Processes observable in the photosphere during the formation of an active region. II - Development of a usual active region; growth of a SPOT penumbra

Details Processes observable in the photosphere during the formation of an active region. II - Development of a usual active region; growth of a SPOT penumbra Processes observable in the photosphere during the formation of an active region. II - Development of a usual active region; growth of a SPOT penumbra

Mar 1984

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984baicz..35...28b&link_type=abstract

Astronomical Institutes of Czechoslovakia, Bulletin (ISSN 0004-6248), vol. 35, no. 1, 1984, p. 28-39.

Astronomy and Astrophysics

Astronomy

18

Chromosphere, Photosphere, Solar Activity, H Alpha Line, Penumbras, Photographs, Solar Magnetic Field, Solar Rotation, Sunspots, Umbras

Scientific paper

All processes visible during the development of the magnetic field, sunspots and chromospheric structures in the usual active region of August 1974 are studied. The connection of the active region with the dynamics of the background field is discussed. The formation of a "centre of magnetic activity" is demonstrated on magnetic charts as well as in photospheric and chromospheric details. The regularities in the active region's magnetic field topology and dynamics, and their relations to the sunspot group development and formation of individual sunspots are shown. The process of formation of a penumbra is described.

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