Полярные геомагнитные возмущения и связанные с ними явления : материалы международного симпозиума «Полярные геомагнитные явления», 25-31 мая 1986 г., Суздаль / Междунар. геодез. и геофиз. союз, междунар. ассоциация геомагнетизма и аэрономии, АН СССР, КНЦ, ПГИ. – Апатиты : [б. и.], 1989.

AL(A£,s„T, V.V^.W) Ee?,(5ni E* Ил 4>a,n.feV* nvVtM.Ur’ g)— <g)— ©■ ИШГт DR ®т, 6 k J)-------- Pig. 4. Dend r o g r a m s for the geomagnetoapheric storm 24-27.01.1974: dendrograms fo r the full period (a - precise, 6 - rough), precise dendro grams for the first stage of the m a i n phase - c, for its second atage - d, for recovery phaoe - e. d) summarizing e s t i m a t i o n of separate parameters (processes) rolo at the separate GMS phases an d in the whole picture of the phenomenon. Depending on peculiarities of D s t - v a r i a t i o n changes we have separated different GMS phases: bac k g r o u n d (B), initial phase (IPh), m a i n phase (MPh), recovex’y phaee (RPh), fuul period (IT) - 64 hours. The m a i n r esults of the investigations obtained on the base of proposed aequentional cluster a p proach are the following: 1. Different GM S consists of different phases excluded acc o r d i n g to Det-index variation peculiarities. Storm 1: B, IPh, MPh, R P h (see Fig.3)i Storm 2: B, IPh, MP h 1, MP h 2, RPh (see Pig. 4). This d i vision is not at all a formal one, it corresponds to differences i n the physical picture of the phenomenon in whole, w h i c h 1в c o n firmed by the fact that D s t - p arameter plays different role at different GMS phases. C o ncrete a n alysis of the cluster containing Dat of different GMS phases allows to describe Дп detail this role i n terms of prevailing inter influence u p o n other processes. Thus, fo r storm 1 (Pig* 3) a c luster has been picked out in the background phase [r>st , F E M + U T , v + v 2 ] (here sign "+”means stable an d close connection), w h i o h means prevailing Influence of