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Title: vlf Sudden Phase Anomalies during Flares of Aug. 1972
Authors: Dubey, R C
Gupta, S K
Pande, M C
Issue Date: Mar-1977
Publisher: NISCAIR-CSIR, India
Abstract: Sudden phase anomalies during solar flares of 2 and 4 Aug. 1972 were observed in NPG 18'6 kHz signals over a long vlf propagation path between Jim Creek, Washington and Naini Tal. This and the other simultaneous phase anomaly data by Naito et al. (Solar geophys. Data, UAG, 28 (1973), 584] at a frequency of 22·3 kHz over a propagation path between Uji, Kyoto University and NWC, Australia, have been utilized to study the enhanced D-Iayer ionization and lowering of reflection heights during the flares. The values Of ae eff= 5·5 X 10-5 cm3 sec-1 and 2·91 x 10-3 cm3 sec-1 for the 2 and 4 Aug. 1912 flares are higher than the values estimated by Chakrabarty D K and Mitra A P (Indian J. Radio Space Phys., 3 (1974). 76] for strong flares.
Page(s): 67-68
ISSN: 0975-105X (Online); 0367-8393 (Print)
Appears in Collections:IJRSP Vol.06(1) [March 1977]

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