Suspended spicules associated with the enhanced bright network in an active region

Details Suspended spicules associated with the enhanced bright network in an active region Suspended spicules associated with the enhanced bright network in an active region

Jul 1984

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984soph...93..257g&link_type=abstract

Solar Physics (ISSN 0038-0938), vol. 93, July 1984, p. 257-268.

Physics

5

Chromosphere, H Alpha Line, Solar Activity, Solar Spectra, Spicules, Brightness Distribution, Emission Spectra, Faculae, Solar Limb

Scientific paper

The progressive rotation from the limb onto the disk of a long-lived cluster of coaligned H-alpha spicules was observed at high spatial resolution on the fringe of a large complex of activity. Although individual spicules were steadily changing, the organized cluster appeared consistently suspended above the photospheric limb when viewed in the wings of H-alpha (/Delta-lambda/ of about 0.9 A). The phenomenon is the counterpart near an active region of the dark band discovered in the quiet low chromosphere by Loughhead (1969). But in the present circumstances the effect is perceived as a weakening of emission, i.e. as a gap rather than an obscuration. The initial gap between the off-band spicules and the photospheric limb narrowed and closed in about 4 h. A day later, the cluster of spicules could be identified at the same wavelength with a cluster of elongated dark mottles, similarly coaligned; they were adjacent to, but not in contact with, a foreshortened patch of faculae. The persistence of the gap in this cluster, and its occurrence in isolated spicules reported here in quiet regions, imply that the phenomenon is an inherent property of spicules. It is proposed that the gap results from a spicule-generating process initiated above the temperature minimum.

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