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We present an analysis of the plasma parameters during the initial phase ofthe 12 June 2010 flare (SOL2010-06-12T00:57). A peculiarity of the flare wasthe detection of $\gamma$--emission that is unusual for such weak and shortevent. The analysis revealed the presence of a flare precursor detected about 5minutes before the flare onset in 94 \AA \ images which spatially coincidedwith the non-polarized microwave (MW) source at 17 GHz (\textit{the NobeyamaRadio Heliograph}) that is the Neutral Line associated Source (NLS). Acomparison of the results obtained from MW data by \textit{the Nobeyama RadioPolarimeters} and \textit{the multi-frequency Siberian radioheliograph} (thenew 10-antenna radio heliograph prototype at 4.6 and 6.4 GHz) and hard X-ray(HXR) observations by \textit{the Fermi Gamma-ray Space Telescope} reveal thepresence of accelerated electrons during the flare initial phase. The analysisof MW and HXR spectra also confirms the presence of accelerated particles.Moreover a good temporal correlation between several lightcurves in differentHXR energy bands and at MW frequencies indicates generation of both HXR and MWemission by a common population of accelerated electrons. Detection ofaccelerated particles during the initial phase of the flare andsoft-hard-harder (SHH) behavior of the spectra indicate several episodes ofparticle acceleration and confirm the non-impulsive type of the flareevolution.

Detection of acceleration processes during the initial phase of the 12 June 2010 flare