Аскаплоты полярных сияний за 1985-1986 гг. / Рос. акад. наук, Кол. науч. центр, Поляр. геофиз. ин-т. - Апатиты : КНЦ РАН, 1997. - 92 с.

(UT). The local geomagnetic midnight is marked with a circle under the ascaplots. Three upper lines show aurora location in the sky. The upper black square demonstrates that within a given half-an-hour interval the aurora was observed within the scale of zenith angles from 60 N to 80 N. The second black square corresponds to aurora in the zenith (from 60 N to 60 S) and the third black square marks aurora in the South (from 60 S to 80 S). Occurrence of auroras in the corresponding part of the sky was marked when an aurora was observed during one minute in a given time interval. Suppose the height of the lower edge of aurorae is about 100 km we get all three angle intervals at about 3 degrees of corrected geomagnetic latitude. Presence of stars on the films makes it possible to guess meteorological conditions in every latitude interval. According to /1 ,2/ the dot in the middle of the square shows weak clouds or partial clouds in the given part of the sky. The vertical line denoted ten-tenths cloud. The tick inside the square of the third line points to bad quality of the ascafilm caused by some technical reasons. The horizontal line denotes absence of observations. To mark moon lighting the horizontal line was used over the ascaplot. Two bottom lines of squares inform about auroral activity. The first black squares mean index 2 auroral activity and the two black bottom squares refer to that of index 3 aurorae. It should be noted that the activity in ascaplots does not entirely coincide with brightness of forms. The index of activity also includes such parameters as the type of the form and its life­ time within the given half-an-hour interval. Auroral activity has been estimated only for the zenith region. Series of auroral activity published in /7 / were taken as a basis. They are comiected with the peculiarities of substorm development and, to some extend, characterise intensity of the substorm. 1 Д fi В- у \n vii ѵю у ? ji хй gj/ «<«- Fig. / Exampl o f the ascaplot. Figure 1 presents an example o f ascaplots. The numerals 1-XV show various possible situations. In the given example the camera did not work until 13.30 UT. I- aurorae was absent, partial clouds was observed in the north and in the zerrith. II- aurorae were absent, complete clouds was observed in the north and in the zenith, partial clouds in the South. III- and IV -time intervals of ten-tenth cloud. V- partial clouds at the zenith, clear sky in the north. VI- aurorae in the north, no clouds in the zenith and partial clouds in the south. VII- clear sky, aurorae were observed in the north and the zenith. VIII- clear sky, aurorae were seen only in the north, local geomagnetic midnight. IX- aurorae again shifted to the zenith and their activity gained index 2 , no clouds in the south. II