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We present multispectral analysis (radio, H$\alpha$, UV/EUV, and hard X-ray)of a confined flare from 2015 March 12. This flare started within the activeregion NOAA 12 297 and then it expanded into a large preexisting magnetic ropeembedded with a cold filament. The expansion started with several brighteningslocated along the rope. This process was accompanied by a group of slowlypositively drifting bursts in the 0.8--2 GHz range. The frequency drift ofthese bursts was 45 -- 100 MHz s$^{-1}$. One of the bursts had an S-like form.During the brightening of the rope we observed an unique bright EUV structuretransverse to the rope axis. The structure was observed in a broad range oftemperatures and it moved along the rope with the velocity of about 240 kms$^{-1}$. When the structure dissipated, we saw a plasma further followingtwisted threads in the rope. The observed slowly positively drifting burstswere interpreted considering particle beams and we show that one with theS-like form could be explained by the beam propagating through the helicalstructure of the magnetic rope. The bright structure transverse to the ropeaxis was interpreted considering line-of-sight effects and thedissipation-spreading process, which we found to be more likely.

Flare Expansion to a Magnetic Rope Accompanied by Rare Radio Bursts