The Sun's 'Heartbeat': 40 Years of Data Reveal Internal Shifts

Research analyzing four decades of solar data from the Birmingham Solar Oscillations Network (BiSON) has revealed that the Sun's internal structure undergoes subtle but measurable shifts between its 11-year magnetic cycles. These shifts, detected through helioseismology, leave detectable fingerprints that could potentially improve space weather forecasting. The study focused on four successive solar minima, periods traditionally viewed as the Sun's most uniform state. However, the analysis revealed that each minimum differed subtly from the last, indicating that the Sun's outer layers shift measurably from one quiet period to the next. The deepest, most prolonged minima left the clearest internal fingerprints of all. This finding challenges the notion of solar minima as blank slates and suggests that these quiet periods set the tone for subsequent activity cycles. The ability to forecast space weather more accurately has significant implications for protecting critical infrastructure, including communication satellites, power grids, and GPS networks, from energetic outbursts from the Sun. Further research is needed to fully understand the relationship between the Sun's internal shifts and its activity cycles.

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