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

Fig. 4

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

Fig. 4

Two-dimensional ROTI maps derived from the combined GPS and GLONASS observations over the northern hemisphere for a quiet day of a 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

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