Движение на восток радиоавроры и петель свечения в утреннем секторе : [науч. докл. ПГИ-79-1] / Акад. наук СССР, Кол. фил. им. С. М. Кирова, Поляр. геофиз. ин-т ; М. В. Успенский, А. В. Кустов, Е. В. Пудовкина и др. – Препр. ПГИ-79-1. - Апатиты : [б. и.], 1979.

ra. It is possible that the bad visibility of that loop was caused by the breakup and disappearance of the preceding loop which happenned about 18:50 UT. At 01.20:00 UT the Loparskaya optical installations and Essoyla's radars observed a bright loop and radioaurora fil ling of that loop. The points confined the contour of the moving radioaurora. The azimuth size of the contour is defi ned by the wideness of the- antenna lobe and we believe ex ceeds the virtual dimension of the radioauroral region. That is why the centres of the contours are marked by shading. The shading shows the most probable location of the scatte ring regions. Kote that on the maps at 17:40, 18:50 and 20:00 UT can be seen the speed decrease of the eastward mo tion of the auroral loops and the radioaurora. Prom the ana lysis of the Loparskaya all-sky photographs it is clear that till 01.19:00 UT the first auroral loop was observed. That loop reached the Loparskaya zenith and disappeared. Before ОТ.20:00 UT new loop appeared which location was so*ewhat westward of the preceding one. At the moment when the radar antenna turned toward the north the second loop reached al ready the zenith in Loparskaya. Thus, the speed decrease of the movement of the optical forms and radioaurora were con nected with the appearance of the new. bright loop and with the fading of the first one just before that moment. New auroral loop and radioaurora began rapidly to move to the east. The radioaurora fills the inside part of the loop. The joint movement was observed at least during the four ro tational cycles of the antenna. During that time the loop and radioaurora passed approximately 500 km from the west to the east with the mean velocity 2.3 km/sec. At ОТ.23:00 UT that loop became also faint and faded. The last map pictured only the radioaurora because the Loparskaya optical installa tions did not observe the loop already. During the interval 20:00 — 23*40 UT the "loop** radioaurora was well observed also b y the 46 MHz radar in Essoyla. The, considerable diffe rence in the size and the location of the 46 MHz and 93 MHz echos were not revealed. 24