The flares of July 6 and 8, 1968

From our analysis of the flares of July 6, 1968 and July 8, 1968 the following points emerge: 1) The limb flare of July 6 has been observed in white light for approximately ten minutes during the maximum emission of the electromagnetic radiations. This observation fits the preceding observations of white light flares. The radio flux and radio spectrum hint to the nature of a PF. Corpuscular radiation up to more than 190 MeV has been detected from the spacecraft, Pioneer 6 and Pioneer 7. 2) The region of the proton flare has been characterized by the presence of a Delta magnetic configuration very probably due to the interaction of two different solar centers. This circumstance is quite common in the elaboration of the most active regions. 3) The flare of July 6 has been followed on July 8 by a similar event both for the optical appearance and for the associated electromagnetic radiation. 4) The flare of July 8 has shown the characteristics of the proton flares: coverage of the spots, scission in two ribbons, outstanding radio microwave emission, type IV burst, U radio spectrum etc..., however it has not been followed by a particle flux at the Earth (PCA) or measured in space by the satellites.