Multichannel solar photometer
Institute of Terrestrial Magnetism, Ionosphere and Radio Wave Propagation (IZMIRAN)
Main Astronomical Observatory, National Academy of Sciences (GAO NANU), Ukraine
Astrophysikalisches Institut Potsdam (AIP), Germany
Multichannel solar photometer DIFOS was designed to perform high-precision continuous
observations of the solar radiation intensity variations. These observations onboard the
CORONAS-F spacecraft are aimed at the study of p- and, possibly, g-modes of the
global solar oscillations.
The design and technical characteristics of the DIFOS photometer are similar to SPM
photometers onboard the SOHO spacecraft.
Having comparable to SOHO devices measuring capabilities DIFOS has twice as much
observational spectrum bands and spans two times wider spectrum range from lower UV to
infrared (350 nm - 1500 nm).
Comparing spectrum bands of observations of the SOHO and CORONAS-F projects
- radiation intensity is measured simultaneously in 6 optical spectrum bands
by 8 photosensors: 350, 500, 650 (two measurement channels),
850 (two measurement channels ), 1100 and 1500 nanometers with the measuring bandwidth below 10% of
the value of central wavelength.
- relative intensity resolution is 2È10-6 of
the total solar radiation intensity.
- temporal resolution of intensity measurements - 33.5 sec.
- spacial resolution is not available.
- photometer observation angle - 2°.
- precision of the photometer orientation towards the center of the solar disk is
better than 10 arc. min (provided by the orientation system of the AUOS-SM).
- the photometer consists of the photosensors unit PU and electronics unit EU.
- PU - 130È130È500 mm.
- EU - 120È230È210 mm.
- PU - 4.0 kg.
- EU - 2,0 kg.
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