Contents

Astronomy Reports

Vol. 64, No. 1, 2020

Evolution of a Viscous Protoplanetary Disk with Convectively Unstable Regions

Ya. N. Pavlyuchenkov, A. V. Tutukov, L. A. Maksimova, and E. I. Vorobyov p. 1  abstract

Structure and Evolution of Powerful H2O Maser Flares in the Protostellar Object IRAS 18316–0602 (G25.65+1.05)

N. T. Ashimbaeva, V. V. Krasnov, E. E. Lekht, M. I. Pashchenko, G. M. Rudnitskii, and A. M. Tolmachev p. 15  abstract

The Herbig Be Star IL Cep A as a Long-Periodic Spectroscopic Binary

N. Z. Ismailov, M. A. Pogodin, U. Z. Bashirova, and G. R. Bahaddinova p. 23  abstract

Analysis of the Sky Scanning Efficiency in the Lyra-B Space Experiment

S. V. Zhmailov and M. E. Prokhorov p. 34  abstract

X-Ray Flares and Activity Complexes on the Sun in Solar Cycle 24

E. S. Isaeva, V. M. Tomozov, and S. A. Yazev p. 58  abstract

Corotating and Propagating Disturbances in the Solar Wind Based on Monitoring of Interplanetary Scintillations at the LPA Radio Telescope of the Lebedev Physical Institute in 2017

I. V. Chashei, T. O. Lebedeva, S. A. Tyul’bashev, and I. A. Subaev p. 66  abstract

Computation of Periodic Orbits around L1 and L2 using PSO Technique

V. Kumar and B. S. Kushvah p. 82  abstract

First Space and Kinematical Analysis of Newly Discovered Southern UFMGs Clusters with Gaia

W. H. Elsanhoury p. 94  abstract