Physics
Scientific paper
Mar 1967
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1967jatp...29..321y&link_type=abstract
Journal of Atmospheric and Terrestrial Physics, vol. 29, no. 3, pp. 321-326
Physics
2
Scientific paper
Total ionospheric electron content has been measured continuously since September 1964 by observing the Faraday rotation of a linearly-polarized wave received from the geostationary satellite Syncom III. Results of one year's observation at the University of Hawaii (20° N) are presented in the form of monthly mean curves. The seasonal trend observed is that the largest diurnal peaks in daytime content tend to occur during the equinoxes and the smallest diurnal peaks tend to occur during the solstices. The winter night-time content remains nearly constant at about 0.3 × 1017 electrons/m2. During the summer months, however, the night-time content is about twice that of winter nights, and the decay rate is greater. Although daytime variations in electron content resemble those of Npeak, significant differences are observed. These are illustrated by curves of slab thickness vs. time. In general, the slab thickness curves exhibit strong seasonal dependence. However, the late afternoon values are nearly the same throughout the year. In the winter, large pre-dawn and post-sunset peaks occur in the slab thickness curves. In the summer months a mid-morning peak is observed.
Roelofs Thomas H.
Yuen Pong C.
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