Astronomy and Astrophysics – Astrophysics
Scientific paper
Aug 1984
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984apj...283l..75s&link_type=abstract
Astrophysical Journal, Part 2 - Letters to the Editor (ISSN 0004-637X), vol. 283, Aug. 15, 1984, p. L75-L77.
Astronomy and Astrophysics
Astrophysics
11
Chromosphere, Solar Spectra, Spicules, H Alpha Line, Propagation Velocity, Temporal Distribution
Scientific paper
The vacuum telescope of the National Solar Observatory, Sacramento Peak was used to obtain H-alpha spectral observations of spicules. A set of spectra corresponding to five slit positions above the solar limb were recorded every 8 s in order to study the temporal variation of spicules at several heights with high space and time resolution. The short time interval (less than 2 s) between exposures at each height is a new feature of these observations. A typical flow event in a spicule was found to last 10-15 minutes. During this period the velocity did not reverse sign. The temporal behavior of the velocity at different heights in a spicule appeared to show a high correlation, with a time lag less than 7 s, implying signal propagation speeds greater than 300 km/s. Finally, no significant variation of spicule velocity with height in the chromosphere was noticed.
Hasan Sirajul S.
Keil Stephen L.
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