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*SOLAR DISTURBANCES
*COSMIC RAYS
1
*IONOSPHERIC DISTURBANCES
1
*METEOR BURST COMMUNICATIONS
1
*METEOR SCATTER COMMUNICATIONS
1
*POLAR CAP ABSORPTION
1
*PROTONS
1
*RADIO ASTRONOMY
1
*RADIO INTERFERENCE
1
ASTRONOMICAL OBSERVATORIES
1
BALLOONS
1
D REGION
1
DATA ACQUISITION
1
ELECTRON DENSITY
1
FISCAL YEAR 93
1
HIGH LATITUDES
1
IONIZATION
1
IONOSPHERE
1
MAGNETIC FIELDS
1
MAGNETIC PROPERTIES
1
MAGNETIC STORMS
1
PE62101F
1
PROPAGATION
1
RADIO TRANSMISSION
1
RADIO WAVES
1
Radiofrequency Wave Propagation
1
SBI1
1
SOLAR FLARES
1
SOLAR PROTON EVENT
1
SUNSPOTS
1
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