Fig. 1
Dynamic spectrum of two J-bursts and 1 U-burst, the three strongest bursts during a storm of bursts observed with the LOFAR LBA on 6 May 2015. The colour bar denotes the signal above the background frequency taken at a quiet time. The box in the bottom right shows the U-burst when the frequency drift changes sign. The dynamic range has been reduced to show the faint signal when the drift rate is positive.
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