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.

Discussion. The observations of the eastward motion of the hokllke radioaurora were discussed by Tsunoda and Fremow, 1975,1976. But the authors have not discussed the evidences that the eastward movement of radioaurora may accompany the optical forms. At the same time such phenomena were known for the evening sector and the westward movement. One example demonstrating the possibility of joint movement of the auro ral forms and radioaurora to the east was shown and discus sed by Starkov et al.,1979. In this example as well as for the westward motion the velocities of the joint movement usually exceed the acoustic velocity (0.3 - 0.5 km/sec). The joint eastward motions of radiaaurcra and auroral loops dis cussed in this paper have sup rsonic velocity als'». The first loop was moving with the average velocity 1.7 km/sec, the second one — 2.3 km/sec. In their subsequent eastward move ment the loops and the accompanied radioaurora passed about the 25° longitude, sector about 2 hours of local time, during 12 min. It is interesting that the observations on the three frequencies (140, 93» 46 MHz) have not demonstrated the prin ciple distinctions of such eastward movement of auroral loops and radioaurora. The discussed rapid movements of the optical forms and ra— dioaurora fall on the preceding phase and on the onset of a morning microsubstorm. The principle possibility of the lon gitudinal localization of the local centre of geomagnetic activity as the source of the microsubstorm was discussed by Sergeev,1974. The observed morning microsubstorm was unusual in the development. The onset of the 3ubstorm displayed in arising and flashing of the eastward travelling loop. Seve ral minutes after the loop flashing the breakup took Its usual form when old arcs flashed and new arcs, the arising of a background luminosity and an equatorward and polewa^ auroral movements appeared. The discussed microsubstorm was preceded by the prebreakup fading of the auroral activity. Less distinct, but existing without any doubt and noticeable the prebreakup fading also in the ra>iiof-uxora seen. The distinct prebreakup fading of the auroral activity la an additional confirmation that oux microsubstorm developed in 25