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

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

Feb 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999kfnt...15...25k&link_type=abstract

Kinematika Fiz. Nebesn. Tel, Tom 15, No. 1, p. 25 - 37

Computer Science

2

Solar Photosphere: Fine Structure, Solar Photosphere: Solar Granulation

Scientific paper

The authors analyse the spatial relationship between the solar granulation and the local five-minute oscillations of velocity and intensity observed in the Fe I λ532.4185 nm line. The time series of CCD spectral images of solar granulation taken at the Germany Vacuum Tower Telescope (VTT) were recorded with high spatial (<0.5 arcsec) and temporal (9.3 s) resolution. In the temperature minimum region, where the line is formed, the most energetic intensity oscillations are shown to occur mainly over dark intergranular lanes, while strong velocity oscillations are observed over granules and intergranules. The amplitude of the latter oscillations increases with the granulation brightness contrast. The spatially averaged power of intensity oscillations is concentrated at higher frequencies compared to the power of velocity oscillations.

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