A NEW THEORY OF PROCESSES IN THE EARLY SO LAR-SYSTEM

Astronomical evidence is presented for a new theory concerning the pro cesses in the early solar system. This evidence includes data on inten se flares of protostars with a period of 5 x 10(4) years accompanied b y bipolar gas outflows and a strong stellar wind, whose shock waves se rve to rework the material of the accretion disk. Further support come s from the available meteorite data on primordial noble gases, the eff ects of preaccretion irradiation of grains by low-energy VH nuclei and protons of solar flares, and distinctive features of chondrules chond rites of various in compositional groups. A possible scenario for chon drule genesis at various evolutionary stages of the Sun and the primit ive solar nebula is proposed. Most chondrules and CAl of carbonaceous chondrites formed by the melting of primitive aggregates during the FU Ori stage, when intense protosolar flares reached a peak (t similar t o 10(5) yr). The majority of chondrules of ordinary chondrites formed over a period of a few million years during the T Tauri stage by the m elting of SO2-enriched solar-gas condensate aggregates due to local fl ares caused by the annihilation of magnetic fields and shock waves in the dust disk. In the shock waves, protons and multiply charged ions a ccelerated and interacted with atoms at the surface of chondrules, the ir fragments, and matrix crystals, producing tracks of VH nuclei and c osmogenic isotopes. The high VH and concentrations of B-type gases in brecciated gas-rich meteorites and CM chondrites are explained within a model of catastrophic fragmentation of large bodies and subsequent r eassembly of the fragments.