Abstract:
Using the ionospheric data measured with DPS-4 digisonde at Hainan station,we study the diurnal and seasonal variations of Δ
B2,the seasonal median values of
B2
best and parameter
R(ratio of
B2
best to
B2
NeQuick 2) in the ionosphere.The results show that there are some differences between
B2
best and
B2
NeQuick 2 in all seasons and
B2
NeQuick 2 is generally less than the values of
B2
bot at Hainan station. Meanwhile there is the same diurnal variation for
R in different years during moderate solar activity and the annual variation of
R is very small.Then,we make a revision for formula of NeQuick and results of revised formula show that the
B2
bot of NeQuick is better consistent with the observations.