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Solar Physics

, Volume 12, Issue 1, pp 69–83 | Cite as

Simultaneous measurements of magnetic fields and brightness fields using a 4-image spectroheliograph

  • N. R. SheeleyJr
  • O. Engvold
Article

Abstract

The use of an auxiliary beamsplitter with the Kitt Peak 15-foot spectroheliograph permits spectroheliograms to be taken simultaneously in 4 identical images of the sun. By using two of these images for a Zeeman spectroheliogram, a third image for a Fei λ4071 spectroheliogram, and the fourth image for a 6107Å continuum spectroheliogram, simultaneous measurements of magnetic fields and brightness fields have been obtained. Within the limits of intensity variations imposed by doppler shifts and brightness fluctuations of the continuum, a quantitative relation does exist between the measured values of brightness and magnetic field strength of the photospheric network. For intensities measured +0.12 Å from the core of Fei λ4071, this relation is ln(1 +ΔI/I) = α¦B¦, whereB refers to the component of magnetic field normal to the solar surface,ΔI/I is the fractional excess of brightness of the magnetic regions relative to the brightness of non-magnetic regions, and α = (6±2)%/100 gauss.

Keywords

Magnetic Field Field Strength Intensity Variation Quantitative Relation Magnetic Field Strength 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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Copyright information

© D. Reidel Publishing Company 1970

Authors and Affiliations

  • N. R. SheeleyJr
    • 1
  • O. Engvold
    • 2
  1. 1.Kitt Peak National ObservatoryTucsonUSA
  2. 2.Institute for Theoretical AstrophysicsOsloNorway

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