Results of foF2 and Ne-h profiles at low latitude using recent digital ionosonde observations and their comparison with IRI-2000

Details Results of foF2 and Ne-h profiles at low latitude using recent digital ionosonde observations and their comparison with IRI-2000 Results of foF2 and Ne-h profiles at low latitude using recent digital ionosonde observations and their comparison with IRI-2000

Apr 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003jastp..65..749s&link_type=abstract

Journal of Atmospheric and Solar-Terrestrial Physics, Volume 65, Issue 6, p. 749-755.

Physics

5

Scientific paper

Using digital ionosonde observations at low-latitude station, Delhi (28.6 N, 77.2 E, mag. dip 42.4 N), the diurnal and seasonal variations of the critical frequency of F2 layer (foF2) are analyzed from August 2000 to July 2001 during a high solar activity period. Also, noontime bottomside electron density (Ne-h) profiles, below the F2-peak, are derived from ionogram, using the POLAN (Report UAG-93, WDC-A, for Solar Terrestrial Physics, Boulder, Co.) program during the same period, and these profiles are then normalized to the peak height and density (hmF2, NmF2) of the F2-region. These observations are used to assess the predictability of the International Reference Ionosphere, IRI-2000 model (Radio Sc. 36(2) (2001) 261). Results show in general, a large variability, (/1σ, /σ is standard deviation), in foF2 during nighttime than daytime during winter and equinox, the variability of foF2 about the mean is about /+/-25% by night and /+/-15% by day. The IRI model shows a fairly good agreement with foF2 observations during daytime, however during nighttime, the discrepancies between the two exist. Comparative studies of the normalized observed profiles with those obtained with the IRI model (Bilitza, 2001) using both the options namely: Gulyaeva's (Adv. Space Res. 7 (1987) 39) model and /B0-Table (Adv. Space Res. 25(1) (2000) 89), show that during all the seasons, in general, the /B0-Tab option, reveals a better agreement with the observations, while the IRI model using Gulyaeva's option, overestimates the electron density distribution during summer and equinox, however, during winter, the model is close to the observations. The comparisons of average profile shape parameters /(B0,B1) derived from noontime observed profiles, with those obtained, using /B0-Tab option, in the IRI model, show a good agreement during all the seasons. However, /B0, /B1 obtained, using Gulyaeva's option in the IRI model, show a disagreement with the derived /B0, /B1 values during all the seasons, except during winter, for /B0 parameter.

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