Astronomy and Astrophysics – Astrophysics
Scientific paper
Jun 1994
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994a%26a...286..639b&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 286, no. 2, p. 639-644
Astronomy and Astrophysics
Astrophysics
20
Calcium, Emission Spectra, Helium, Hydrogen, Iridium, Line Spectra, Solar Oscillations, Solar Prominences, Spatial Distribution, Temporal Distribution, Chromosphere, Power Spectra, Radial Velocity, Solar Atmosphere
Scientific paper
The emission lines He 3889 A, H8 and Ca(+)IR3 are observed simultaneously in a prominence over a total of 4 hours. The time variations of the He 3889/H8 emission ratio R, the thermal and the non-thermal line broadenings Tkin and xi respectively, are compared with those of the Doppler shift, vD for 10 spatial locations along the slit. The time-averaged spatial variations along the slit show an increase of R, Tkin, and xi with height related to a decrease of the H8 emission, Etot(H8), in agreement with other authors. The short-time fluctuations show that quasi-oscillations, known from Doppler shifts, also exist for other physical parameters. The long-term variations over the total of 4 hours indicate a smooth increase of R, Tkin, and xi at the upper parts of the prominence, resembling the known spatial behavior of these parameters at prominence edges. Also the well known anti-correlation of the emission ratio R and the Etot(H8) occurs in the long-term behavior. We suggest that the decrease of Etot(H8) parallel with the increase of R might be related to a dissolution of the prominence yielding a smaller density of fine-structures.
Balthasar Horst
Wiehr Eberhard
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