Abstract
A comparison of EUV data from the Harvard College Observatory experiment on OSO-6 with photospheric magnetograms from Kitt Peak National Observatory indicates a bipartite relationship between values of the longitudinal field strength B and Mg x intensity I averaged over square areas 35″ × 35″: in quiet regions ¦B¦ ∼ Ik, where 0.0 ≲ k ≲ 0.3, and in active regions ¦B¦ ∼ I. From these relationships we infer that ¦B¦ ∼ ne2k in quiet regions and ¦B¦ ∼ ne2 in active regions. In addition, the photospheric field beneath a coronal hole is found to be virtually identical to that beneath normal quiet regions.
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