Comparison of hmF2 and midday bottomside electron density profile obtained from IRI and incoherent scatter measurements

Comparative study of electron density from incoherent scatter measurements at Arecibo with the IRI-95 model during solar maximum

“…Their studies have shown that the IRI model overestimates the bottomside thickness parameter during summer and equinox for both the solar minimum and maximum periods, while for winter, the IRI model shows a better agreement with the observations. Using IS radar measurements at Arecibo, during solar minimum period (1974±1977), similar results had been found by Pandey and Sethi (1996) using the new option of the IRI-90 model. In the present work we investigate how well the midday electron density distribution below the F2 peak, at Arecibo, for the period 1981, agrees with those generated by IRI-95 model.…”

Comparison between IRI-2001 predictions and observed measurements of hmF2 over three high latitude stations during different solar activity periods

“…Many researchers have compared the observed hmF2 values with the IRI model at equatorial and low latitudes during low and high solar activity periods Oyeyemi and Adewale, 2009;Wang et al, 2009;Zhang et al, 2007;Rios et al, 2007;Bertoni et al, 2006;Lee and Reinisch, 2006;Sethi et al, 2004;Abdu et al, 2004;Batista and Abdu, 2004;Pandey et al, 2003;Adeniyi et al, 2003;Pandey and Sethi, 1996;Batista et al, 1996;Bittencourt and Chryssafidis, 1994). They have reported that, in general, the IRI model predictions are good for low and high solar activity, except for post-sunset conditions for equatorial latitudes during high solar activity when the IRI does not reproduce the postsunset peak, which is an important feature of equatorial regions.…”

The bottomside parameters <i>B0</i>, <i>B1</i> obtained from incoherent scatter measurements during a solar maximum and their comparisons with the IRI-2001 model

“…In earlier studies, Mahajan et al (1995), using Arecibo measurements (a lowlatitude station) during solar minimum period (1974)(1975)(1976)(1977) showed that B0 values based on Gulyaeva's 1987 model were significantly larger, especially during daytime, for summer and equinox seasons, than those obtained from the measurements. Later, Pandey and Sethi (1996), using I.S. measurements during daytime from Arecibo, for the solar minimum period (1974)(1975)(1976)(1977), showed that the IRI-90 values of electron densities below the F2 peak at all the heights were larger during summer and equinox months.…”