Аннотация:The main results of spectral observations of solar radiation in the range NUV 297–330
nm obtained at Novolazarevskaya station (Antarctica) in the 24-th cycle of solar activity
(2008–2017) are presented. In the analysis of the data the inverse dependence of the course of
the average season (September-February) values of standard deviations (SD) of radiation on
the values of total solar radiation (TSI) is established. In the analysis periodogram revealed
the time range of the radiation with harmonics 3–10 min, 20–30 min, ~50–60 min, 160–170
min. The resulting estimate of when the left bound of the range (NUV 297–305 nm) with the
level of the mesopause (r~ 0.75).