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Solar radiation
Abundances
1
Andean Region
1
Calcium
1
Calibration
1
Chromosphere
1
Chromospheres
1
Climatic indicators
1
Dunn Solar Telescope
1
Fluxes
1
Follow up
1
Helium
1
Little Ice Age
1
Low level
1
Mathematical models
1
National Solar Observatory
1
Observatories
1
Patagonia
1
Positive correlations
1
Radiative Transfer
1
Rivers
1
Secular trend
1
Sodium
1
Solar Activity
1
Solar activities
1
Solar activity
1
Solar cycle
1
Solar energy
1
South America
1
South American rivers
1
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