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Arch filaments associated with the formation of sunspots by umbral merging

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Abstract

The formation of a sunspot during the emergence of a new group is described. The spot forms from a cluster of small umbrae that do not converge. Rather, the individual umbrae enlarge and merge into a spot covering the same area. The formation of each umbra is accompanied by an intensification of the arch filament anchored in it. The formation of the sunspot produces no apparent change in the total field.

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Authors and Affiliations

  1. Big Bear Solar Observatory, California Institute of Technology, 91125, Pasadena, CA, U.S.A.

    Harold Zirin

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  1. Harold Zirin
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Zirin, H. Arch filaments associated with the formation of sunspots by umbral merging. Sol Phys 114, 239–244 (1987). https://doi.org/10.1007/BF00167343

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  • DOI: https://doi.org/10.1007/BF00167343

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