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.

determined, from V to Kp. Some of the r esalts are shown in P i g . 4 for л =-1,0 (new Moon), the first and the seoond days. It is seen fr o m the figure that during the period of the new M o o n an d the first day after it R reaches its minimum a f t e r which on the second day ie quickly reestablished. The latter is showa more clearly in F i g . 5 ( where the results from all comput a tions are presented. The correlation coefficient for h i g h velooity fluxes of the solar w i n d ( V < 5 0 0 km/s) R„ and R„ for the normal solar wind ( V > 50 km/s) n n •re presented separately (see F i g . 5). Fr o m F i g . 5 we come to a general conclu sion that o n the days of the n e w M o o n a change of the correlation relation qt the solar w i n d v elocity to the E Kp geomagnetic index is observed wh i c h ia due to the perturbing effect of the lunar wa k e on the magnetosphere. A n interesting result concerning the influence of the IMF direction on this r elation is shown in Fi g . 6 where these days are selected fr o m the so indicated 9-day periods (Fig.4,5), where * =0 and 180°. The correlation coefficient R / ч*180°/=0.67 practically does not differ from the normal value of R on the days out of the n e w M o o n period (-4, +1). But R ( r «=0°)=0.79 exceeds to a large extent all the cases cons i dered up to no w wh i c h indicates that the interaction of the solar wind wi t h the Mo o n during the period by the n e w M o o n is maximized in terms of para l l e l i s m of the В magnetic induc tion of the IMF and the line Sun-Moon-Earth. Spectral a n a l y s i s . The statistical proof of the lunar wake effects on the m agnetosphere perturbations demands m e a s u rements of the solar wind velooity V before and after the M o o n together. The p r o b l e m is complex as all mea s u r e ments have be e n done in practice after the Moon. For this reason it is more suitable to p erform a spectral analysis of the perturbations, i.e. of the K p series w i t h a v i e w eventually to indicate a periodicity of 29.53 days (this number varies fr o m 29.25 to 29.83 days due to the elliptical orbit of the Moon). It should be pointed out that the possible lunar effect on the geomagnetic activity ha s been discussed in a number of works. This effect is supported b y /12-14/ while in /15-16/ the uncertainty a n d the insignificance of the sought effect are expressed. We should determine the le n g t h -N o f the series before discussing the methods by w h i c h we can define the frequency characteristics of the c onsider ed processes. This can be done b y means of confidence intervals. F o r this F i g . 5. Relationship bet w e e n R and the lunar phase. R u is the correlation coefficient for hi g h velocity fluxes of the solar wind V $.500 km/s, ft for the normal solar wind. I07