Washington: At least 17 solar eruptions from a single sunspot on the sun have blasted into space in recent days, and may reach Earth as moderate geomagnetic storms by Thursday.

The sun eruptions originated from an overactive sunspot, called AR2975, which has been firing off flares since Monday (March 28). The stellar event may also cause some moderate sky storms on Earth, Space.com reported.

Sunspots are eruptions on the sun that occur when magnetic lines twist and suddenly realign near the visible surface. At times, these explosions are associated with coronal mass ejections (CMEs), or streams of charged particles that shoot into space. NASA's powerful Solar Dynamics Observatory captured stunning views of the solar eruptions, as did the Solar and Heliospheric Observatory.

"The eruptions have hurled at least two, possibly three, CMEs toward Earth," wrote SpaceWeather.com of the event.

NASA and the National Oceanic and Atmospheric Administration, the website added, suggest the first CME will arrive on Thursday (March 31), with at least one other expected on Friday (April 1), the report said.

Modelling suggests that the particles may generate G2 or G3 (moderate) geomagnetic storms, although auroras (northern lights and southern lights) are notoriously hard to predict.

While this possible storm is only moderate, NASA and other space agencies keep an eye on solar activity to improve solar weather predictions. A strong flare aimed towards Earth, along with a large CME, may induce problems such as damaging power lines or disabling satellites.

The year 2022 is expected to be relatively quiet for the Sun overall, as we are still towards the beginning of the 11-year solar cycle of activity that began in December 2019. Cycle beginnings usually have fewer sunspots and fewer eruptions. Activity should increase as we approach the peak, forecasted to be in mid-2025.

Scientists are debating how strong this current solar cycle will be, although forecasts so far indicate that the average number of sunspots may be lower than usual, the report said.

(IANS)