High energetic solar proton flares on the declining phase of solar cycle 22

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During the declining phase of the solar cycle 22, in June 1991, energetic flares were produced by active regions NOAA/USAF 6659. The associated solar proton events affected the earth environment. An evaluation of the solar activity during the first half of June 1991 was made, leading to a possible method for high energetic solar flares prediction. The method depend on cumulative summation curves of the H-alpha flares, and x-ray bursts, in the active region 6659 during the rotation when the energetic solar flares of June 1991 have occurred. It is shown that a steep trend of increased activity begins several tens of hours prior to the occurrence of the energetic flare.