Astronomy and Astrophysics – Astrophysics
Scientific paper
Oct 1988
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988a%26a...205..354v&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 205, no. 1-2, Oct. 1988, p. 354-360.
Astronomy and Astrophysics
Astrophysics
13
Astronomical Photography, Faculae, Image Motion Compensation, Sunspots, Image Processing, Power Spectra, Solar Observatories, Spatial Resolution
Scientific paper
An image motion stabilizer that locks on confined areas which are brighter or darker than the surrounding photosphere was used to measure some characteristics of atmospheric image motion at the Vacuum Tower telescope of the National Solar Observatory. The device stabilizes images of sunspots, pores, and faculae. Recordings of the drive signals were analyzed. Image motion between 0.3 and 0.5 arcsec rms was measured, power spectra of the recordings show roughly the behavior predicted theoretically for frequencies below 1 Hz and a much steeper decrease for frequencies larger than 5 Hz. Residual motion measured at various distances away from the stabilized area shows an increase over some 100 arcsec. The residual rms motion is less than the theoretical resolution of the telescope within roughly 30 arcsec around the stabilized area.
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