Line widths and Doppler velocities according to the Fe X [lambda]6374 and Fe XIV [lambda]5303 observations performed with the Large Coronograph at Sayan Observatory

• Published in: Geomagnetism and Aeronomy 2014-12, Vol.54 (7), p.959
• Main Author: Tyagun, N F
• Format: Article
• Language: English
• Subjects: Corona; Magnetic fields; Solar physics; Topology
• ISSN: 0016-7932; 0016-7940
• DOI: 10.1134/S0016793214070159

Issue Title: Special issue: English Translation of selected articles from Solnechnaya i Solnechno-Zemnaya Fizika Distributions of the Doppler velocities (V), widths (Δ[lambda]), and intensities (W) have been obtained based on the [lambda]6374 and [lambda]5303 spectra observed with the Large Coronograph at Sayan Observatory above active regions and their surroundings. The average Doppler velocities in both lines are ±5 km/s; a decrease and stabilization of these velocities with increasing W demonstrate the effect of magnetic fields. The dispersion of V for [lambda]6374 in the zones with decreased W is substantially larger than such a dispersion for [lambda]5303, the Δ[lambda] values are larger in these zones respectively. This is explained by the fact that the profile shape is affected by the plasma structuring degree along the line of sight controlled by the magnetic field topology in the regions where these lines glow: the field should be open and closed in the red and green coronas, respectively.[PUBLICATION ABSTRACT]