Astronomy and Astrophysics – Astrophysics
Scientific paper
Aug 1985
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985a%26a...149..217w&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 149, no. 1, Aug. 1985, p. 217-220.
Astronomy and Astrophysics
Astrophysics
30
Abundance, Periodic Variations, Solar Spectra, Spatial Distribution, Temporal Distribution, Zeeman Effect, Calcium, Circular Polarization, Line Spectra, Potassium, Radiant Flux Density, Red Shift, Spectral Energy Distribution, Spectrum Analysis
Scientific paper
Simultaneous wavelength scans (Delta lambda = 1 A; Delta t = 10 s) of the circular Zeeman profile, Stokes-V, and of the intensity profile, Stokes-I, are performed in isolated Ca(+) K features near solar disc center for the large split line Fe 8468.4 (g = 2.5; chi-ex = 2.2 eV; W(lambda) = 128 mA). It is found that the V-profiles are always redshifted with respect to the I-profiles indicating a downdraft equal to or less than 2 km/s inside the flux-tube with respect to its non-magnetic surroundings. Both this redshift as well as the known asymmetry of the V-profiles is found to vary largely between the 12 structures observed. Repeated lambda-scans in one selected Ca(+) K feature show large time variation of asymmetry and redshift of the V-profile in the sense of a decrease of both quantities within a few minutes. This might be a first hint for the existence of a convective instability. Simultaneous Doppler measurements of the line flanks (I-profile) and of the inversion point V = 0 show that the V-profile participates on the photospheric 5 min oscillation.
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