Astronomy and Astrophysics – Astrophysics
Scientific paper
Jun 1992
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992a%26a...259..307b&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 259, no. 1, p. 307-312.
Astronomy and Astrophysics
Astrophysics
43
Gas Flow, H Alpha Line, Photosphere, Spectrograms, Sunspots, High Resolution, Magnesium, Solar Magnetic Field
Scientific paper
Observations with high spatial resolution of the Evershed effect in a sunspot near the limb are presented. They were obtained with the Gregory Coude Telescope at Observatorio del Teide, Tenerife, and consist of photographic spectrograms in the wavelength region 5160-5180A and corresponding slit-jaw images in white light at various positions of the sunspot image on the slit of the spectrograph. The measurement of the velocity field covers a height range of approximately 100 km to 700 km in the Mg b2 line. The Evershed flow is inhomogeneous at all heights, though decreasing in amplitude with increasing height. We find maximum velocities of 4 km/s at the lowest layer. The flow goes clearly beyond the outer penumbra border. In Mg b2 the Evershed effect is inverse, on average, while at the 500 km level it is not. We suggest that in one fortunate case, with slit orientation parallel to a flow tube, we see siphon flows outward, reaching to the height of the Mg b2 layer and ending in photospheric faculae. The stationarity of the flow on small scales is questioned.
Boerner Paul
Kneer Franz
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