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GEOMAGNETISM
2
(*AURORAE
1
(*IONOSPHERE
1
*AURORAE
1
ARTIFICIAL SATELLITES
1
ATMOSPHERICS
1
ATTENUATION
1
AUDIO FREQUENCY
1
AURORAE)
1
DIFFRACTION
1
DIURNAL VARIATIONS
1
ELECTROMAGNETIC RADIATION
1
ELECTRONS
1
EXTRATERRESTRIAL RADIO WAVES
1
GEOPHYSICS
1
HEIGHT FINDING
1
IONOSPHERE
1
IONOSPHERE)
1
MAGNETOOPTICS
1
NAVIGATION SATELLITES
1
NORWAY
1
POLAR REGIONS
1
SCIENTIFIC SATELLITES
1
SCINTILLATION COUNTERS
1
SWEDEN
1
TRANSIT
1
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