The properties of velocity oscillations in vicinities of sunspot penumbra

Details The properties of velocity oscillations in vicinities of sunspot penumbra The properties of velocity oscillations in vicinities of sunspot penumbra

Sep 2000

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000soph..196..129k&link_type=abstract

Solar Physics, v. 196, Issue 1, p. 129-135 (2000).

Physics

4

Scientific paper

It is suggested that the problem of the extent of the outer penumbra could be considered by investigating the range over which the influence of the penumbra on the oscillation regime of the surrounding medium extends. In summer 1998, velocity oscillations were observed in the vicinities of the penumbra of the NOAA 8263 sunspot. The observations were carried out in the Hβ line (chromosphere) and in the far wing of Nii 4857.2 Å (lower photosphere) simultaneously. The oscillation regime typical for sunspot penumbrae is observed within distances of about 15^'' from the visible outer boundary of the penumbra.

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