Abstract
Naked sunspots are spots seen in Hα to be devoid of associated plage. In magnetograms and K-line little if any opposite polarity field is found, and in soft X-ray images a blank appears in the region of the spot. In almost all cases studied in which naked spots resulted the spot groups had emerged in unipolar regions of the same polarity as the naked spot. At least half of the naked spots are associated with coronal holes. The naked spots are long-lived and show rotation rates close to the Newton-Nunn curve. Most of the naked spots had bright rims in Hα, and the one spot observed to disappear left no trace in the background magnetic field. These spots may be a means by which separation of p from f magnetic polarity occurs.
Similar content being viewed by others
References
Leighton, R. B.: 1969, Astrophys. J. 156, 1.
Marsh, K. A.: 1978, Solar Phys. 59, 105.
Mosher, J. M.: 1977, Thesis, California Institute of Technology.
Newton, H. W. and Nunn, M. L.: 1951, Monthly Notices Roy. Astron. Soc. 111, 413.
Prata, S. W.: 1973, Solar Phys. 33, 119.
Wallenhorst, S. G. and Howard, R.: 1982, Solar Phys. 76, 203.
Wallenhorst, S. G. and Topka, K. P.: 1982, Solar Phys. 81, 33.
Webb, D. F. and Zirin, H.: 1981, Solar Phys. 69, 99.
Author information
Authors and Affiliations
Rights and permissions
About this article
Cite this article
Liggett, M., Zirin, H. Naked sunspots. Sol Phys 84, 3–11 (1983). https://doi.org/10.1007/BF00157438
Received:
Revised:
Issue Date:
DOI: https://doi.org/10.1007/BF00157438