Solar Magnetograms at 12 μm Using the Celeste Spectrograph

Thomas G. Moran, Donald E. Jennings, L. Drake Deming, George H. McCabe, Pedro V. Sada, Robert J. Boyle

Research output: Contribution to journalArticle

6 Citations (Scopus)

Abstract

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.
Original languageEnglish
Pages (from-to)213-222
JournalSolar Physics
Volume241
Issue number2
DOIs
Publication statusPublished - 1 Apr 2007
Externally publishedYes

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magnetic signatures
spectrographs
field strength
line spectra
sunspot
azimuth
penumbras
polarimeters
sunspots
magnetic field
line of sight
telescopes
gradients
profiles
magnetic fields
parameter
analysis

Cite this

Moran, T. G., Jennings, D. E., Deming, L. D., McCabe, G. H., Sada, P. V., & Boyle, R. J. (2007). Solar Magnetograms at 12 μm Using the Celeste Spectrograph. Solar Physics, 241(2), 213-222. https://doi.org/10.1007/s11207-007-0271-1
Moran, Thomas G. ; Jennings, Donald E. ; Deming, L. Drake ; McCabe, George H. ; Sada, Pedro V. ; Boyle, Robert J. / Solar Magnetograms at 12 μm Using the Celeste Spectrograph. In: Solar Physics. 2007 ; Vol. 241, No. 2. pp. 213-222.
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Moran, TG, Jennings, DE, Deming, LD, McCabe, GH, Sada, PV & Boyle, RJ 2007, 'Solar Magnetograms at 12 μm Using the Celeste Spectrograph', Solar Physics, vol. 241, no. 2, pp. 213-222. https://doi.org/10.1007/s11207-007-0271-1

Solar Magnetograms at 12 μm Using the Celeste Spectrograph. / Moran, Thomas G.; Jennings, Donald E.; Deming, L. Drake; McCabe, George H.; Sada, Pedro V.; Boyle, Robert J.

In: Solar Physics, Vol. 241, No. 2, 01.04.2007, p. 213-222.

Research output: Contribution to journalArticle

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AU - Moran, Thomas G.

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AU - Boyle, Robert J.

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AB - 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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Moran TG, Jennings DE, Deming LD, McCabe GH, Sada PV, Boyle RJ. Solar Magnetograms at 12 μm Using the Celeste Spectrograph. Solar Physics. 2007 Apr 1;241(2):213-222. https://doi.org/10.1007/s11207-007-0271-1