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An unusual solar burst was observed simultaneously by two decameter radiotelescopes UTR-2 (Kharkov, Ukraine) and URAN-2 (Poltava, Ukraine) on 3 June2011 in the frequency range 16-28 MHz. The observed radio burst has someunusual properties, which are not typical for the other types of solar radiobursts. The frequency drift rate of it was positive (about 500 kHz s$^{-1}$) atfrequencies higher than 22 MHz and negative (100 kHz s$^{-1}$) at lowerfrequencies. The full duration of this event varies from 50 s up to 80 s,depending on the frequency. The maximum radio flux of the unusual burst reaches$\approx 10^3$ s.f.u and its polarization does not exceed 10%. This burst has afine frequency-time structure of unusual appearance. It consists of stripeswith the frequency bandwidth 300-400 kHz. We consider that several accompaniedradio and optical events observed by SOHO and STEREO spacecraft are possiblyassociated with the reported radio burst. A model that may interpret theobserved unusual solar radio burst is proposed.

Unusual Solar Radio Burst Observed at Decameter Wavelengths