Observations of f- and p-mode oscillations of high degree (500 is less than L is less than 2500) in quiet and active Sun

Details Observations of f- and p-mode oscillations of high degree (500 is less than L is less than 2500) in quiet and active Sun Observations of f- and p-mode oscillations of high degree (500 is less than L is less than 2500) in quiet and active Sun

Dec 1988

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988esasp.286..315t&link_type=abstract

In ESA, Seismology of the Sun and Sun-Like Stars p 315-319 (SEE N89-25819 19-92)

Astronomy and Astrophysics

Astronomy

16

Astronomical Spectroscopy, P Waves, Solar Activity Effects, Solar Observatories, Solar Oscillations, Fourier Analysis, Solar Spectra, Velocity Distribution

Scientific paper

Spectra (l - v diagrams) from high resolution observations taken at the Vacuum Tower Telescope (NSO/Sunspot) are presented. The raw data are CCD images taken through the SOUP narrowband filter in Fe I 5576 A. Four filtergrams spaced through the spectral line are combined to form velocity movies. Spectra for 80 min of data with 0.5 to 1.5 arcsec resolution are presented for the entire field-of-view and for quiet and magnetic (plage) subregions. Ridges f and p1 to p5 are evident in velocity spectra, extending to l = 2500 (f), l = 1800 (p1), and l = 1200 (p2). Much less power is seen in the magnetic region than in the quiet Sun. Three-dimensional Fourier filtering shows that oscillation velocity amplitude drops sharply at the boundary of the active region for each family of modes considered.

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