Sun’s Magnetic Activity Is Making It Tough to Gauge Its True Age, Research Finds

Astronomers have historically relied on helioseismology to estimate the Sun’s age by analysing the vibrations that ripple by way of its inside. However, latest analysis has uncovered a major impediment, the Sun’s magnetic exercise, which follows an 11-year cycle, seems to be distorting these measurements. Data from the Birmingham Solar Oscillations Network (BISON) and NASA’s SOHO mission, which spans over 26.5 years, revealed a 6.5 % distinction within the Sun’s age when measured on the photo voltaic minimal in comparison with the photo voltaic most.

This discrepancy, attributed to variations within the Sun’s magnetic exercise, means that comparable strategies used to measure the age of different stars may also be affected, significantly these with extra intense magnetic fields.

How Magnetic Activity Alters Solar Age Perceptions

The Sun’s magnetic exercise, which alternates between photo voltaic minimal and most, is extra influential than beforehand thought, based on a analysis paper revealed within the Astronomy & Astrophysics journal. During durations of excessive magnetic exercise, the oscillations throughout the Sun—detected by devices like BISON and GOLF (Global Oscillations at Low Frequency)—produce outcomes that point out a youthful Sun than throughout instances of low magnetic exercise.

These oscillations, attributable to inner waves throughout the Sun, change the luminosity and floor actions, permitting scientists to deduce particulars concerning the Sun’s inner construction and, theoretically, its age. However, the sudden affect of magnetic exercise on these measurements challenges the long-held assumption that such exercise ought to have little affect on helioseismology.

Challenges for Future Stellar Observations

The implications of this discovery prolong past our Sun. As scientists put together for the European Space Agency’s upcoming PLATO mission, which is ready to launch in 2026, they have to now think about the affect of magnetic exercise when measuring the age, mass, and radius of distant stars. PLATO goals to detect dips in starlight attributable to each transiting exoplanets and asteroseismic oscillations, much like these noticed within the Sun.

If magnetic exercise considerably alters these measurements, as seen with the Sun, it may necessitate a reevaluation of previous knowledge from missions like NASA’s Kepler Space Telescope. This revelation poses a “looming challenge” for the way forward for asteroseismology, requiring new strategies to make sure correct measurements of stellar ages, particularly for extra magnetically energetic stars.