Электродинамические процессы в высоких широтах: материалы междунарордного симпозиума «Полярные геомагнитные явления», 25-31 мая 1986 г., Суздаль, СССР / Междунар. геодез. и геофиз. союз, Междунар. ассоц. геомагнетизма и аэрономии ; Акад. наук СССР, Кол. фил. им. С. М. Кирова, Поляр. геофиз. ин-т ; [редкол.: О. М. Распопов (отв. ред.). и др.]. - Апатиты : Кольский филиал АН СССР, 1988. - 156 с.
Number ofnonc/etectaSiCity storm disturbance difference(&Dst) Figure 2. The histograms of occurrence аз a function of Dat difference illustrate a step-rise appearance of the ULF geoelectric pulsations (with period T b el o w 40 seconds) at positive values of A Dst. The hatched area indicates the frequency of appearance (positive N) and frequency of n o n d etectability (negative N) f or the time interval 0- 1 8 UT. An indifferent behaviour of the cases of n o n -d e t ectability as a function of A Dst is shown. Figure 3. Histograms showing a relat i o n of the am pl i tude changes of the east-west (E-W) components of the middle- latitude pulsations w i t h respect to the storm disturbance differ ence ( Л Dst). A linear r e gr e s sion yields: AE W H 3 . 3 4 + 0 . 2 4 D s t , and an expotenxlal curve fit gives: A g _w = 3 . 2 3 e x p ( 0 . 0 5ЛDst). Relative N-S j I amplitude c £ l T f ± t P - 4 0 4 3 Dst (storm d istu riance) difference Figure 4. Histograms showing no rela t i on of the amp litude variations of the north- south (И-S) components of the geoelectric pulsations at middle latitude wi t h respect to the changes in Dst. L inear r e gr e s sion yields: Ajj_ 2 « 1 .64+0.02 л Dst, R e la tiv e ( E-W ampcituae +6 ~ 8 ~ 4 0 4 Dst (storm disturbance) difference I04
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