Vol. 63, No. 7, 2023

Geomagnetism and Aeronomy

Ground-Based Observations of the Sun for Space Weather Forecasting

A. G. Tlatov and A. A. Pevtsov p. 863 abstract

Derivation of the Basic Magnetohydrodynamic Dynamo Equations Obtained by the Vector Potential Averaging in a Time Short-Correlated Turbulence

R. R. Allahverdiyev, E. V. Yushkov and D. D. Sokoloff p. 882 abstract

On the Efficiency of Radio Emissions at the Double Plasma Frequency in the Magnetosphere of Exoplanet HD189733b

V. V. Zaitsev, V. E. Shaposhnikov, M. L. Khodachenko and M. S. Rumenskikh p. 892 abstract

The Influence of Eruptive Processes in Active Regions on Oscillations of the Magnetic Field Parameters in Sunspot Umbrae

Yu. S. Zagainova and V. G. Fainshtein p. 899 abstract

Conditions for the Excitation of Type I Solar Bursts

P. A. Bespalov and O. N. Savina p. 910 abstract

The Frequency of Occurrence of Pre-Flare Fluctuations in Microwave Radiation of Active Regions

V. E. Abramov-Maximov and I. A. Bakunina p. 916 abstract

Links between Adjacent 11-Year Solar Cycles and Their Mutual Conditioning

V. G. Ivanov and Yu. A. Nagovitsyn p. 920 abstract

The Relationships between Cyclic Variations of Solar Magnetic Fields of Various Scales in Cycles 21–25

I. A. Bilenko p. 925 abstract

Sub-Terahertz Radiation Features from the Flare of Proxima Cen

Yu. T. Tsap, A. V. Stepanov and Yu. G. Kopylova p. 937 abstract

Isotope Traces of Early Solar Activity

G. I. Vasiliev, E. S. Melikhova and A. K. Pavlov p. 942 abstract

On the Role of the Neutral Plasma Component in the Electric Current Dissipation and the Formation of a Transition Region in the Solar Atmosphere

V. V. Zaitsev, A. V. Stepanov and E. G. Kupriyanova p. 947 abstract

Long-Term Changes in Main Trajectories of Extratropical Cyclones in the North Atlantic and Their Possible Association with Solar Activity

S. V. Veretenenko, P. B. Dmitriev and V. A. Dergachev p. 953 abstract

Long-Term Variations of the Magnetic Field of the Solar Photosphere

E. S. Vernova, M. I. Tyasto and D. G. Baranov p. 966 abstract

Features of the Structure and Dynamics of the Active Region 12 673 Associated with Flares

A. A. Golovko and I. I. Salakhutdinova p. 975 abstract

Solar Cycles and Covid-19 Pandemic Paradoxes

M. V. Ragulskaya p. 984 abstract

Studying the Wilson Effect from the Analysis of Averaged Sunspot Shapes

K. A. Tlatova and A. G. Tlatov p. 996 abstract

Magnetic Reconnection Flux during Two Flares on September 6, 2017

O. S. Gopasyuk, A. E. Volvach and I. V. Yakubovskaya p. 1000 abstract

Investigation of Joy’s Law According to the Data of the Ussuriisk Astrophysical Observatory

D. V. Erofeev and A. V. Erofeeva p. 1007 abstract

Observation of the Solar Eclipse on October 25, 2022 on Radio Telescopes of the Institute of Applied Astronomy, Russian Academy of Sciences (First Results)

D. V. Ivanov, I. A. Rakhimov, A. A. D’akov, G. N. Il’in, N. A. Topchilo, N. G. Peterova, A. V. Ipatov, T. C. Andreeva, E. Yu. Khvostov and V. Yu. Bikov p. 1015 abstract

Medium-Sized Solar Cycles in Different Epochs of Solar Activity

V. N. Ishkov p. 1024 abstract

Peculiarities of the Isotope Composition of Solar Cosmic Rays

G. A. Koval’tsov, V. M. Ostryakov and S. P. Sharag p. 1031 abstract

The Lower Ionosphere and Tectonic Processes on Earth

B. P. Komitov and V. I. Kaftan p. 1038 abstract

A Depression of Microwave Emission as a Response to the Appearance of a Jet

I. V. Kuzmenko p. 1047 abstract

Expansion and Compression of a Flare Loop System during the Flare on January 15, 2022 According to Ultraviolet and Microwave Data

V. F. Melnikov and N. S. Meshalkina p. 1054 abstract

Quick Event During the Decay Phase of the Microwave Emission of a Flare on May 22, 2021

I. D. Motyk, L. K. Kashapova, A. G. Setov, Yu. N. Shamsutdinova and E. G. Kupriyanova p. 1062 abstract

A Model of Frequency Modulation of the 11-Year Cycle of Solar Activity

N. G. Ptitsyna and I. M. Demina p. 1072 abstract

Acceleration of Nonthermal Electrons in Coordinated Interaction with Whistler Turbulence in a Flare Loop

L. V. Filatov and V. F. Melnikov p. 1079 abstract

On the Relationship of Solar Energetic Particles with Metric Type II Radio Bursts

Yu. T. Tsap, E. A. Isaeva and Yu. G. Kopylova p. 1086 abstract

Disk Counterparts of Type II Spicules on the Sun

G. V. Yakunina p. 1093 abstract

The Temporal Characteristics of the UVB–UVA Solar Radiation during Seasonal Observation Periods in Antarctica and the Arctic

S. N. Shapovalov p. 1101 abstract

Contents

Geomagnetism and Aeronomy