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.

men tio n that at about 0650 U T the equatorward boundary of red luminosity separates the discrete forms moving polewards inside the region from the rayed arcs moving equatorwards at lower latitudes. Figure 8 presents the scaimograms showing the typical characteristics of the luminosity across- the auroral zone in various geophysical conditions. The 0605 an d 0640 UT scaimograms were obtained w h e n a broad region of diffuse luminosity wa s observed throughout the sky. The 557.7 run emission intensity increased monotonously fr o m the poleward boundary of the diffuse luminosity region to its equatorward boundary and was about 2 time as high as the 630.0 nm intensity at all zenith angles. The 0 7 1 5 * 0 7 2 0 and 0730 UT scaimograms were obtained wh e n the rayed arcs m oving polewards were observed at the station zenith, while the diffuse lu m i n osity w a s observed equatorwards fr o m the station. The comparison of the scaimograms shows that the r e d line intensity reaches its m aximum values polewards f r o m the station zenith. The green line intensity in the region remains at a sufficiently l o w and approximately constant level. The 557.7 n m emission intensity increases abruptly equatorwards fr o m the region of the highest re d luminosity intensity. Thus the regions of luminosity i n the red and green lines of atomic oxygen are distinctly separated in latitude, there by indicating that the precipitation regions of auroral electrons of diffi cult energies are also separated i n latitude. The right-hand side of Fig.8 presents the scannograms obtained from 0808 to 0812 UT. The 0810 UT acannogram shows an abrupt increase i n the 557.7 n m emission intensity. A c c ording to the photometric data, the intensif ication lasted for about 40 s. The analysis of the data has shown that the short-time enhancements of the 557,7 n m luminosity exhibit a recurrence from 4 to 11 min. The auroral events observed on that day are described in more detail b y Vorobjev and Turyansky (1983). The December 30. 1984 c a s e . The auroral events observed on that day are analyzed on the basis of the observation data from Heiss Island w h i c h are partly presented i n Fi g . 9. The upper part of the figure shows the dynamics of auroras during the 0400-1000 UT interval. The dashed lines there show the R? - А 6 Э 00 Л - гЛ ^ѵ \>/ I< k « г о - ■ А5577X " ^ O o A s ^ jt 20- 1 h m 106 40 г о - Г— ^ /07 15 ■ J \ го- Г—*■*»' Л ѵ п г т т т і w f ГГ г rf-rn-1 ) h m 4.0 2.0- 2Л- N 20 - 2 . 0 - r ~ A ^ i 10 50* 0* 5<f S N 50" o« ‘s o 'S 12 Figure 8. The January 21,1982 scannograms in the 630.0 and 557.7 nm emissions The universal time is indicated on the right. I32