Infrared array measurements of sunspot magnetic fields

Details Infrared array measurements of sunspot magnetic fields Infrared array measurements of sunspot magnetic fields

Jun 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992soph..139..255m&link_type=abstract

Solar Physics (ISSN 0038-0938), vol. 139, no. 2, June 1992, p. 255-266. Research supported by Astrophysical Research Consortium

Physics

27

Fraunhofer Lines, Infrared Telescopes, Magnetic Flux, Solar Magnetic Field, Sunspots, Echelle Gratings, Gray Scale, Magnetic Measurement, Mercury Cadmium Tellurides, Zeeman Effect

Scientific paper

A 128 x 128 format HgCdTl IR array has been used with the Sacramento Peak Observatory Vacuum Telescope (VTT) and echelle spectrograph to obtain two-dimensional observations of the true magnetic field strength in a sunspot. All of the spectral information contained in the unpolarized IR Fraunhofer line profile, with time resolution of about a minute is retained. Unlike previous optical observations (cf. Adam, 1990), observations readily allow direct field strength measurements out to the outer edge of the penumbra. The magnetic flux density in the outer penumbra is not well described by an extrapolation of the quadratic polynomial, in normalized central distance, that describes the umbral field.

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