The Sun’s magnetic field is about to flip – Astronomy Now

The Sun’s magnetic field is about to flip – Astronomy Now


In what ways will this solar magnetic ‘flip’ affect the Earth?

Sunspots
The SDO/HMI instrument captures Solar Cycle 25’s evolution from minimum (December 2019) to maximum (September 2024), showing sunspots, faculae, and two partial lunar transits (January 2021, May 2023).

The Sun, much like Earth, possesses a magnetic field, but unlike our planet’s relatively stable polarity, the Sun’s magnetic field undergoes a complete reversal approximately every 11 years. This remarkable phenomenon, known as a “flip,” signifies the halfway point of the Sun’s natural activity cycle, a period referred to as “solar maximum.” During this phase, the Sun reaches the peak of its energetic activity, characterized by an increase in the number and intensity of solar events.

Low activity
The solar magnetic field, modelled using the PFSS (Potential-Field Source Surface) method, is derived from photospheric magnetograms. This visualisation, captured by the Solar Dynamics Observatory (SDO), spans December 2019 to September 2024 (below).

As solar maximum approaches, the Sun’s surface becomes significantly more dynamic, with frequent and powerful eruptions such as solar flares and coronal mass ejections (CMEs). These dramatic releases of energy and charged particles can travel vast distances through space, sometimes reaching Earth. When they interact with our planet’s magnetic field, they have the potential to disrupt radio communications, interfere with GPS navigation systems, and even impact satellite operations. In some cases, they can trigger geomagnetic storms, which may cause fluctuations in power grids and other electrical infrastructure.

One of the most visually stunning consequences of this heightened solar activity is the intensification of auroras, commonly known as the Northern and Southern Lights. These breathtaking natural light displays occur when charged solar particles collide with molecules in Earth’s atmosphere, creating dazzling waves of color that dance across the sky. With the Sun steadily approaching its activity peak in 2025, opportunities to witness these magnificent auroras are expected to increase. For those hoping to catch a glimpse, monitoring local forecasts for clear skies and optimal viewing conditions will be essential. Checking sunrise and sunset times can also help determine the best windows for experiencing these mesmerizing celestial spectacles.



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