Solar Magnetograms at 12 μm Using the Celeste Spectrograph

Details Solar Magnetograms at 12 μm Using the Celeste Spectrograph Solar Magnetograms at 12 μm Using the Celeste Spectrograph

Apr 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007soph..241..213m&link_type=abstract

Solar Physics, Volume 241, Issue 2, pp.213-222

Physics

3

Scientific paper

We present the first solar vector magnetogram constructed from measurements of infra-red Mg I 12.32-μm line spectra. Observations were made at the McMath-Pierce Telescope using the Celeste spectrometer/polarimeter. Zeeman-split Stokes line spectra were fitted with Seares profiles to obtain the magnetic field parameters. Maps of absolute field strength, line-of-sight angle, and azimuth are presented. Analysis shows that the variation in field strength within a spatial resolution element, 2 arcseconds, is greatest in the sunspot penumbra and that this is most likely caused by vertical field strength gradients, rather than horizontal image smearing. Widths of the Zeeman-split σ components, assuming a formation layer thickness of 200 km, indicate that vertical field strength gradients can be as large as 6.5 G/km in a penumbra.

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