Correction of B2bot for NeQuick During Low Solar Activity at Hainan Station

This work is a continuation of the previous article and it focuses on low solar activity and modeling effort. NeQuick model uses Epstein layer formalism to model each part of the profile. We study the diurnal and seasonal variations of B2(bot), Delta B2 (B2(best) - B2(NeQuick2)) and R (B2(best)/B2(NeQuick) (2)) at Hainan station during low solar activity. The results show it is possible to improve the B2(bot) parameter of the NeQuick model at that region during low solar activity. Then, we use a function f(t) with LT in different seasons to correct the B2(bot) t formula of NeQuick 2. The correction shows that (1) By the correction formula, the B2(bot), of NeQuick is improved. The maximum standard deviation is improved for 9 km. (2) The correction formula is more effective in summer than in equinox and winter and performs better during early morning hours than during the rest of the day. Crown copyright (C) 2012 Published by Elsevier Ltd. on behalf of COSPAR. All rights reserved.