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Large and larger

Two large sunspot groups, NOAA 4478 and NOAA 4479, have been dominating the sunspot and flare activity during the previous week.

A new kid in the X-class town

While NOAA 4479 is approaching the Sun's west limb merrily producing M-class flares, a new active region NOAA 4482 has rounded the Sun's southeast limb producing an X1.3 flare.

NOAA 4479 produces an X-class flare

After several days of development, NOAA 4479 finally produced an X1 flare late on 30 June.

Solar Radio Bursts

Solar Radio Bursts may significantly affect various technologies such as radars and GNSS applications. The STCE's SC25 Tracking page has now been supplemented with graphs of strong bursts (more than 5000 sfu) at 8 different frequencies for the period 1996-2025.

Look who's back!...

A dynamic nest of sunspot regions returned on 19 June and produced several M-class flares.

Successful Proba-3 mission extended until 2028

The European Space Agency’s (ESA) Proba-3 mission is extended until August 2028. This space mission, involving a significant Belgian contribution, is studying the lower layers of the Sun’s corona.

Tracking SC25

The STCE's SC25 Tracking page has been updated to reflect the latest evolution of some critical space weather parameters for the ongoing solar cycle 25 (SC25).

ASPIICS is back in business!

After an anomaly onboard Proba-3's Coronagraph spacecraft led to loss of contact between the spacecraft and ground control last February, a tiger team worked relentlessly to get the spacecraft and its ASPIICS coronagraph back. After about 2 months of careful and gradual testing, a first formation flight was successfully performed last week. This was the moment of truth for the ASPIICS coronagraph.

Itchy NOAA 4455

NOAA 4455 produced 2 strong M-class flares and one X1 flare in less than 12 hours. The related coronal mass ejections are expected to hit the near-earth environment from late on 4 June through 5 June. There's a small chance for auroras over Belgium. UPDATED (1).

The great geomagnetic storm of 4 February 1872

The great geomagnetic storm of 4 February 1872 is renowned for its splendid aurora and crippling the telegraphic services worldwide, even at near-equatorial locations.

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