Bidimensional analysis of solar active regions and flares. I Imaging specroscopy with Universal Birefringent Filters

Details Bidimensional analysis of solar active regions and flares. I Imaging specroscopy with Universal Birefringent Filters Bidimensional analysis of solar active regions and flares. I Imaging specroscopy with Universal Birefringent Filters

Dec 1983

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983soph...89..323c&link_type=abstract

Solar Physics (ISSN 0038-0938), vol. 89, Dec. 1983, p. 323-339. Research supported by the Consiglio Nazionale delle Ricerche.

Physics

5

Astronomical Spectroscopy, Birefringent Filters, Imaging Techniques, Solar Flares, Solar Spectra, Calibrating, Chromosphere, Filtergrams, Photosphere

Scientific paper

The authors describe a method of solar bidimensional spectroscopy exploiting the performances of a Universal Birefringent Filter (UBF) like that of the Sacramento Peak Observatory, which enables an estimate of the profile of some chromospheric lines with moderate spectral resolution (λ/Δλ = 2.5×104). The numerical inversion technique of Backus and Gilbert has been used to retrieve the estimated line profiles; the capabilities of the proposed method are fully analyzed with some numerical tests and examples. Correction procedures for errors in the positions of the UBF passband, random fluctuations of the exposure times and non-uniform brightness distribution on the filtergrams are also presented. The whole method has been tested on the recovery of quiet atmosphere line profiles and the results derived for the Na D2 line show that the proposed method is completely suitable for many investigations in solar physics.

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