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geomagnetic activity
secular variations
4
general magnetic field of the Sun
2
magnetic anomalies
2
magnetospheric and ionospheric sources ;
2
solar activity
2
Geophysics. Cosmic physics
1
Meteorology. Climatology
1
QC801-809
1
QC851-999
1
auroral zone
1
ionospheric currents
1
magnetotellurics
1
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