solar cycle and seasonal variations in f-region vertical drifts over kodaikanal, india

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ID: 223891
1995
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Abstract
Measurements of the changes in phase path of F-region reflections at normal incidence at Kodaikanal (77° 28'E, 10° 14'N, dip 3°N) from February 1991 to February 1993 are used to determine the variation of the equatorial evening F-region vertical drifts (V z) with season, solar and magnetic activity. It is found that on average, at Kodaikanal, the post-sunset peak in Vz(Vzp) is higher in equinox and local winter months than in local summer. The day-to-day variability in V zp is highest in summer and lowest in winter. This seasonal trend persists even on magnetically quiet days (Ap \leq14). Vzp is found to increase with 10.7 cm solar flux in all three seasons but tends to saturate for large flux values (>230 units) during local summer and winter months. Magnetic activity [represented by Ap as well as the time-weighted accumulations of a p and ap (τ)] does not seem to have any statistically significant effect on Vzp , except during equinoctial months of moderate solar activity, when Vzp decreases as magnetic activity increases.
Reference Key
ramesh1995annalessolar Use this key to autocite in the manuscript while using SciMatic Manuscript Manager or Thesis Manager
Authors ;K. B. Ramesh;J. H. Sastri
Journal journal of food measurement and characterization
Year 1995
DOI
10.1007/s00585-995-0633-7
URL
https://www.ann-geophys.net/13/633/1995/angeo-13-633-1995.pdf
Keywords
cosmic physics sciencephysicsgeophysics

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