Radio evidence for shock acceleration of electrons in the solar corona

Astronomy and Astrophysics – Astronomy

Scientific paper

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Electron Acceleration, Shock Wave Propagation, Solar Corona, Solar Electrons, Solar Radio Bursts, Kilometric Waves, Solar Flares, Solar Protons

Scientific paper

It is pointed out that the new class of kilometer-wavelength solar radio bursts observed with the ISEE-3 Radio Astronomy Experiment occurs at the reported times of type II events, which are indicative of a shock wave. An examination of records from the Culgoora Radio Observatory reveals that the associated type II bursts have fast drift elements emanating from them; that is, a herringbone structure is formed. It is proposed that this new class of bursts is a long-wavelength continuation of the herringbone structure, and it is thought probable that the electrons producing the radio emission are accelerated by shocks. These new events are referred to as shock-accelerated events, and their characteristics are discussed.

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