Relative positions of Type I and Type III solar meterwave bursts

Solar meter-wave noise storms commonly show continuum and short-lived narrow-band bursts (Type I) at high frequencies and fast-drift bursts (Type III) at low frequencies. According to a model proposed by Kai (1970), Type I and Type III sources are always separated on the sun. The present investigation was conducted to restudy the involved questions. It is found that, in contrast to Kai's conclusions, Type I and Type III emissions often appear from the same point on the Sun. After an evaluation of the relation between the observed phenomena and magnetic field characteristics, it is concluded that those Type I emissions that are accompanied by Type III emissions (and perhaps all Type I emissions) arise on open or quasi-open magnetic field lines.