a) The field of view over AR8253 taken at 1998-07-01 01:01 UT in TRACE 171 Å bandpass, the region of interest (ROI) in the white box includes the fan-like structure and is re-sized to the left, an off-ROI region including the weakest intensity area is marked to the top. b) The region of interest (128 × 128 pixels) showing the fan-like structure; a slit of the macro-pixels (3 × 3) is selected along the fan. c) The intensity map of 17 GHz radio emission over AR8253 at 1998-07-01 01:01 UT. The contour in dashed line marked the sunspot area.
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