Radio evidence for electron acceleration by transverse shock waves in herringbone Type II solar bursts

Shock wave acceleration of electrons in the solar corona is analyzed by means of radio observations of Type II bursts containing herringbone structure. The model by which the observations are explained assumes that the shock waves propagate more or less transversely to open magnetic field lines in the corona, thus allowing the electrons to escape along the field lines and produce the herringbone features. The simplest interpretation for tangential source motion in Type II bursts containing herringbone features is to assume that the Type II disturbance travels across a radial magnetic field.