Space Weather Data
Daily space weather measurements are available, including:
Composite Lyman-alpha - A composite plot of solar Lyman-alpha measurements from 1947 to the present.
Composite Magnesium II Index - The Mg II Index is a proxy for solar chromospheric variability.
SORCE Magnesium II Index - The MgII core-to-wing ratio is computed several times a day from calibrated SORCE SOLSTICE measurements.