Astronomy and Astrophysics – Astrophysics
Scientific paper
Jul 1982
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982a%26a...111..136m&link_type=abstract
Astronomy and Astrophysics, vol. 111, no. 1, July 1982, p. 136-139.
Astronomy and Astrophysics
Astrophysics
13
Chromosphere, Mass Flow, Solar Activity, Solar Atmosphere, Solar Spectra, Carbon, Doppler Effect, H Alpha Line, Sunspots, Velocity Distribution
Scientific paper
A comparison is made between H-alpha and C IV observations of Active Region 2717 on October 9, 1980. On the basis of this comparison, it is found that upward velocities are present above sunspots in the chromosphere-corona transition zone (20 km/s). The downward velocities are found to be well correlated in both lines. Doppler-shift ratios between C IV and H-alpha levels (approximately 10) are seen to be much smaller than expected from density ratio estimates. The comparison is seen as suggesting that flow lines are probably far from vertical in the transition zone. It is pointed out, however, that this depends on model densities that may not be correct. A simple method for comparing matter flows is presented. The best fit between H-alpha and C IV levels is obtained when C IV Doppler shifts are multiplied by the line intensity to the power 0.5 (approximately) in order to make allowance for density fluctuations.
Mein Pierre
Shine Richard A.
Simon Gabor
Vial Jean-Claude
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