Physical link of the polar field build-up with the Waldmeier effect broadens the scope of early solar cycle prediction: Cycle 25 is likely to be slightly stronger than Cycle 24

Abstract

Prediction of the solar cycle is challenging but essential because it drives space weather. Several predictions with varying amplitudes of the ongoing Cycle~25 have been made. We show that an aspect of the Waldmeier effect (WE2), i.e., a strong positive correlation between the rise rate and the amplitude of the cycle, has a physical link with the build-up of the previous cycle's polar field after its reversal. We find that the rise rate of the polar field is highly correlated with the rise rate and the amplitude of the next solar cycle. Thus, the prediction of the amplitude of the solar cycle can be made just a few years after the reversal of the previous cycle's polar field, thereby extending the scope of the solar cycle prediction to much earlier than the usual time. Our prediction of Cycle 25 based on the rise rate of the previous polar field is $137\pm 23$, which is quite close to the prediction $138\pm 26$ based on the WE2 computed from the available 2 years sunspot data of the ongoing cycle.

Accepted in MNRAS: Letters

References in corpus (12)

• 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
• Effects of the scatter in sunspot group tilt angles on the large-scale magnetic field at the solar surface
• Importance of Meridional Circulation in Flux Transport Dynamo: The Possibility of a Maunder-like Grand Minimum
• Solar Cycle Variability Induced by Tilt Angle Scatter in a Babcock--Leighton Solar Dynamo Model
• The Waldmeier effect and the flux transport solar dynamo
• Polar Network Index as a magnetic proxy for the solar cycle studies
• A theoretical study of the build-up of the Sun's polar magnetic field by using a 3D kinematic dynamo model
• Latitude Distribution of Sunspots: Analysis Using Sunspot Data and A Dynamo Model
• Waldmeier Effect in Stellar Cycles
• Synthetic solar cycle for active regions violating the Hale's polarity law

Cited by in corpus (2)

• Probing the variations in the timing of the Sun's polar magnetic field reversals through observations and surface flux transport simulations
• Hemispheric analysis of the magnetic flux in regular and irregular solar active regions