Astronomy and Astrophysics – Astrophysics
Scientific paper
May 1980
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1980a%26a....85..326e&link_type=abstract
Astronomy and Astrophysics, vol. 85, no. 3, May 1980, p. 326-328.
Astronomy and Astrophysics
Astrophysics
8
Calcium, K Lines, Solar Prominences, Solar Spectra, High Resolution, Histograms, Solar Magnetic Field, Spectral Line Width
Scientific paper
A series of 17 spectrograms of the Ca+ K line in a large quiescent prominence are investigated for the effects of spatial smearing due to seeing. It is found that the full width at half- maximum (FWHM) decreases from 0.190 Å to 0.125 Å when the spatial resolution increases from 15" to about 2". High spatial resolution also facilitates the detection of large line shifts Δλ. The narrowest line profiles - which are detected in the case of high spatial resolution and large shift - yield FWHMmin ≍ 0.090 Å, which exceeds the pure thermal broadening width by a factor of 2-3. The most probable value of the resolved macroscopic velocity is found to be 23 km s-1. This velocity corresponds to an equipartition magnetic field strength of about 3.8 G.
Engvold Odbjørn
Wiehr Eberhard
Wittmann Axel
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