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Fig. 8.

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Shock wave association with the LF-type II radio burst. Panel a: modelled pressure wave with the values of MA plotted on its surface around the start time of LF-type II radio burst. The colour-coded source regions named R1−R4 represent the LF-type II source regions observed in the time interval between 00:25 and 00:50 UT. The varying diameters of the source regions account for the large source sizes obtained from the radio triangulation results. Panel b: temporal evolution of the Alfvén mach number (MA) in the selected regions which are represented by the colored median lines. The quartiles and decile values are shown only for R4. The temporal evolution of the θBN in all regions is presented in panel c.

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