Physics
Scientific paper
Sep 1992
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992jatp...54.1201k&link_type=abstract
Journal of Atmospheric and Terrestrial Physics (ISSN 0021-9169), vol. 54, no. 9, Sept. 1992, p. 1201-1205.
Physics
18
F 2 Region, Geopotential Height, Solar Cycles, Sunspots, Annual Variations, Geomagnetism, Hysteresis, Long Term Effects, Regression Analysis
Scientific paper
For solar cycle 19 (1954-1964), the 12 monthly mean values of noon-time f0F2 at Ahmedabad (23 deg N, 73 deg E) show a large hysteresis effect when plotted against sunspot number or against geomagnetic Ap. However, a multiple regression analysis for the dependence of f0F2 on solar 2800 MHz flux and geomagnetic Ap, simultaneously, shows a better matching. Thus, long-term predictions need to take into account not just sunspot number but some solar index and geomagnetic index as two key parameters, simultaneously.
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