| Autor: |
Mickey, D. L., Canfield, R. C., LaBonte, B. J., Leka, K. D., Waterson, M. F., Weber, H. M. |
| Zdroj: |
Solar Physics; October 1996, Vol. 168 Issue: 2 p229-250, 22p |
| Abstrakt: |
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 Ha polarization movies of flaring regions. |
| Databáze: |
Supplemental Index |
| Externí odkaz: |
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