Mushtaq, M.Afridi, F.A.K.Alam, S.N.Fatima, H.2019-02-072019-02-072018-12Journal of the National Science Foundation of Sri Lanka, 46(4):p.527-538https://dl.nsf.gov.lk/handle/1/24316f0F2Geomagnetic Ap indexIonosphereMidlatitudeSunspotModelling the effects of solar activity on the ionospheric F2 critical frequency over WakkanaiArticle