Penumbral oscillations in NA D lines

Details Penumbral oscillations in NA D lines Penumbral oscillations in NA D lines

Aug 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990ap%26ss.170...43m&link_type=abstract

(IAU, European Regional Astronomy Meeting, 11th, La Laguna, Spain, July 3-8, 1989) Astrophysics and Space Science (ISSN 0004-640

Astronomy and Astrophysics

Astrophysics

1

D Lines, Line Spectra, Penumbras, Solar Oscillations, Solar Spectra, Power Spectra, Sodium, Sunspots

Scientific paper

Penumbral oscillations were measured in two opposite parts in the penumbra of a spot, using photographic spectra of Na D lines. Power spectra of velocities show the presence of the 5-mm oscillation with low v(rms). Coherence and phase analyses between the velocity fluctuations of the lines are also studied. The results seem to show that the 5-mm oscillation is still surviving as a standing or evanescent wave at the height of formation of Na D lines.

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