Spectroscopic Studies of Limb Spicules. I. Radial and Turbulent Velocities - Astrophysics > Solar and Stellar AstrophysicsReport as inadecuate




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Abstract: We made high-resolution spectroscopic observations of limb-spicules inH-alpha using the Vertical Spectrograph of Domeless Solar Telescope at HidaObservatory. While more than half of the observed spicules have Gaussianline-profiles, some spicules have distinctly asymmetric profiles which can befitted with two Gaussian components. The faster of these components has radialvelocities of 10 - 40 km-s and Doppler-widths of about 0.4 A which suggest thatit is from a single spicule oriented nearly along the line-of-sight. Profilesof the slower components and the single-Gaussian type show very similarcharacteristics. Their radial velocities are less than 10 km-s and theDoppler-widths are 0.6 - 0.9 A. Non-thermal -macroturbulent- velocities oforder 30 km-s are required to explain these width-values.



Author: Makiko Shoji, Takara Nishikawa, Reizaburo Kitai, Satoru Ueno

Source: https://arxiv.org/







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