The San Fernando Observatory Video Spectra-Spectroheliograph

Details The San Fernando Observatory Video Spectra-Spectroheliograph The San Fernando Observatory Video Spectra-Spectroheliograph

Jul 1996

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996soph..166..267w&link_type=abstract

Solar Physics, Volume 166, Issue 2, pp.267-285

Physics

6

Scientific paper

We describe recent work in the development of the San Fernando Observatory (SFO) Video Spectra-Spectroheliograph (VSSHG), a spectrum-based instrument for the measurement of the solar Stokes profiles. Its most important features are: simultaneous measurement of Stokes I plus one of Stokes Q, U, or V; spatial sampling of 0.5 arc sec; spectral sampling of 8.8 mÅ; and time sampling of one minute (for one pair of Stokes profile) to three minutes (for all four profiles). Routine data processing is carried out using a moments technique; tests of this technique show it to be reasonably accurate. Sample data are shown and briefly discussed: a longitudinal magnetogram and Dopplergram of NOAA 5573 observed on 17 August, 1989, and a vector magnetic field map and Dopplergram of NOAA 6659 observed on 10 June, 1991.

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