Physics – Optics
Scientific paper
Jun 1993
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993alab.reptq....h&link_type=abstract
Final Report Alabama Univ., Huntsville. Dept. of Physics.
Physics
Optics
Cassegrain Optics, Heliostats, Line Spectra, Magnetic Signatures, Modulation Transfer Function, Photosphere, Polarimetry, Solar Spectra, Spectrum Analysis, Sunlight, Systems Analysis, Aberration, Angular Resolution, Diffraction, Interferometers, Line Of Sight, Magnetic Fields, Mirrors, Seeing (Astronomy), Spatial Resolution
Scientific paper
The MSFC's Experimental Vector Magnetograph (EXVM) is an instrument that observes a 4.4 x 8.8 arcmin field of the sun. The transverse and longitudinal components of the surface magnetic field and the line-of-sight velocities of the photospheric gases can be determined from polarimetric and spectral analysis of the 525.02 nm absorption line of Fe 1. The EXVM has been breadboarded and tested in the laboratory. The optics of the EXVM were tested with a point-diffraction (Smartt) interferometer. The 12 inch Cassegrain telescope was found to have 0.20 waves RMS (at 525.02 nm) of aberration. The post-telescope relay optics were nearly diffraction limited on-axis and had about one wave of primary coma as the predominant aberration at full-field. From theoretical modulation transfer function (MTF) curves of known aberrations, it was concluded that the EXVM should attain a maximum spatial resolution of about 0.5 arcseconds. A resolution test target indicated maximum angular resolutions better than 0.6 arcsec on-axis and 0.7 arcsec at full-field-of-view. A 2D inch heliostat (sun-tracking mirror) was used to direct sunlight into the lab and into the EXVM. Solar images obtained were limited by atmospheric seeing effects. During brief moments of good seeing, angular resolutions of about 1 arcsecond were realized with the EXVM.
Chipman Russell A.
Hillman Lloyd W.
Smith Murray H.
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