The sun has released its most powerful solar flare in seven years, following another explosion earlier this week. Both occurrences have sent coronal mass ejections (CMEs) towards Earth, likely providing spectacular aurora displays across much of the world this weekend. The most recent X9 Solar Flare – the most powerful form of flare the sun can produce — erupted from sunspot AR3842 at about 8 a.m. EDT on Thursday, October 3. With a magnitude of at least X9, this flare is the most intense solar explosion of the current solar cycle, exceeding the X8.7 flare observed in May. This is the most intense solar flare since September 2017, when the sun produced X11.8 and X13.3 flares within a few days.

This newest flare launched a wave of radiation towards Earth, breaching the planet’s magnetic shield, known as the magnetosphere. The flare ionised the upper atmosphere, producing a short radio blackout over Africa and the South Atlantic Ocean. It also made a CME, a fast-moving cloud of plasma and solar particles that is expected to hit Earth on Sunday, October 6, according to Spaceweather.com.

Source: Space Weather Live

Increasing Solar Activity and Geomagnetic Storms

Earlier this week, on Monday, October 1, the same sunspot, AR3842, produced another gigantic X7.1 flare, the third most intense in the current solar cycle. This event also resulted in a radio blackout, this time across the Pacific Ocean, and delivered another CME towards Earth.

When these CMEs hit Earth, they are likely to trigger geomagnetic storms. These storms allow solar particles to penetrate deeper into the Earth’s atmosphere, resulting in brilliant auroras that can be seen at unusually low latitudes. According to the National Space Weather Prediction Centre, a geomagnetic storm of a “strong” (G3) intensity might last from October 4 to October 6, increasing the likelihood of auroras.

These recent solar outbursts indicate that we have reached the apex of the sun’s approximately 11-year solar cycle, known as the solar maximum. Initially, scientists expected this phase to begin next year and be less active than prior cycles. However, the sun has demonstrated greater activity than projected, causing experts to adjust their forecasts.

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Record Solar Activity in 2024

The year 2024 has already seen an exceptional level of solar activity. Earth suffered its most violent geomagnetic storm in May in 21 years, sparked by a barrage of X-class CMEs that resulted in some of the most extensive auroras seen in 500 years. By August, the number of visible sunspots was at a 23-year high. According to SpaceWeatherLive, the current X9 Solar Flare is the 42nd X-class flare of 2024, when the previous nine years combined saw only 36 such flares.

The frequency of geomagnetic storms and auroras will increase in the coming months when the Earth’s magnetic field aligns more closely with the solar wind around the autumn equinox. This alignment enhances the risk of solar storms affecting Earth’s magnetosphere. Researchers warn that sunspot AR3842 may produce even stronger solar flares in the coming days, highlighting the sun’s erratic behaviour during this solar maximum.

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