Solar Corona Photoelectric Photometer Using Mica Etalons

Raymond N. Smartt

doi:10.1117/12.933486

16 November 1982 Solar Corona Photoelectric Photometer Using Mica Etalons

Raymond N. Smartt

Proceedings Volume 0331, Instrumentation in Astronomy IV; (1982) https://doi.org/10.1117/12.933486
Event: 1982 Astronomy Conferences, 1982, Tucson, United States

Abstract

A solar corona photoelectric photometer has been constructed that operates at the three coronal lines, Fe XIV (5302.9 Å), Ca XV (5694.5 Å) and Fe X (6374.5 Å), using mica etalons and narrow-band interference filters. The photometer is used with a 40-cm coronagraph feed. In each case, the corona is discriminated from the sky background, by means of polarization-chopping between the line passband and a reference continuum passband. A mica etalon allows the reference passband to be arbitrarily located in the vicinity of the spectral line. Also, the width of the etalon passbands can be matched to that of the coronal line width, and the transmittance can be high if extremely transparent mica is used. A photomultiplier detects the two signals, their difference being proportional to coronal radiance. The photometer performance is illustrated by radiance plots derived from observations obtained at a fixed height in the corona at equally-incremented field points around the limb.

Citation Download Citation

Raymond N. Smartt "Solar Corona Photoelectric Photometer Using Mica Etalons", Proc. SPIE 0331, Instrumentation in Astronomy IV, (16 November 1982); https://doi.org/10.1117/12.933486

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