Home / Editor's Pick /

Latest solar activity: Large sunspot visible

06:00
24 January 2023

Latest solar activity
Large sunspot visible

A large sunspot is visible (right centre of image) on January 21st 2023.A large sunspot is visible (right centre of image) on January 21st 2023. - © NASA/SDO and the AIA, EVE, and HMI science teams

The sun is currently bubbling with activity, with one particularly large sunspot that is associated with strong solar flares.

Very large sunspots can currently be observed on the sun as dark spots, but you should never look straight at the sun without appropriate eye protection.

These dark spots are cooler and therefore emit less visible light than the rest of the surface. The largest spot in this group is about five times the diameter of the Earth and is clearly visible.

Effects of sunspots

The number and size of sunspots are an indication of the sun's activity, which follows a regular cycle. Around every 11 years, the activity oscillates between a fairly quiet phase and a period with significantly more plasma eruptions and strong solar winds.

The last sunspot minimum occurred in December 2019, with the next solar maximum expected around 2025, half a cycle (5.5 years) later.

We are currently in the middle of the 25th sunspot cycle (since 1755) so the current bubbling on the sun is nothing particularly unusual.

That being said, effects can still occur. The increased solar activity can cause so-called solar storms, where large quantities of charged particles are hurled into space, which often hit the Earth's magnetic field.

In particular instances, very strong solar storms can have serious consequences for the technical infrastructure:

  • Power grids collapse and GPS satellites fail.
  • Mobile phone networks are disrupted for months.
  • Blackouts are possible in conurbations, sometimes with losses running into billions.
  • Radar systems are disrupted and air traffic is affected.
  • Astronauts have to stay in their spaceships because of the strong radiation.

However these instances are rare and it is estimated that such strong solar storms only "hit" the Earth every 100 to 200 years. More often than not, there are no major problems on Earth and instead they produce beautiful auroras.

Weather & Radar editorial team
More on the topic
Tuesday 1 July 2025

Not just the UK

Heatwave grips continental Europe
Saturday 28 June 2025

Grab the sun cream

High UV levels to end the week
Monday 30 June 2025

Noctilucent cloud season

Shimmering clouds over UK and Ireland
All weather news
This might also interest you
Wednesday 2 July 2025

Isolated strikes here

Storms across Europe mostly miss UK
Wednesday 2 July 2025

Breakfast brief

Cooler with stormy potential
Friday 27 June 2025

Breakfast brief

Rain for some, heat returns elsewhere
All articles
Weather & Radar

www.weatherandradar.ie

facebooktwitteryouTubeContact uslinkList
Privacy Policy | Legal info | Accessibility statement