Validation of B0 and B1 in the IRI 2001 model at low solar activity for Ilorin an equatorial station

Details Validation of B0 and B1 in the IRI 2001 model at low solar activity for Ilorin an equatorial station Validation of B0 and B1 in the IRI 2001 model at low solar activity for Ilorin an equatorial station

Aug 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008adspr..42..691a&link_type=abstract

Advances in Space Research, Volume 42, Issue 4, p. 691-694.

Physics

3

Scientific paper

A new set of data obtained at low solar activity from Ilorin, Nigeria (geog. latitude 8.5°N, geog longitude, 4.6°E, dip 4.1°S) is used to validate the IRI 2001 model at low solar activity. The results show in general a good agreement between model and observed B0 at night but an over estimation during daytime. The overestimation is greatest during the morning period (0600LT 1000LT). The model prediction for B1 is fairly good at night and during the day. A dependence of B0 on solar zenith angle χ is observed during the daytime. A formulation of the form B0 = A[cos(χ)n] is therefore proposed. Values of the constants n and A were determined for the period of low solar activity for this station.

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