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Ann. Geophys., 20, 817-822, 2002
www.ann-geophys.net/20/817/2002/
© European Geosciences Union 2002
The bottomside parameters B0, B1 obtained from incoherent scatter measurements during a solar maximum and their comparisons with the IRI-2001 model
N. K. Sethi and K. K. Mahajan
Radio and Atmospheric Sciences Division, National Physical Laboratory, Dr. K. S. Krishnan Road, New Delhi – 110 012, India
Correspondence to: N. K. Sethi (nksethi@csnpl.ren.nic.in)
Abstract. High resolution electron
density profiles (Ne) measured with the Arecibo (18.4 N, 66.7 W),
Incoherent Scatter radar (I. S.) are used to obtain the bottomside shape
parameters B0, B1 for a solar maximum period (1989–90). Median
values of these parameters are compared with those obtained from the IRI-2001
model. It is observed that during summer, the IRI values agree fairly well with
the Arecibo values, though the numbers are somewhat larger during the daytime.
Discrepancies occur during winter and equinox, when the IRI underestimates B0
for the local times from about 12:00 LT to about 20:00 LT. Furthermore, the IRI
model tends to generally overestimate B1 at all local times. At Arecibo,
B0 increases by about 50%, and B1 decreases by about 30% from
solar minimum to solar maximum.
Key words. Ionosphere (equational
ionosphere; modeling and forecasting)
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