Abstract The main scientific objective of the VIRGO Experiment (Variability of solar IRradiance and Gravity Oscillations) on SOHO is to probe the solar interior by helioseismology with p- and g-mode solar oscillations determined from spectral irradiance (SPM) and radiance (LOI) variations on time scales of minutes to the mission time. The emphasis will be on the physical and dynamic structure in the vicinity of the solar core. In combination with the two other Helioseismology experiments on SOHO one will study excitation and damping of p and possibly global g-modes. Moreover, the measurements of the variability of the solar “constant” and spectral irradiance over periods of days to the mission time will yield information about solar surface structures, the solar flux budget and accurate inputs for terrestrial climate modelling. The VIRGO experiment contains two types of active cavity radiometers for monitoring of the solar “constant”, two three channel sunphotometers (SPM) for the measurement of spectral irradiance at 395, 500 and 865 nm and a low resolution imager (LOI) with 12 pixels. The status of the instrument development will be described.


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    Title :

    Virgo-solar irradiance and radiance monitoring on SOHO


    Contributors:

    Published in:

    Publication date :

    1991-01-01


    Size :

    10 pages




    Type of media :

    Article (Journal)


    Type of material :

    Electronic Resource


    Language :

    English



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