Over Four Decades, Scientists Identify Consistent Shifts in the Solar Activity Cycle

Examining the Sun's Magnetic Behavior

According to НВ — Техно: A study published on June 5 in Science Alert has uncovered systematic changes in the solar activity cycle over the past 40 years. Led by astrophysicist Bill Chaplin from the University of Birmingham, the research team found that magnetic activity is increasingly concentrating near the Sun's surface. This shift could have significant implications for predicting space weather, which affects satellite operations and power grids on Earth.

The solar activity cycle lasts roughly 11 years. The 24th cycle was notably weaker than its predecessors in terms of sunspot count and radiation output. For their analysis, scientists examined nearly four decades of data from the Birmingham Solar Oscillations Network (BiSON), a network that has continuously monitored the Sun since 1976. The dataset spans from 1987 and includes cycles 22 through 25. BiSON employs helioseismology, a technique that allows researchers to probe the Sun's internal structure by studying sound waves traveling through it.

“We have found evidence of systematic changes in the solar activity cycle.” - Bill Chaplin

He added that “with each new cycle, magnetic activity is becoming more concentrated near the Sun's surface.” This discovery was made possible by BiSON's long-term observations, highlighting the value of sustained monitoring over decades.

Yale University astronomer Sarbani Basu reported a shift in the relationship between the Sun's internal oscillations and its surface activity. She noted that “the connection between the Sun's internal vibrations and its surface activity has changed over recent cycles.” According to her, “the observed trend cannot be explained solely by a weakening magnetic field.” The findings point to a structural reorganization of the mechanisms through which the Sun's magnetic activity builds up beneath its surface.

Future Expectations and Technological Impact

The onset of the 26th cycle is expected around 2030. Scientists believe that prolonged observation of the Sun helps improve understanding of changes in its magnetic field. Continued monitoring will reveal how this relationship evolves after the 25th cycle ends and the 26th begins.

This research underscores the importance of long-term solar monitoring for understanding changes that could affect space weather and Earth-based technologies. Shifts in the Sun's magnetic activity may impact:

• satellites
• power grids
• other systems reliant on a stable space environment

Further studies could help scientists better predict these changes and their effects on our planet.