Studies of K line filtergrams

Details Studies of K line filtergrams Studies of K line filtergrams

Sep 1974

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1974soph...38...91z&link_type=abstract

Solar Physics, vol. 38, Sept. 1974, p. 91-108.

Physics

16

Chromosphere, Filtergrams, K Lines, Solar Spectra, Spectroheliographs, Fine Structure, H Alpha Line, Optical Filters, Solar Activity, Solar Atmosphere, Solar Flares, Solar Granulation

Scientific paper

The paper describes the material obtained on a Lyot filter for K at the Big Bear Solar Observatory. This material is compared with simultaneous H-alpha observations. K-line filtergrams are used to interpret K-line double reversal. The structure of the general chromosphere is discussed. It is found that the absorption of the cool clouds of the chromosphere, covering about one third of the area inside the cells, oscillating rapidly, and having a vertical extent around 3000 km, is not clearly seen in K3. In active regions K is close to H-alpha. Here all plagettes and plages are bounded by systems of strongly inclined bright and dark fibrils. Umbral flashes are found to be less visible in H-alpha, except that the running penumbral waves are bright in K and dark in H-alpha.

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