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VIRGO: Experiment for helioseismology and solar irradiance monitoring
- Source :
- Solar Physics. 162:101-128
- Publication Year :
- 1995
- Publisher :
- Springer Science and Business Media LLC, 1995.
-
Abstract
- The scientific objective of the VIRGO experiment (Variability of solar IRradiance and Gravity Oscillations) 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. Certain characteristics of convection and its interaction with magnetic fields, related to, for example, activity, will be studied from the results of the irradiance monitoring and from the comparison of amplitudes and phases of the oscillations as manifest in brightness from VIRGO, in velocity from GOLF, and in both velocity and continuum intensity from SOI/MDI. The VIRGO experiment contains two different active-cavity radiometers for monitoring the solar ‘constant’, two three-channel sunphotometers (SPM) for the measurement of the spectral irradiance at 402, 500 and 862 nm, and a low-resolution imager (LOI) with 12 pixels, for the measurement of the radiance distribution over the solar disk at 500 um. In this paper the scientific objectives of VIRGO are presented, the instruments and the data acquisition and control system are described in detail, and their measured performance is given.
- Subjects :
- Physics
Brightness
Radiometer
Irradiance
Astronomy
Astronomy and Astrophysics
Photometer
Solar physics
Solar irradiance
law.invention
Space and Planetary Science
law
Radiance
Astrophysics::Solar and Stellar Astrophysics
Astrophysics::Earth and Planetary Astrophysics
Helioseismology
Remote sensing
Subjects
Details
- ISSN :
- 1573093X and 00380938
- Volume :
- 162
- Database :
- OpenAIRE
- Journal :
- Solar Physics
- Accession number :
- edsair.doi...........a04a52eccb36d93e82e23cbed495c2ba