a) The 3 GHz radio flux recorded by the Ondřejov radiospectrograph at 09:01−11:01 UT. b) The 0.8−2.0 GHz radio spectrum observed at Ondřejov during the time interval 08:38:00−09:38:00 UT. c) The detailed 0.8−2.0 GHz radio spectrum showing the narrow-band dm-spikes (bright points on the spectrum). The horizontal black lines delineate artificial radio sources. d) The detailed 0.8−2.0 GHz radio spectrum showing a series of drifting pulsating structures. At 9:03:40−9:03:55 UT, the bi-directional type III bursts starting at the frequency 1.3 GHz can be seen. Furthermore, the reverse drift DPS is in the time interval 9:05:35−9:05:55 UT in the 1.3−1.65 GHz frequency range.
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