A narrow-band tunable solar filter for the near-infrared spectral region

Details A narrow-band tunable solar filter for the near-infrared spectral region A narrow-band tunable solar filter for the near-infrared spectral region

Aug 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999soph..188...81k&link_type=abstract

Solar Physics, v. 188, Issue 1, p. 81-87 (1999).

Physics

1

Scientific paper

A narrow-band tunable solar filter was constructed for the near-infrared spectral region. It is a pre-monochromator consisting of a double monochromator with dispersion subtraction, while the final passband is formed by a scanning Fabry-Pérot interferometer. Such a filter can be realized in practice for any optical spectral region. The tuning range of the filter for the near-infrared is 9000-11000 Å, FWHM of the passband equals 0.24 Å at the Hei 10830 Å line. The angular field of view on the sky is 3.6' for a diameter of the telescope of 100 mm. Filtergrams of the active region NOAA 8076 in the Hei 10830 Å line were obtained on 28 August 1997, the profiles of this line in the selected points of the image, and radial velocity field are presented.

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