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- Title
The Fe IX Line at 17.1 nm in the Radiation Spectrum of Slow Magneto-Acoustic Waves Propagating in the Solar Corona.
- Authors
Mamedov, S. G.; Aliyeva, Z. F.; Alisheva, K. I.
- Abstract
Profiles of the Fe IX line at a wavelength of λ = 17.1 nm in the radiation spectrum of slow magneto-acoustic waves, propagating in coronal loops, are calculated under conditions of an optically thin layer and a constant density. The parameter values used in calculations of the line profiles are as follows: the amplitude of the velocity of particles' displacements in a wave v0 = 10 km/s, the width of the coronal loop is 2000 and 5000 km, the wavelength Λ = 20 000 km and 50 000 km, and the value of the Doppler width Δλd = 1 pm; the values for the angle of view and the wave phases were varied. The true value of the energy flux density is 622 erg/cm2s. The values of the energy flux density obtained in calculations strongly depend on the angle of view θ and the wave phase: they range from 0 and, when the values of θ are large, to 2000 erg/cm2s. The values of the Doppler velocities vd and the velocities of nonthermal motions vnt take maximal values of ~12 km/s at small angles θ and almost vanish at large angles θ. When the angle of view is small (θ < 30°), a weak blue asymmetry is noticeable. When the angle of view is large (θ > 30°), the asymmetry is almost invisible.
- Subjects
SOLAR corona; ELECTROMAGNETIC spectrum; SOLAR atmosphere; MAGNETOHYDRODYNAMIC waves; ACTINIC flux; ENERGY density
- Publication
Kinematics & Physics of Celestial Bodies, 2021, Vol 37, Issue 6, p300
- ISSN
0884-5913
- Publication type
Article
- DOI
10.3103/S0884591321060064