Abstract
Observations of the equatorialK-coronal radiance at 2.5R ⊙ from Sun center and its variation with time, on a daily basis, during the Skylab mission (May 1973–February 1974) are presented. The observations are subdivided into three periods, each characterized by a different variation of the radiance pattern with time. During the initial period, encompassing two solar rotations, there are several data gaps, but the radiance pattern shows a more or less smooth variation with time; however, during the second period (also about two solar rotations duration) the radiance signal is neither persistent on the short term nor recurrent from one limb passage to the next. Finally, during the last period, of five solar rotations duration, the radiance signal exhibits an orderly periodic behavior of increasing intensity. These results are interpreted as indicating a general simplification of the coronal magnetic field through the mission and, in comparison with harmonic analysis of the surface magnetic field (Levine, 1977), as indicating a rapid response of equatorial outer coronal structures to abrupt changes in the global surface field structure.
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Altschuler, M. D. and Newkirk, G.: 1969,Solar Phys. 9, 131.
Bohlin, J. D.: 1970a,Solar Phys. 12, 240.
Bohlin, J. D.: 1970b,Solar Phys. 13, 153.
Csoeke-Poeckh, A., MacQueen, R. M., and Poland, A. I.: 1977,Appl. Opt. 16, 931.
Dulk, G. A., Smerd, S. F., MacQueen, R. M., Gosling, J. T., Magun, A., Stewart, R. T., Sheridan, K. V., Robinson, R. D., and Jacques, S.: 1976,Solar Phys. 49, 369.
Gilman, P. A.: 1977,Proceedings of First Skylab Solar Workshop, University of Colorado Press, Boulder.
Gosling, J. T., Hildner, E., MacQueen, R. M., Munro, R. H., Poland, A. I., and Ross, C. L.: 1974,J. Geophys. Res. 79, 4581.
Gosling, J. T., Hildner, E., MacQueen, R. M., Munro, R. H., Poland, A. I., and Ross, C. L.: 1975,Solar Phys. 40, 439.
Gosling, J. T., Hildner, E., MacQueen, R. M., Munro, R. H., Poland, A. I., and Ross, C. L.: 1976,Solar Phys. 48, 389.
Hansen, R. T., Garcia, C. J., Hansen, S. F., and Loomis, H. G.: 1969,Solar Phys. 7, 417.
Hansen, R. T., Hansen, S. F., Garcia, C. J., and Trotter, D. E.: 1971,Solar Phys. 18, 271.
Hansen, R. T., Hansen, S. F., and Sawyer, C.: 1976,Planetary Space Sci. 24, 381.
Hansen, S. F., Hansen, R. F., and Garcia, C. J.: 1972,Solar Phys. 26, 202.
Hildner, E., Gosling, J. T., MacQueen, R. M., Munro, R. H., Poland, A. I., and Ross, C. L.: 1975a,Solar Phys. 42, 163.
Hildner, E., Gosling, J. T., Hansen, R. T., and Bohlin, J. D.: 1975b,Solar Phys. 45, 363.
Hildner, E., Gosling, J. T., MacQueen, R. M., Munro, R. H., Poland, A. I., and Ross, C. L.: 1976,Solar Phys. 48, 127.
Howard, R. A. and Koomen, M. J.: 1974,Solar Phys. 37, 469.
Howard, R. A., Koomen, M. J., Michels, D. J., Tousey, R., Detwiler, C. R., Roberts, D. E., Seal, R. T., Whitney, J. D., Hansen, R. T., Hansen, S. F., Garcia, C. J., and Yasukawa, E.: 1975,Synoptic Observations of the Solar Corona during Carrington Rotations 1580–1596, World Data Center A Report UAG-48, National Oceanic and Atmospheric Administration.
Hundhausen, A. J.: 1977,Proceedings of First Skylab Workshop, University of Colorado Press, Boulder.
Levine, R. H.: 1977,Solar Phys., in press.
MacQueen, R. M., Gosling, J. T., Hildner, E., Munro, R. H., Poland, A. I., and Ross, C. L.: 1974,Proc. Soc. Photo-Optical Inst. Eng. 44, 207.
MacQueen, R. M., Gosling, J. T., Hildner, E., Munro, R. H., Poland, A. I., and Ross, C. L.: 1976,Phil. Trans. Roy. Soc. London 281, 405.
National Oceanic and Atmospheric Administration Solar Geophysical Data: 1974.
Nolte, J. T., Krieger, A. S., Timothy, A. F., Gold, R. F., Roelof, E. C., Vaiana, G., Lazarus, A. J., Sullivan, J. D., and McIntosh, P. S.: 1976,Solar Phys. 46, 303.
Poland, A. I. and Munro, R. H.: 1976,Astrophys. J. 209, 927.
Poland, A. I.: 1977,Solar Phys., (in preparation).
Poland, A. I., Gosling, J. T., MacQueen, R. M., and Munro, R. H.: 1977,Appl. Opt. 16, 926.
Rust, D. and Hildner, E.: 1976,Solar Phys. 48, 381.
Saito, K., Poland, A. I., and Munro, R. H.: 1977, this issue, p. 121.
Solodyna, C. V., Nolte, J. T., and Krieger, A. S.: 1975, Memorandum to Skylab Solar Workshop participants.
Stix, M.: 1977,Astron. Astrophys., (in press).
Svalgaard, L.: 1975, SUIPR Report No. 629, Institute for Plasma Research, Stanford University, Stanford, California.
Van de Hulst, H. C.: 1953, in Kuiper (ed.),The Sun, Univ. of Chicago Press, Chicago, p. 284.
Wilson, D. C.: 1976, Thesis, University of Colorado.
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The National Center for Atmospheric Research is sponsored by the National Science Foundation.
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MacQueen, R.M., Poland, A.I. Temporal evolution of the equatorialK-corona. Sol Phys 55, 143–159 (1977). https://doi.org/10.1007/BF00150881
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DOI: https://doi.org/10.1007/BF00150881