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114 Physical sciences
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115 Astronomy
1
CHAMP SATELLITE
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CORONAL MASS EJECTIONS
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CYCLE
1
EARTH INTERPLANETARY CONDITIONS
ELEMENTARY CURRENT SYSTEMS
1
Geomagnetism and paleomagnetism
1
IONOSPHERIC CURRENTS
1
MAGNETIC-FIELD
1
MAGNETOSPHERE
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PAST 167 YR
1
STORMS
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Space science
1
time variations diurnal to secular
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