Meso-scale structures: an oscillatory phenomenon?
Abstract
A 20 minutes time sequence of simultaneous filtergrams taken in the blue peak of the Ca II K line and magnetic field maps taken in the photospheric line Fe 6302.5 Å is used to investigate the phase coherence of the 3 - 5 minutes oscillation. The extent of the coherence eddies in the calcium line is typically 8 Mm (11 arcsec) which is comparable to the dimension of the "mesogranulation" observed by November et al. (1979). The extension of this phase coherence of the oscillatory wavefront is only slightly influenced by the period of the wave in the 3 - 5 minutes range. The same analysis done on the magnetic field gives a totally different picture with an extended phase coherence on active regions superimposed to a "noisy background".
- Publication:
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Max Planck Institut fur Astrophysik Report
- Pub Date:
- 1985
- Bibcode:
- 1985MPARp.212..244D
- Keywords:
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- Solar Oscillations