Article
Astronomy & Astrophysics
Pawan Kumar, Melinda Nagy, Alexandre Lemerle, Bidya Binay Karak, Kristof Petrovay
Summary: The polar precursor method is considered one of the most robust ways to predict the amplitude of an upcoming solar cycle, with the ability to make accurate predictions up to 4 years in advance. By combining observational data and model outputs, the correlation level of predictions can be further improved.
ASTROPHYSICAL JOURNAL
(2021)
Review
Astronomy & Astrophysics
Paul Charbonneau, Dmitry Sokoloff
Summary: This paper provides a general historical and technical introduction to the solar and stellar dynamo. It reviews the evolution and current state of dynamo theory and modeling, focusing on unresolved tension points such as mean-field electrodynamics, magnetic helicity conservation, differential rotation, meridional flows, and various dynamo mechanisms. The paper also discusses the potential connections between solar dynamo theory and modeling and observations of magnetic activity in late-type stars.
SPACE SCIENCE REVIEWS
(2023)
Review
Astronomy & Astrophysics
Aimee Norton, Rachel Howe, Lisa Upton, Ilya Usoskin
Summary: This article describes the defining observations of the solar cycle and their constraints on the dynamo processes within the Sun. It covers topics such as sunspot numbers, active region flux ranges and lifetimes, bipolar magnetic region tilt angles, Hale and Joy's law, and various other aspects.
SPACE SCIENCE REVIEWS
(2023)
Article
Engineering, Aerospace
H. S. Ahluwalia
Summary: Research predicts that solar cycle 25 (SC25) may be as active as SC24, reaching its peak around February 2024, challenging the accuracy of future space weather and climate forecasts. In addition, the fine structure of solar cycles cannot be accurately predicted.
ADVANCES IN SPACE RESEARCH
(2022)
Review
Astronomy & Astrophysics
Prantika Bhowmik, Jie Jiang, Lisa Upton, Alexandre Lemerle, Dibyendu Nandy
Summary: The dynamic activity of stars, such as the Sun, affects planetary space environments through various factors. Solar phenomena like flares and coronal mass ejections can cause hazardous space weather. The primary driver of solar activity is magnetic fields created by a mechanism called the magnetohydrodynamic dynamo. While the mechanism of solar cycles has been studied for a long time, predicting the strength of future sunspot cycles remains challenging. This review discusses observational constraints, recent physical insights, and advances in solar cycle predictions.
SPACE SCIENCE REVIEWS
(2023)
Article
Astronomy & Astrophysics
Elena Petrova, Tatiana Podladchikova, Astrid M. Veronig, Stijn Lemmens, Benjamin Bastida Virgili, Tim Flohrer
Summary: A method called RESONANCE is developed for predicting solar radio flux indices 1-24 months ahead, with an improved accuracy using an adaptive Kalman filter. The proposed approach statistically outperforms current algorithms and leads to improvements in re-entry forecasts as well.
ASTROPHYSICAL JOURNAL SUPPLEMENT SERIES
(2021)
Review
Astronomy & Astrophysics
Bidya Binay Karak
Summary: One obvious feature of the solar cycle is its variation from one cycle to another. This article reviews the dynamo models for the long-term variations of the solar cycle, including modulations beyond the 11-year periodicity. The article discusses the causes for the modulation, presents illustrative models, and highlights the current trends and challenges.
LIVING REVIEWS IN SOLAR PHYSICS
(2023)
Article
Astronomy & Astrophysics
Scott W. McIntosh, Robert J. Leamon, Ricky Egeland
Summary: We have identified an event in the solar timeline that played a role in the transition from sunspot Cycle 23 to sunspot Cycle 24. This rapid transition occurred over a short time period, potentially as short as a single solar rotation. We believe this transition was a critical moment for the Sun's global-scale magnetic field, as it overlapped with the spatially and temporally overlapping magnetic systems of the Sun's 22-year magnetic cycle, known as the Hale Cycle.
FRONTIERS IN ASTRONOMY AND SPACE SCIENCES
(2023)
Article
Astronomy & Astrophysics
Xing Wei
Summary: Thermal convection is commonly believed to be the energy source of stellar or planetary dynamo. In this short paper, the possibility of large-scale tidal flow as an alternative energy source is proposed. The magnetic energy induced by large-scale tidal flow, which is proportional to the cube of orbital frequency, is estimated based on dynamo equation and tidal theory. Future spectropolarimetric observations and numerical simulations for close binary stars can be used to test this estimation.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2022)
Article
Astronomy & Astrophysics
P. J. Kaepylae
Summary: This study investigates the effects of the effective thermal Prandtl number on the transition from anti-solar to solar-like differential rotation. The simulations show that the Prandtl number has little impact on the differential rotation. Magnetic fields and more turbulent regimes play a key role in achieving solar-like rotation.
ASTRONOMY & ASTROPHYSICS
(2023)
Article
Geosciences, Multidisciplinary
Limei Yan, Fei He, Xinan Yue, Yong Wei, Yuqi Wang, Si Chen, Kai Fan, Hui Tian, Jiansen He, Qiugang Zong, Lidong Xia
Summary: This study provides definitive observational evidence that an 8-year solar cycle existed during the Maunder Minimum, which has important implications for solar dynamo models and the generation mechanism of grand solar minima.
