Fig. 2: EUV and microwave emissions of the flare.
From: Microwave imaging of quasi-periodic pulsations at flare current sheet
a SDO/AIA 211 Å images showing the erupting filament and induced EUV brightenings. b EOVSA microwave images displaying the distribution and evolution of the flare brightness temperature, Tb, at 4.4 GHz. c SDO/AIA 211 Å images with superimposed microwave contours. The color from purple to yellow correspond to frequencies from 3.4 GHz to 10.4 GHz. There are two groups of contours, each of which shows 80% of the highest Tb in the strong and weak sources, respectively. d A schematic diagram interpreting the magnetic field structure during the eruption. The wide curve in grey represents the erupting filament with the overlying field in gold and purple. The ovals in shallower and deeper grey represent magnetic positive and negative polarities, respectively. The circles in blue and red, from shallower to deeper with decreasing frequency, indicate the strong and weak microwave sources locating at the flare loops and reconnection CS region, respectively.
