ELECTRON ACCELERATION AT QUASI-PARALLEL SHOCKS IN THE SOLAR CORONA AND ITS SIGNATURE IN SOLAR-TYPE-II RADIO-BURSTS

Recently, strong large amplitude magnetic field structures(SLAMS) have been observed as a common phenomenon in the vicinity of the quasi-par allel region of Earth's bow shock. A quasi-parallel shock transition c an be considered as patchwork of SLAMS. Using the data of AMPTE/IRM ma gnetometer the properties of SLAMS are studied. Within SLAMS the magne tic field is strongly deformed and, thus, the magnetic field geometry is locally swung into a quasi-perpendicular regime. Therefore, electro ns can locally be accelerated to high energies within SLAMS. Assuming that SLAMS also exist in the vicinity of supercritical, quasi-parallel shocks in the solar corona, they are able to generate radio radiation via the enhanced Langmuir turbulence excited by the accelerated elect rons. Since SLAMS are connected with strong density enhancements, the aforementioned mechanism can explain the multiple-lane structure often occurred in solar Type II radio bursts.