The Imaging Vector Magnetograph at Haleakala

Details The Imaging Vector Magnetograph at Haleakala The Imaging Vector Magnetograph at Haleakala

Oct 1996

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996soph..168..229m&link_type=abstract

Solar Physics, Volume 168, Issue 2, pp.229-250

Physics

90

Scientific paper

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 Hα polarization movies of flaring regions.

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