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Naked sunspots

Liggett, Margaret and Zirin, Harold (1983) Naked sunspots. Solar Physics, 84 (1-2). pp. 3-11. ISSN 0038-0938. doi:10.1007/bf00157438.

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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.

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Additional Information:© 1983 Kluwer Academic Publishers. Provided by the NASA Astrophysics Data System. Received 28 May 1982; Revised 09 December 1982. We are indebted to Dr J. W. Harvey (KPNO) for patiently helping us to go through his data, and to Drs R. Howard (Mt. Wilson), A. Krieger (AS&E), and J. B. Zirker (SPO) for furnishing their data. This work was supported by AFOSR under grant 82-0018, by the NSF Solar Terrestrial Program under grant ATM-8112698 and by NASA under NGL 05-002-034.
Funding AgencyGrant Number
Air Force Office of Scientific Research (AFOSR)82-0018
NASANGL 05-002-034
Subject Keywords:Magnetic Field; Rotation Rate; Opposite Polarity; Coronal Hole; Magnetic Polarity
Issue or Number:1-2
Record Number:CaltechAUTHORS:20200603-142557815
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Official Citation:Liggett, M., Zirin, H. Naked sunspots. Sol Phys 84, 3–11 (1983).
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:103680
Deposited By: Tony Diaz
Deposited On:03 Jun 2020 21:48
Last Modified:16 Nov 2021 18:23

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