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Geophysics. Cosmic physics
3
Meteorology. Climatology
3
QC801-809
3
QC851-999
3
ionosphere
3
ionogram
2
critical frequency
1
deep learning
1
doppler sounding
1
electron density
1
height-time diagram
1
median height-time diagram
1
median value
1
pattern recognition
1
travelling ionospheric disturbances
1
weddell sea anomaly
1
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