Variation of NmF2 and hmF2 deduced from DPS-4 over Multan (Pakistan) and their comparisons with IRI-2007 & IRI-2012 during the deep solar minimum between 23rd and 24th solar cycles
Digisonde DPS-4 data of Multan (geog coord. 30.18(°) N, 71.48(°) E) is being reported for the first time. The variations in F2-layer peak electron density NmF2 and its height hmF2 have been studied during the deep solar minimum between 23rd and 24th solar cycles along their comparisons with International Reference Ionosphere, IRI-2007 & IRI-2012 predication. The observation results show that the NmF2 values are greater and smaller during daytime and nighttime, respectively. The hmF2 observations show sunrise peaks along with some prominent pre-sunrise peaks in some months. Seasonal variations show that the daytime NmF2 values are greater in the equinox and summer months, while the daytime hmF2 values are slightly greater in the equinox and winter months. For the comparison of observations with IRI-2007 and IRI-2012, the observed hmF2 values are closer to IRI-2007 than to IRI-2012. The NmF2 values of URSI map of IRI-2012 agree well with the observations in equinox. The IRI-2007 agrees better with the NmF2 observations for winter and summer than IRI-2012, whereas IRI-2012 is closer to the observations for equinox months. The variation in the observed parameters exhibits that the ionosphere over Multan is showing the properties of both equatorial and mid-latitude due to the location of station.
40th COSPAR Scientific Assembly
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