# Izv. Sarat. Univ. Physics, 2021, vol. 21, iss. 2

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## Content

### Theoretical and mathematical physics

Stepanov E. A., Mayorov A. O., Romanov K. V., Romanov D. V., Romanov V. A.
Mathematical modeling of the Parker’s instability development of large-scale vibrations of magnetic fields in the sun convective zone
106

### Radiophysics, electronics, acoustics

Gorshkov I. B., Petrov V. V.
Numerical simulation of stages number influence to the characteristics of a looped tube thermoacoustic Stirling engine
133

### Optics and spectroscopy. Laser physics

Zimnyakov D. A., Volchkov S. S., Kochkurov L. A., Dorogov A. F., Tokarev A. S., Nikiforov A. A., Markova N. S.
The effect of radiation losses in localized fluorescence upon laser pumping of fluorescent random media
145

Dobdin S. Y., Dzhafarov A. V., Shchedrinov M. P., Inkin M. G., Skripal A. V.
Nanodisplacement measurements by frequency-modulated laser autodyne
157

### Biophysics and medical physics

Doubrovski V. A., Markov S. V., Kovalev D. G.
Red blood cells sedimentation as a collective process – experimental and theoretical modeling
165

Zyuryukina O. A., Sinichkin Y. P.
Features of the dynamics of the optical and physiological properties of muscle tissue in vitro during its compression
178