allouis transmission on 164 kHz. It is shown that the Type A SCL (positive phase) is independent of seasons. Types B and C (negative phase) show some predominance in winter. The X-ray fluxes of higher energy in the spectral region 0.5–3Å appear to cause larger number of SCL's of negative phase. The qualitative explanation offered by the author (Mitra, 1970) for different types of SCL appears to be justified for Types B and C. However, more data are required to come to a definite conclusion. The nomenclature SCL suggested by the author to denote the phenomenon has been recommended for universal acceptance.