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. – 126 с.

JANUARY 1977 У k m /i г 600 500 -400 -300 -4 -3 - 2 - 1 0 1 W-g. 2. Similar to figure 1 besides the change of the polarity of the IM P is shown. A0 30 20 10 JUNE 1975 p -Л -3 -2 -1 0 1 2 3 700 600 500 -400 -300 JULY 1975 A0 30 20Ц 10 г600 500 - A 0 0 -300 TT TT TT AA AA AA AA TAA AA i--- 1--- 1--- 1___ i___ i___ i___ i___ i a nother peculiarity. At these very m o m e n t a the tendency of "reversion" of the IMP polarity ap p e a r s ( A ~ T or T--A, A - f r o m the Sun, T - to the Sun). A and T are sampled f r o m the ground-based data /8/. Por instance, 112 "reversions" or polarity disturbances of the A — A T — A or T — ТА— I type of the investigated p eriods were observed during 1972-1984. The frequency of 77 per cent ia als o a n i n d i c a t i o n for the disturbing effect of the lunar ps e u d o - magnetosphe r e w h i c h has an effect on the variations of the magnetic field components measured fo r polar latitudes. Such three periods of sharp IMP polarity ch a n g e on the zero day (in Ja n u a r y 1977) and one day before the new M o o n (in June and in July 1975) are de m o n s t r a t e d in P i g . 2. I n Fig.3 three periods are shown w i t h more smooth T ТА— A inversions by the n e w M o o n period and i n the latter case (in July 1974) the lu n a r wake caused a I04