The imaging vector magnetograph at Haleakala |
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Authors: | D L Mickey R C Canfield B J LaBonte K D Leka M F Waterson H M Weber |
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Institution: | (1) Institute for Astronomy, University of Hawaii, 2680 Woodlawn Drive, 96822 Honolulu, HI, U.S.A.;(2) Present address: Advanced Study Program, National Center for Atmospheric Research, P.O. Box 3000, 80307 Boulder, CO, U.S.A.;(3) Present address: Canada France Hawaii Telescope Corporation, P.O. Box 1597, 94643 Kamuela, HI, U.S.A. |
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Abstract: | We describe an instrument we have built and installed at Mees Solar Observatory on Haleakala, Maui, to measure polarization in narrow-band solar images. Observations in Zeemansensitive photospheric lines have been made for nearly all solar active regions since the instrument began operations in 1992. The magnetograph includes a 28-cm aperture telescope, a polarization modulator, a tunable Fabry-Pérot filter, CCD cameras and control electronics. Stokes spectra of a photospheric line are obtained with 7 pm spectral resolution, 1 arc sec spatial resolution over a field 4.7 arc min square, and polarimetric precision of 0.1%. A complete vector magnetogram observation can be made every eight minutes. The flexibility of the instrument encourages diverse observations: besides active region magnetograms we have made, for example, composite vector magnetograms of the full solar disk, and H polarization movies of flaring regions. |
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