Spectroscopic Studies of Limb Spicules. I. Radial and Turbulent Velocities

Details Spectroscopic Studies of Limb Spicules. I. Radial and Turbulent Velocities Spectroscopic Studies of Limb Spicules. I. Radial and Turbulent Velocities

2010-02-19

arxiv.org/abs/1002.3656v1

Astronomy and Astrophysics

Astrophysics

Solar and Stellar Astrophysics

13 pages, 12 figures, to be published in Publications of the Astronomical Society of Japan

Scientific paper

We made high-resolution spectroscopic observations of limb-spicules in H-alpha using the Vertical Spectrograph of Domeless Solar Telescope at Hida Observatory. While more than half of the observed spicules have Gaussian line-profiles, some spicules have distinctly asymmetric profiles which can be fitted with two Gaussian components. The faster of these components has radial velocities of 10 - 40 km/s and Doppler-widths of about 0.4 A which suggest that it is from a single spicule oriented nearly along the line-of-sight. Profiles of the slower components and the single-Gaussian type show very similar characteristics. Their radial velocities are less than 10 km/s and the Doppler-widths are 0.6 - 0.9 A. Non-thermal "macroturbulent" velocities of order 30 km/s are required to explain these width-values.

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