Physics
Scientific paper
Jun 1980
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1980soph...66..251k&link_type=abstract
Solar Physics, vol. 66, June 1980, p. 251-258.
Physics
7
Atmospheric Composition, Chromosphere, Dynamic Characteristics, H Alpha Line, Solar Spectra, Spicules, Radial Velocity, Solar Atmosphere, Solar Physics, Spectral Line Width
Scientific paper
Almost simultaneous height sequences of 69 spicules in the Hα line have been studied. The spectra are obtained at six heights during 6 s on the east side of the solar disk with the 53-cm Lyot coronagraph of Abastumani Astrophysical Observatory.
Radial velocities Vr total intensities or equivalent widths W, full widths at half maximum of intensity (FWHM) at all heights are determined (about 300 profiles of the Hα line). It is found that:
(1) Absolute values of radial velocities increase linearly with the height (see Equation (1));
(2) variation of the sign of the radial velocity along single spicules was never observed.
These results combined with the findings on the spicules radial velocities and shifts obtained earlier (Kulidzanishvili and Nikolsky, 1978; Nikoisky and Platova, 1970) led us to the conclusion that the 5-mm tangential oscillations of spicules involve the entire spicule at once.
The intensity height scales for single spicules and for the chromosphere "in toto" are determined; they turned out to be 2.5 × 103 km and 1.9 × 103 km respectively (see Equations (2) and (3)).
The dependence curve of the Hα line half-widths Δλ on the height h is drawn. The Hα line half-width for those spicule groups which are traced at all heights (10 spicules) decreases with the height (Figure 4); for the majority (∼60 spicules) it remains essentially constant. Non-thermal "turbulent" velocities Vr in Hα spicules are defined. A mean value of the `turbulent' velocity Vr at T = 6000° appeared to be 20- 30 km s-1.
The hydrogen concentration in the spicules at 5000 km is 6 × 1011 cm-3.
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