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¦ ∼ I k, where 0.0 ≲ k ≲ 0.3, and in active regions ¦B¦ ∼ I. From these relationships we infer that ¦B¦ ∼ n e 2k in quiet regions and ¦B¦ ∼ n e 2 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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Altschuler, M. D. and Perry, R. M.: 1972, Solar Phys. 23, 410.
Altschuler, M. D., Trotter, D. E., and Orrall, F. W.: 1972, Solar Phys. 26, 354.
Burton, W. M.: 1968, in K. O. Kiepenheuer (ed.), ‘Structure and Development of Active Regions’, IAU Symp. 35, 293.
Howard, R.: 1967, Annual Rev. Astron. Astrophys. 5, 1.
Howard, R. (ed.): 1971, ‘Solar Magnetic Fields’, IAU Symp. 43.
Huber, M. C. E., Dupree, A. K., Goldberg, L., Noyes, R. W., Parkinson, W. H., Reeves, E. M., and Withbroe, G. L.: 1973, Astrophys. J. 183, 291.
Livingston, W. and Harvey, J.: 1971, in R. Howard (ed.), ‘Solar Magnetic Fields’, IAU Symp. 43, 51.
Livingston, W., Harvey, J., and Slaughter, C.: 1971 in H. Sedden and M. J. Smyth (eds.), ‘Automation in Optical Astrophysics’, IAU Colloq. 11, 52.
Munro, R. H. and Withbroe, G. L.: 1972, Astrophys. J. 176, 511.
Newkirk, G.: 1972, in C. P. Sonett, P. J. Coleman, Jr., and J. M. Wilcox (eds.), Solar Wind, Washington, U.S. Govt. Printing Office, p. 11.
Noyes, R. W. and Withbroe, G. L.: 1972, Space Sci. Rev. 13, 612.
Perry, R. M. and Altschuler, M. D.: 1973, Solar Phys. 28, 435.
Pneuman, G. W.: 1973, Solar Phys. 28, 247.
Reeves, E. M. and Parkinson, W. H.: 1970, Astrophys. J. Suppl. 21, 1.
Reeves, E. M., Noyes, R. W., and Withbroe, G. L.: 1972, Solar Phys. 27, 251.
Schmidt, H. U.: 1964, in W. N. Hess (ed.), AAS-NASA Symposium on the Physics of Solar Flares, Washington, U.S. Govt. Printing Office, p. 107.
Tousey, R., Sandlin, G. P., and Purcell, J. D.: 1968, in K. O. Kiepenheuer (ed.), ‘Structure and Development of Active Regions’, IAU Symp. 35, 411.
Underwood, J. H. and Muney, W. S.: 1967, Solar Phys. 1, 128.
Withbroe, G. L.: 1970, Solar Phys. 11, 42.
Withbroe, G. L.: 1972, Solar Phys. 25, 116.
Withbroe, G. L., Dupree, A. K., Huber, M. C. E., Noyes, R. W., Parkinson, W. H., and Reeves, E. M.: 1971, Solar Phys. 21, 272.
Withbroe, G. L. and Gurman, J. B.: 1973, Astrophys. J. 183, 270.
Withbroe, G. L. and Noyes, R. W.: 1971, Bull. Am. Astron. Soc. 3, 265.
Withbroe, G. L. and Wang, Y.: 1972, Solar Phys. 27, 394.
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Now at Dept. of Physics and Astrophysics, University of Colorado.
Operated by the Association of Universities for Research in Astronomy, Inc. under contract with the National Science Foundation.
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Gurman, J.B., Withbroe, G.L. & Harvey, J.W. A comparison of EUV spectroheliograms and photospheric magnetograms. Sol Phys 34, 105–111 (1974). https://doi.org/10.1007/BF00149602
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DOI: https://doi.org/10.1007/BF00149602