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Proceedings Paper

Solar Corona Photoelectric Photometer Using Mica Etalons
Author(s): Raymond N. Smartt
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Paper 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.

Paper Details

Date Published: 16 November 1982
PDF: 6 pages
Proc. SPIE 0331, Instrumentation in Astronomy IV, (16 November 1982); doi: 10.1117/12.933486
Show Author Affiliations
Raymond N. Smartt, Sacramento Peak Observatory (United States)

Published in SPIE Proceedings Vol. 0331:
Instrumentation in Astronomy IV
David L. Crawford, Editor(s)

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