Photospheric oscillations. IV - an accurate omega-spectrum at low values of K

Details Photospheric oscillations. IV - an accurate omega-spectrum at low values of K Photospheric oscillations. IV - an accurate omega-spectrum at low values of K

Aug 1977

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1977a%26a....60..151f&link_type=abstract

Astronomy and Astrophysics, vol. 60, no. 1, Aug. 1977, p. 151, 152.

Astronomy and Astrophysics

Astrophysics

1

Oscillations, Photosphere, Power Spectra, Solar Atmosphere, Bandwidth, Frequency Response, Solar Spectra

Scientific paper

Two spatiotemporal (k - omega) power spectra of the solar five-minute oscillation are calculated with a resolution of 0.3 mHz for an 8.5-ft and a 36-in. aperture, respectively. The two spectra are found to appear almost identical except in the low-frequency range, where differences arise due to large amounts of atmospheric noise. An average omega-spectrum is determined from the two power spectra and is compared with a previously computed power spectrum. It is concluded that for wavenumbers (k) not exceeding 0.0001 per km, the dependence of the unresolved omega-spectrum on wavenumber is fairly weak and that the average of the two spatiotemporal power spectra can be regarded as a good estimate of the unresolved omega-spectrum for any wavenumber bandwidth in the range from 0 to 0.0001 per km.

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