Local 5-min oscillations above solar granules and intergranular space

Details Local 5-min oscillations above solar granules and intergranular space Local 5-min oscillations above solar granules and intergranular space

Oct 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999astl...25..678k&link_type=abstract

Astronomy Letters, Volume 25, Issue 10, October 1999, pp.678-687

Astronomy and Astrophysics

Astronomy

6

Scientific paper

A time series of granulation spectral images with high spatial (less than 0.5 arcsec) and temporal (9.3 s) resolutions has been obtained with the German vacuum tower telescope (VTT) on the Canary Islands in an effort to study the local 5-min solar oscillations. Observations were carried out with a CCD array in the FeI lambda 532.4185-nm line.The 5-min intensity and velocity fluctuations near the temperature minimum, where this line originates, are shown to respond differently to the fine photospheric structure. The most energetic velocity fluctuations occur above the regions where the convective velocities are at a maximum; the main power of the velocity fluctuations above granules concentrates at lower frequencies than that in integranular space. The amplitude of the intensity fluctuations in the lambda 532.4185-nm emission above granules is, on the average, approximately a factor of 2 smaller.

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