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(a) Longitude and latitude variations of DMSP F12 Ni measured at nightside 21:30 LT around the June Solstice of 1996. The thick black lines denote that geomagnetic declination is zero and the thin gray lines are geomagnetic inclination isolines. (b) The distribution of Ni in geomagnetic coordinates. Two black dotted lines denote the solar terminators at 300 km height at 21:30 LT (the upper line) and 20:30 LT, respectively. (c) Ni longitude fluctuations with longitudinal averages removed for each geomagnetic latitude.

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