Physics
Scientific paper
Jun 1964
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1964jatp...26..641r&link_type=abstract
Journal of Atmospheric and Terrestrial Physics, vol. 26, no. 6, pp. 641-656
Physics
Scientific paper
Coefficients of lunar monthly, L1, and semi-monthly, L2, oscillations are calculated from each three-hourly mean values of f0F2 and hpF2 at Ahmedabad for the period March 1953-February, 1956. The lunar tides are found to be strong during daylight hours. The lunar tide in f0F2 has an amplitude of 0·34 Mc/s for midday hours but only 0·08 Mc/s when averaged over all hours of the solar day. The L1 oscillation shows random phase distribution and has much less amplitude than L2. During the course of one solar day, the amplitude and phase vector of L2 rotates through 360° in the clockwise direction on the lunar hour harmonic dial. There is a systematic change in the amplitude and phase of L2 oscillation in the course of a yearE The phase of L2 (f0F2) in May and June is around 03 hours, which is the same as that at equatorial stations. The amplitude of L2(f0F2) decreases with increasing sunspot number, but the phase remains the same. The amplitude of L2 (hpF2) increases and the phase advances by about 3 lunar hours in high sunspot years as compared to low sunspot years.
Alurkar Sadanand K.
Rastogi R. G.
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