Five-minute oscillations and fine structure of the solar photosphere. II.

Details Five-minute oscillations and fine structure of the solar photosphere. II. Five-minute oscillations and fine structure of the solar photosphere. II.

Apr 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999kfnt...15..135k&link_type=abstract

Kinematika Fiz. Nebesn. Tel, Tom 15, No. 2, p. 135 - 144

Physics

Solar Photosphere: Solar Oscillations, Solar Photosphere: Fine Structure, Solar Photosphere: Line Profiles

Scientific paper

The evolution of spectra of the solar Fe I λ 532.4185 nm line averaged statistically over granules and intergranules of different brightness are studied. The observations were carried out with the Vacuum Tower Telescope at the Observatorio del Teide, Tenerife. The response to the fine structure of the lower photosphere turns out to be clearly different for the five minute oscillations of the velocity and the intensity observed in such spectra. The amplitudes of line intensity oscillations above intergranular lanes are nearly two times larger than over granules. The power spectrum of intensity oscillations is dominated by high-frequency oscillations, while the velocity oscillations gain power in the low-frequency band. The amplitudes of the velocity oscillations over granules and intergranules of the same brightness contrast are virtually equal. The most energetic velocity oscillations are shown to occur over areas where the largest convective velocities are observed.

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