Impact of rogue active regions on hemispheric asymmetry

Abstract

The solar dipole moment at activity minimum is a good predictor of the strength of the subsequent solar cycle. Through a systematic analysis using a state-of-the-art 2$\times$2 D solar dynamo model, we found that bipolar magnetic regions (BMR) with atypical characteristics can modify the strength of the next cycle via their impact on the buildup of the dipole moment as a sunspot cycle unfolds. In addition to summarizing these results, we present further effects of such "rogue" BMRs. These have the ability to generate hemispheric asymmetry in the subsequent sunspot cycle, since they modify the polar cap flux asymmetry of the ongoing cycle. We found strong correlation between the polar cap flux asymmetry of cycle i and the total pseudo sunspot number asymmetry of cycle i + 1 . Good correlation also appears in the case of the time lag of the hemispheres of cycle i + 1.

References in corpus (10)

• Calibrating 100 Years of Polar Faculae Measurements: Implications for the Evolution of the Heliospheric Magnetic Field
• An Updated Solar Cycle 25 Prediction with AFT: The Modern Minimum
• Predicting the Amplitude and Hemispheric Asymmetry of Solar Cycle 25 with Surface Flux Transport
• Solar Cycle Variability Induced by Tilt Angle Scatter in a Babcock--Leighton Solar Dynamo Model
• Recovering Joys Law as a Function of Solar Cycle, Hemisphere, and Longitude
• A 3D Babcock-Leighton Solar Dynamo Model
• Hemispheric Asymmetries of Solar Photospheric Magnetism: Radiative, Particulate, and Heliospheric Impacts
• ALMA Observations of Warm Dense Gas in NGC 1614 --- Breaking of Star Formation Law in the Central kpc
• Secular variation of hemispheric phase differences in the solar cycle
• A Three-Dimensional Babcock-Leighton Solar Dynamo Model: Initial Results with Axisymmetric Flows

Cited by in corpus (5)

• Impact of Anomalous Active Regions on the Large-scale Magnetic Field of the Sun
• Dynamo Model for North-South Asymmetry of Solar Activity
• Synthetic solar cycle for active regions violating the Hale's polarity law
• Hemispheric analysis of the magnetic flux in regular and irregular solar active regions
• Inferring Quadrupolar Dynamo Mode from Sunspot Statistics