Zonal harmonics of solar magnetic field for solar cycle forecast
arXiv:2108.10527 · doi:10.1016/j.jastp.2021.105743
Abstract
According to the scheme of action of the solar dynamo, the poloidal magnetic field can be considered a source of production of the toroidal magnetic field by the solar differential rotation. From the polar magnetic field proxies, it is natural to expect that solar Cycle 25 will be weak as recorded in sunspot data. We suggest that there are parameters of the zonal harmonics of the solar surface magnetic field, such as the magnitude of the =3 harmonic or the effective multipole index, that can be used as a reasonable addition to the polar magnetic field proxies. We discuss also some specific features of solar activity indices in Cycles 23 and 24.
arXiv comment20 pages, 10 Figures, accepted in JSTP
References in corpus (20)
- Predicting solar cycle 24 with a solar dynamo model
- Solar activity forecast with a dynamo model
- Solar Cycle Propagation, Memory, and Prediction: Insights from a Century of Magnetic Proxies
- Progress in Solar Cycle Predictions: Sunspot Cycles 24-25 in Perspective
- On Predicting the Solar Cycle using Mean-Field Models
- Predicting the Amplitude and Hemispheric Asymmetry of Solar Cycle 25 with Surface Flux Transport
- Solar cycle 25: another moderate cycle?
- Turbulent Pumping of Magnetic Flux Reduces Solar Cycle Memory and thus Impacts Predictability of the Sun's Activity
- Variations of the solar cycle profile in a solar dynamo with fluctuating dynamo governing parameters
- Improvement of solar cycle prediction: Plateau of solar axial dipole moment
- Neural Network Forecast of the Sunspot Butterfly Diagram
- Solar large-scale magnetic field and cycle patterns in solar dynamo
- Torsional Oscillations in Dynamo Models with Fluctuations and Potential for Helioseismic Predictions of the Solar Cycles
- A new solar signal: Average maximum sunspot magnetic fields independent of activity cycle
- What causes geomagnetic activity during sunspot minimum
- Cyclic variations in the main components of the solar large-scale magnetic field
- Nonlinear mean-field dynamo and prediction of solar activity
- Long-term variations of geomagnetic activity and their solar sources
- The magnetic helicity density patterns from non-axisymmetric solar dynamo
- Long- and Mid-Term Variations of the Soft X-ray Flare Type in Solar Cycles