Physics
Scientific paper
Feb 1998
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998jastp..60..381a&link_type=abstract
Journal of Atmospheric and Solar-Terrestrial Physics, Volume 60, Issue 3, p. 381-385.
Physics
12
Scientific paper
Parameters B0 and B1 are compared with those of the International Reference Ionosphere (IRI), using the Gulyaeva option. The data used are those of Ouagadougou, Burkina Faso, (latitude 12.4°N, longitude 1.5°W, dip 5.9°N) for 1994, a year of low solar activity. Night-time and early daytime B0 values agree well with those of the IRI. The average value of B0 for night-time is 73. Major differences occur during the daytime (09:00-18:00 LT) and these are dependent on season. Daytime B0 shows a diurnal variation which depends on the solar zenith angle χ. The cos(χ) exponents were found to be 0.45, 0.67, 0.56, and 0.75 for winter (January), spring (April), summer (July), and autumn (October), respectively. For B1, IRI assumes a constant value of 3 most of the time and this appears to overestimate the experimental B1 values. The experimental values of B1 are fairly constant during daytime hours (08:00-15:00 LT), with an average value of 1.7. They are between 2.6 to 3.8 during the evening and night-time period up to 07:00 h.
Adeniyi J. O.
Radicella Sandro M.
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