Physics
Scientific paper
Jun 1984
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984nsc..reptq..15h&link_type=abstract
In National Science Council Sci. Res. Abstr. in Republic of China, 1983 p 15 (SEE N84-35038 24-70)
Physics
Annual Variations, Diurnal Variations, Earth Ionosphere, Geomagnetism, Solar Cycles, Thickness, Ionospheric Storms, Magnetic Storms, Summer, Winter
Scientific paper
The characteristic variations of the ionospheric slab thickness observed at Lunping Observatory were analyzed. The slab thickness data obtained from March 1977 to February 1982 were used to analyze the diurnal, seasonal, solar cycle and geomagnetic variations. The shape of the diurnal variation shows a remarkable seasonal change. In summer, there are one maximum appearing in prenoon hours and a subsidiary maximum appearing in post sunset hours. However, in winter and equinoctial months, unusually large peak appears in pre-sunrise hours. The amplitude of pre-sunrise peak also depends on solar activity. It is larger in minmum solar activity than in high solar activity. The seasonal variations of slab thickness at different hours depend on the variations of solar cycle. Ionospheric slab thickness exhibits remarkable lunar daily variations which is largest in winter and smallest in summer. The storm time variation and disturbance daily variation of slab thickness were obtained by selecting 138 strong and weak geomagnetic storms. Superposed epoch method was also used to analyze the geomagnetic activity effect on the variation of slab thickness.
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