Granulation and five-minute oscillations

Details Granulation and five-minute oscillations Granulation and five-minute oscillations

Sep 2000

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000kfnts...3..431k&link_type=abstract

Kinematika i Fizika Nebesnykh Tel, Suppl, no. 3, p. 431-436

Physics

Scientific paper

We discuss the links between the photospheric 5-min oscillations and granulation patterns using a 30-min time series of CCD spectral images of solar granulation recorded with high spatial (0.5'') and temporal (9.3 s) resolution. The observed images contain Fe I 5324 Å line. Our observations and theoretical modeling lead to the similar results: (i) period of oscillations varies above granules and lanes; (ii) amplitudes of the velocity oscillations grow with the contrast of granulation. Amplitudes of the intensity oscillations are larger in intergranular lanes than in granules. Our simple model describes the basic features of the oscillations above granules and intergranular lanes. We conclude that differences in these oscillations are caused mainly by variations of the physical conditions in these structures.

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