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Earth, Planets and Space
Fig. 5 | Earth, Planets and Space

Fig. 5

From: New advantages of the combined GPS and GLONASS observations for high-latitude ionospheric irregularities monitoring: case study of June 2015 geomagnetic storm

Fig. 5

Two-dimensional ROTI maps derived from the combined GPS and GLONASS observations over the southern hemisphere for a quiet day of June 20 and disturbed days of b June 22 and c June 23, 2015. Each vertical row shows the ROTI maps constructed with 1 h resolution and shown here with 4-h interval. Black dot depicts location of the geomagnetic pole. Full set of the two-dimensional maps over both hemispheres with 1-h time interval is available in the supporting materials as Additional file 1: S1, Additional file 2: S2, Additional file 3: S3 respectively to June 20, June 22 and June 23 of year 2015

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