Filter observations of prominences in the D3 and Hα lines |
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Authors: | I S Kim G M Nikolsky |
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Institution: | (1) The Solar-Activity Laboratory, Institute of Terrestrial Magnetism, Ionosphere and Radiowave Propagation, Academy of Sciences of U.S.S.R., U.S.S.R. |
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Abstract: | D3 and H pictures of prominences were obtained with a 21-in. Lyot coronograph and a Fabry-Perot etalon used as a narrow band filter. The monochromatic images of quiescent, quasiquiescent and loop-prominences were studied. The comparison of the isophotes of quiescent and quasi-quiescent prominences in D3 with those in H shows the similarity of the prominence structure at both wavelength, although there is a strong tendency for an increase in the intensity ratio D3/H in the upper region of prominences. It seems that it is due to lower temperature in the upper regions of prominences. Probably, the relaxation processes establishing ionization equilibrium play some role. Measurements of the knot intensities of the loop-prominence show strong variations of the intensity ratio D3/H (more than one order of magnitude). |
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