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Rayed midlatitude aurora in 2001 and 2003
Observations of midlatitude aurora in 2001 and 2003 at the observatory of Kyiv National Shevchenko University near Kyiv (Lysniky, 50.3N, 30.5E) were carried out. Geomagnetic location of the point of observation corresponds to geomagnetic shell of L = 2.1 at ionospheric heights and such events were observed in this region very rarely. Rayed structure of aurora appeared in both cases. During visual observations on 6 November 2001 the positions of the lower edge of auroral rays were marked on the star map. With the assumption of the lower edge height of 200 km, the estimations of distance (about 500 km), geomagnetic shell (L = 2.6) and dimensions of the rays (width of 5-30 km and length of about 150 km) are obtained. Color photographic images on 29 October 2003 show rayed structure in the red region of aurora (630 nm) and diffuse glow in the green one (557.7 nm). Because of more distance, the lower edge of this aurora was below visible horizon and it is impossible to make similar estimations. Out-of-focus images of the stars give an interval of surface brightness in aurora 6 to 30 kR.