Article
Astronomy & Astrophysics
Scott W. McIntosh, Philip H. Scherrer, Leif Svalgaard, Robert J. Leamon
Summary: This article introduces the Wilcox Solar Observatory's cataloging of two magnetic cycles of solar activity through the observation of the Sun's large-scale magnetic field, and explores the connection between the Extended Solar Cycle and the fundamental Hale Cycle. With the beginning of Sunspot Cycle 25, there is increasing interest in observing and mapping these cycles for their potential predictive capability.
FRONTIERS IN ASTRONOMY AND SPACE SCIENCES
(2022)
Article
Astronomy & Astrophysics
Paul Charbonneau
Summary: In this paper, the author investigates the effects of external forcing on the solar dynamo on long timescales, as well as the synchronization of an autonomous internal dynamo through external tidal forcing. The study finds that while the external forcing signal can be detectable in principle, it is usually obscured by internal fluctuations. Additionally, synchronization can be achieved through external tidal forcing, but it requires high forcing amplitudes.
FRONTIERS IN ASTRONOMY AND SPACE SCIENCES
(2022)
Article
Environmental Sciences
Boris Komitov
Summary: This study discusses the relationship between the annual ring widths of European beech samples and solar-climate influences, highlighting oscillations related to the solar magnetic cycle. The analysis reveals the effects of solar minima on tree growth and predicts potential phase catastrophes and climate trends in Central Bulgaria after 2030 AD.
Review
Astronomy & Astrophysics
Sonia M. Tikoo, Alexander J. Evans
Summary: This study explores the importance of magnetic fields in planetary evolution, revealing the magnetic and evolutionary histories of Mercury, Earth, Mars, the Moon, and several planetesimals through spacecraft-based studies and paleomagnetic research. The geometries, intensities, and longevities of dynamo fields can provide information on core processes and planetary thermal evolution.
ANNUAL REVIEW OF EARTH AND PLANETARY SCIENCES
(2022)
Article
Geochemistry & Geophysics
A. A. Skakun, D. M. Volobuev
GEOMAGNETISM AND AERONOMY
(2017)
Article
Astronomy & Astrophysics
D. M. Volobuev, N. G. Makarenko
Article
Geochemistry & Geophysics
A. A. Skakun, D. M. Volobuev
GEOMAGNETISM AND AERONOMY
(2017)
Article
Geochemistry & Geophysics
I. V. Kudryavtsev, D. M. Volobuev, V. A. Dergachev, Yu. A. Nagovitsyn, M. G. Ogurtsov
GEOMAGNETISM AND AERONOMY
(2018)
Article
Geochemistry & Geophysics
D. M. Volobuev
Summary: It is found that the number of polar faculae in solar cycles is more variable compared to the number of sunspots, requiring more parameters for description. The high and low amplitude cycles can be clearly separated in the faculae, but not in the number of sunspots. Bifocal dynamics can be obtained from the simplified magnetic dynamo equations as a Lorentz-type dynamic attractor.
GEOMAGNETISM AND AERONOMY
(2022)
Article
Geochemistry & Geophysics
A. A. Skakun, D. M. Volobuev
Summary: The causal relationships between the North Atlantic Oscillation, El Nino-Southern Oscillation, Pacific Decadal Oscillation, and Total Solar Irradiance climate indices have been analyzed using the conditional dispersion method. The results suggest that Total Solar Irradiance affects El Nino-Southern Oscillation and Pacific Decadal Oscillation, but the relationship between North Atlantic Oscillation and Total Solar Irradiance remains unclear.
GEOMAGNETISM AND AERONOMY
(2022)
Article
Geochemistry & Geophysics
D. M. Volobuev, N. G. Makarenko
GEOMAGNETISM AND AERONOMY
(2020)
Article
Geochemistry & Geophysics
D. M. Volobuev, N. G. Makarenko, I. S. Knyazeva
GEOMAGNETISM AND AERONOMY
(2019)
Article
Geosciences, Multidisciplinary
Mikhail Y. Verbitsky, Michael E. Mann, Byron A. Steinman, Dmitry M. Volobuev
GEOSCIENTIFIC MODEL DEVELOPMENT
(2019)
Article
Geosciences, Multidisciplinary
Mikhail Y. Verbitsky, Michel Crucifix, Dmitry M. Volobuev
EARTH SYSTEM DYNAMICS
(2019)
Article
Geochemistry & Geophysics
A. V. Mordvinov, A. A. Skakun, D. M. Volobuev
GEOMAGNETISM AND AERONOMY
(2018)
Article
Geochemistry & Geophysics
A. A. Skakun, D. M. Volobuev, A. V. Mordvinov
GEOMAGNETISM AND AERONOMY
(2018)
Article
Geochemistry & Geophysics
V. A. Dergachev, D. M. Volobuev
GEOMAGNETISM AND AERONOMY
(2018)
Article
Geosciences, Multidisciplinary
Mikhail Y. Verbitsky, Michel Crucifix, Dmitry M. Volobuev
EARTH SYSTEM DYNAMICS
(2018)
Proceedings Paper
Astronomy & Astrophysics
D. M. Volobuev, N. G. Makarenko, I. S. Knyazeva
INTERNATIONAL CONFERENCE ON PARTICLE PHYSICS AND ASTROPHYSICS (ICPPA-2015), PTS 1-4
(2016)