Magnetograph observations with the Swedish solar telescope on La Palma

Details Magnetograph observations with the Swedish solar telescope on La Palma Magnetograph observations with the Swedish solar telescope on La Palma

Apr 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991soph..132..233l&link_type=abstract

Solar Physics (ISSN 0038-0938), vol. 132, April 1991, p. 233-245. Holger Crafoord Foundation-supported research.

Physics

8

Circular Polarization, Magnetic Signatures, Solar Instruments, Solar Magnetic Field, Telescopes, Charge Coupled Devices, Cross Correlation, Image Motion Compensation, Solar Observatories, Sweden

Scientific paper

A high-resolution videomagnetograph that records the images of opposite circular polarization simultaneously has been constructed for the Swedish vacuum solar telescope at La Palma. Magnetograms are obtained by off-line integration of bursts consisting of typically 50 frames of 20-msec exposures, with bad frames rejected, and the frame-to-frame image motion of the remaining frames compensated for by cross-correlation techniques. The short exposures combined with frame selection and elimination of image motion optimizes the resolution and thereby also the S/N, allowing good magnetograms to be obtained with an effective exposure time of less than 1 sec at an image scale of 0.1 arcsec/pixel. The advantages and limitations of the system are discussed and compared with other techniques of making filter magnetograms are discussed.

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