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Earth, Planets and Space
Fig. 4 | Earth, Planets and Space

Fig. 4

From: Imaging high-latitude plasma density irregularities resulting from particle precipitation: spaceborne L-band SAR and EISCAT observations

Fig. 4

SAR sub-band azimuth shift derived from raw ALOS-2 SAR data for February 9, 2017. The image is shown with SAR acquisition data collected at 21:51:28 UT and 21:51:36 UT shown in Fig. 2. White areas denote gaps in data resulting from scattering and water masks. Positive (blue) and negative (red) azimuth shifts are distributed as patches of under 1 km. For ionospheric piercing observed at half the satellite altitude, a 1-m sub-band azimuth shift corresponds to a 1 [mTECU/km] TEC gradient. Positive shifts forming a larger east–west structure are observed at the 70-degree latitude line. The green area shows gradual changes in background TEC

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