D3 spicules and the lower chromosphere

Details D3 spicules and the lower chromosphere D3 spicules and the lower chromosphere

Mar 1978

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1978soph...57...37m&link_type=abstract

Solar Physics, vol. 57, Mar. 1978, p. 37-48.

Physics

5

Chromosphere, D Lines, H Alpha Line, Solar Spectra, Spicules, Emission Spectra, Filtergrams, Helium, Photoionization

Scientific paper

High resolution filtergrams of the solar limb in D3 and off-band H-alpha have been used to investigate the spatial structure of the D3 chromosphere. It was found that spicules provide the major contribution to the intensity of the D3 emission band observed above the limb, with the remainder of the emission coming from a semi-homogeneous background component at low heights. The observations can be understood on the basis of the photoionization model, whereby it is found that helium is only slightly ionized at the height of peak intensity in the D3 emission band, and that spicules are at least three times denser than their surroundings at this height. In coronal holes, the D3 emission is confined to isolated emission patches, and these patches contain a fine structure resembling normal chromospheric spicules.

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