1. Cyclic Variations, Magnetic Morphology, and Complexity of Active Regions in Solar Cycles 23 and 24

   • A. V. Zhukova
   • D. D. Sokoloff
   • A. I. Khlystova

   OriginalPaper 21 December 2020 Pages: 673 - 683

   

2. Possibility of Diagnostics of the Beginning of Solar Cycle 25 Based on Its Precursors at Mid-Heliolatitudes

   • A. A. Golovko

   OriginalPaper 21 December 2020 Pages: 684 - 692

   

3. Ground-based Instrument for the Study of Cosmic Ray Variation in Nur-Sultan

   • E. A. Tulekov
   • V. S. Makhmutov
   • A. S. Dyusembekova

   OriginalPaper 21 December 2020 Pages: 693 - 698

   

4. Prolonged, Weak C1.2 Flares: A Source of Protons and Electrons

   • I. Yu. Grigor’eva
   • A. B. Struminskii
   • A. N. Shakhovskaya

   OriginalPaper 21 December 2020 Pages: 699 - 707

   

5. Behavior of He⁺⁺ Ions at the Front of an Interplanetary Shock

   • O. V. Sapunova
   • N. L. Borodkova
   • Yu. I. Yermolaev

   OriginalPaper 21 December 2020 Pages: 708 - 713

   

6. Differences in the Dynamics of the Asymmetrical Part of the Magnetic Disturbance during the Periods of Magnetic Storms Induced by Different Interplanetary Sources

   • L. A. Dremukhina
   • Yu. I. Yermolaev
   • I. G. Lodkina

   OriginalPaper 21 December 2020 Pages: 714 - 726

   

7. Ion Pressure in Different Regions of the Dayside Auroral Precipitation

   • V. G. Vorobjev
   • O. I. Yagodkina
   • E. E. Antonova

   OriginalPaper 21 December 2020 Pages: 727 - 736

   

8. Ground-Based and Satellite Observations of the SAR Arc in the MLT Evening Sector at the Beginning of the Magnetic Storm on March 17, 2015

   • I. B. Ievenko
   • S. G. Parnikov

   OriginalPaper 21 December 2020 Pages: 737 - 746

   

9. Reconstruction of the Parameters of the Lower Midlatitude Ionosphere in M- and X-Class Solar Flares

   • B. G. Gavrilov
   • V. M. Ermak
   • I. A. Ryakhovsky

   OriginalPaper 21 December 2020 Pages: 747 - 753

   

10. Influence of the Ionosphere on the Parameters of the GPS Navigation Signals during a Geomagnetic Substorm

    • V. I. Zakharov
    • A. A. Chernyshov
    • Y. Jin

    OriginalPaper 21 December 2020 Pages: 754 - 767

    

11. Implementation of Ionospheric Generators in the Numerical Model of the Global Electric Circuit

    • F. A. Kuterin
    • N. N. Slyunyaev

    OriginalPaper 21 December 2020 Pages: 768 - 780

    

12. Luminescence of Lyman–Birge–Hopfield Bands of N₂ in the Earth’s Atmosphere during the Precipitation of High-Energy Electrons

    • A. S. Kirillov
    • V. B. Belakhovsky

    OriginalPaper 21 December 2020 Pages: 781 - 786

    

13. Unitary Variation in the Seismic Regime of the Earth: Carnegie-Curve Matching

    • S. A. Pulinets
    • G. Ya. Khachikyan

    OriginalPaper 21 December 2020 Pages: 787 - 792

    

14. Paleointensity Bursts in the Geomagnetic Field History

    • A. Yu. Kurazhkovskii
    • N. A. Kurazhkovskaya
    • B. I. Klain

    OriginalPaper 21 December 2020 Pages: 793 - 799