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Earth, Planets and Space
Fig. 2 | Earth, Planets and Space

Fig. 2

From: Occurrence characteristics and lowest speed limit of subauroral polarization stream (SAPS) observed by the SuperDARN Hokkaido East radar

Fig. 2

Example of SuperDARN and NOAA particle data on December 15, 2012. The two-dimensional radar data show LOS velocity at 1420 UT. The color tile shows direction and speed of LOS velocity. The green and blue regions indicate the flows going away from the radar, and the yellow and red regions show flows toward the radar. The NOAA 19 satellite data along its footprint going equatorward show precipitation energy flux for 1400–1430 UT, obtained from TED instrumentation; the aqua color corresponds to flux over 100 mW/m2, and the purple color to flux less than 100 mW/m2. This precipitation flux can distinguish the subauroral region (flux <100 mW/m2) from the auroral oval (flux >100 mW/m2)

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