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The Kitt Peak Magnetograph. IV: 40-Channel Probe and the Detection of Weak Photospheric Fields

  • W. Livingston (a1) and J. Harvey (a1)

Abstract

The 40-channel magnetograph is described. Special attention is given to details of the fiber-optic probe which dissects the Fraunhofer line image and provides for a choice of spectral and spatial resolution. Examples of magnetograms taken with the instrument are shown. Maps of quiet areas, made with long integration times to achieve a noise of 0.4 G, yet with 5 arc-sec resolution, indicate the presence everywhere of a minimum background field of average strength 2–3 G.

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Copyright

References

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Beckers, J. M.: 1968, Solar Phys. 5, 15.
Chapman, G. A. and Sheeley, N. R. Jr.: 1968, Solar Phys. 5, 442.
Harvey, J. and Livingston, W.: 1969, Solar Phys. 10, 283.
Livingston, W. and Harvey, J.: 1971, (paper I) submitted to Solar Phys.
Harvey, J. and Livingston, W.: 1971, (paper II) submitted to Solar Phys.
Livingston, W., Harvey, J., and Slaughter, C.: 1970, (paper III) IAU Colloquium No. 11, Automation in Optical Astrophysics , Edinburgh, 12–14 August, 1970.
Van Speybroeck, L., Krieger, A., and Vaiana, G.: 1970, Nature 227, 818.

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