Variability of solar IRradiance and Gravity Oscillations / Sun PhotoMeters
The scientific objective of the VIRGO experiment (Variability of solar IRradiance and Gravity Oscillations) on board SOHO (Solar and Heliospheric Observatory) is to determine the characteristics of pressure and internal gravity oscillations by observing irradiance and radiance variations, to measure the solar total and spectral irradiance, and to quantify their variability over periods of days to the duration of the mission. With these data helioseismological methods can be used to probe the solar interior.