Computer Science
Scientific paper
Jan 1996
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996adspr..18..249y&link_type=abstract
Advances in Space Research, Volume 18, Issue 6, p. 249-258.
Computer Science
1
Scientific paper
We compare the equatorial anomaly in the Total Electron Content (TEC) we have observed in Taiwan with the International Reference Ionosphere (IRI-90) model. The data were obtained by receiving two coherent radio signals transmitted from the U.S. Navy Navigation Satellite System (NNSS). During low solar activity conditions (1985/1986), only minor discrepancies between the observed and the predicted TEC equatorial anomaly were seen. For high solar activity conditions (1989/1990), however, the anomaly is underestimated by the IRI in winter and equinox. The discrepancies between the observed and the predicted equatorial anomaly are smaller for the CCIR than the URSI set of coefficients. During high and medium solar activities, the strength of the anomaly is particularly pronounced in winter whereas there is no winter anomaly phenomenon found in the IRI model. A hysteresis phenomenon with respect to the solar cycle is observed but not predicted by any of the options in the IRI.
Kang Cheng
Yinn-Nien Huang
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