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We discuss an intriguing type II radio burst that occurred on 2011 March 27.The dynamic spectrum was featured by a sudden break at about 43 MHz on thewell-observed harmonic branch. Before the break, the spectrum drifted graduallywith a mean rate of about -0.05 MHz/s. Following the break, the spectrum jumpedto lower frequencies. The post-break emission lasted for about three minutes.It consisted of an overall slow drift which appeared to have a few fast driftsub-bands. Simultaneous observations from the Solar TErrestrial RElationsObservatory (STEREO) and the Solar Dynamics Observatory (SDO) were alsoavailable and are examined for this event. We suggest that the slow-driftperiod before the break was generated inside a streamer by a coronal eruptiondriven shock, and the spectral break as well as the relatively wide spectrumafter the break is a consequence of the shock crossing the streamer boundarywhere density drops abruptly. It is suggested that this type of radio burstscan be taken as a unique diagnostic tool for inferring the coronal densitystructure, as well as the radio emitting source region.

A broken solar type II radio burst induced by a coronal shock propagating across the streamer boundary