Contents

Geomagnetism and Aeronomy

Vol. 61, No. 8, 2021

Subsecond Hard X-Ray Spikes from Solar Flares: Limitations on the Electron Acceleration Mechanism

Yu. E. Charikov, E. M. Sklyarova and A. N. Shabalin p. 1093  abstract

Rotation of the Solar Corona from Observations of Radio and X-Ray Solar Emission for Solar Activity Cycles 22–24

P. B. Dmitriev p. 1101  abstract

Diagnostics of Parameters of Hot Jets in the Solar Corona in Time Series of Images

A. G. Stupishin, S. A. Anfinogentov and T. I. Kaltman p. 1108  abstract

Type-II Spicules as Important Sources of Both Heating and Sustain the Mass Loss of Solar Corona

V. V. Zaitsev, A. V. Stepanov and P. V. Kronshtadtov p. 1116  abstract

Solar Flares in Extreme Ultraviolet and X-Ray Bands Based on SDO and TIMED Satellite Data

G. V. Yakunina and E. A. Bruevich p. 1122  abstract

Latitudinal-Temporal Analysis of Long-Periodic Variations of Coronal Bright Points

E. P. Minenko and Sh. A. Ehgamberdiev p. 1128  abstract

Spatio-temporal Dynamics of Fast Electrons and Plasma Turbulence in an Inhomogeneous Flare Plasma

P. V. Vatagin and I. V. Kudryavtsev p. 1135  abstract

Climate Oscillations in the Arctic Region in the Holocene and Solar Activity

V. A. Dergachev and S. N. Losev p. 1141  abstract

Features of Radio-Brightness Distribution over the Solar Disk at Millimeter Waves: Models and Observations

V. G. Nagnibeda, N. A. Topchilo, M. A. Loukitcheva and I. A. Rakhimov p. 1150  abstract

Features of the Behavior of Microwave and Ultraviolet Emission of Solar Active Regions in Relation to Eruptive and Confined Flares

I. A. Bakunina, V. F. Melnikov, V. E. Abramov-Maximov and A. S. Morgachev p. 1159  abstract

Spectral Diagnostics of Langmuir Coronal Plasma Turbulence Based on the Radio Emission at the Double Plasma Frequency

I. V. Kudryavtsev and T. I. Kaltman p. 1172  abstract

Evolution of the Source of the Active Region of the Sun

V. L. Merzlyakov and L. I. Starkova p. 1178  abstract

The Role of the Anomalous Doppler Effect in the Interaction of Energetic Electrons with Whistler Turbulence in Flare Loops

L. V. Filatov and V. F. Melnikov p. 1183  abstract

Nonthermal Electron Diffusion Modes in Whistler Turbulence in Flare Loops

V. F. Melnikov and L. V. Filatov p. 1189  abstract

Parameters of Electric Currents in Active Regions with Different Levels of Flare Productivity and Different Magnetomorphological Types

Yu. A. Fursyak, V. I. Abramenko and A. V. Zhukova p. 1197  abstract

Variations of Solar Activity Cycles in the Late Pleistocene Lacustrine Ribbon Clay Rhythms

M. I. Tyasto, V. A. Dergachev and P. B. Dmitriev p. 1207  abstract

Possible Cause of Differences between Reconstructions of the Heliospheric Modulation Potential in the Past Based on Data on the 10Be Content in the Ice of the Antarctic and Greenland

I. V. Kudryavtsev p. 1216  abstract

Analyzing the Variation of Lyapunov Exponents of the Time Derivatives of the Horizontal Geomagnetic Field during the Geomagnetic Storm

E. O. Falayi, A. S. Ajose, T. O. Roy-Layinde and A. T. Adewole p. 1221  abstract

Secular Variation of Geomagnetic Field at Karachi Observatory

Sumrah Hussain and Muhammad Nehal Khan p. 1234  abstract

An Investigation of the Global TEC Behavior from 1999 to 2017 Variations and Deviations

Mohammad Javad Kalaee, Mohammad Hossein Memarian and Zahra Nekoie p. 1240  abstract

Analysis of Changes in Magnetic Anomalies in the Largest Underground Gas Storage Area in China

Zhendong Wang, Can Wang and Chao Dong p. 1251  abstract

Flares Unaccompanied by Interplanetary Coronal Mass Ejections and Solar Proton Events

I. Yu. Grigor’eva and A. B. Struminsky p. 1263  abstract