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Earth, Planets and Space
Fig. 3 | Earth, Planets and Space

Fig. 3

From: Assessing the performance of a Northeast Asia Japan-centered 3-D ionosphere specification technique during the 2015 St. Patrick’s day geomagnetic storm

Fig. 3

(Top) Variation of Kp and Dst indices during the 2015 St. Patrick’s day geomagnetic storm. (Bottom) The interplanetary magnetic field (IMF) Bz component variation during the same period. Tick labels on top and bottom represent day of the year (DOY) and time in UT (~  LT-9 h), respectively. The sudden storm commencement (SSC) occurred at  ~  04:45 on DOY 076. The main phase (MP) of the storm started at  ~  06:30 UT and continued until  ~  22:00 UT when Dst hit a minimum  ~   −  223 nT. During the MP the Kp rose to a maximum of  ~  8. The recovery phase continued through the following days

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