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No holidays for the Sun!...

The Sun remained busy this week producing several M-class flares. A particular impressive eruption took place on 28 July and was associated with the second moderate solar radiation storm of the ongoing Solar Cycle 25.

Heat waves on the Sun (EN-FR-NL)

A joint scientific team led by the Royal Observatory of Belgium (ROB) and the KU Leuven has found that high-frequency magnetic waves could play an essential role in keeping the Sun’s atmosphere at millions of degrees. This finding sheds a new light on the most intriguing solar mystery: what makes the Sun’s atmosphere hotter than its surface?

The towering inferno

A relatively small filament became unstable on 19 July and resulted in an impressive eruption and associated coronal mass ejection.

How do you communicate on extreme events?

The SIDC Forecasters at the Royal Observatory of Belgium played a key role in an ESA exercise to define how to communicate clearly on the impacts of extreme space weather events.

STEREO-A's inferior conjunction

After almost 17 years, STEREO-A is nearly back from where it all started.

Strongest proton event of SC25 so far

An M5.7 flare produced by NOAA 3363 drove the greater than 10 MeV proton flux to its highest levels so far this solar cycle, affecting HF communications over respectively the Earth's dayside (Pacific Ocean) and poles.

Open doors at the Radio Astronomy Station of Humain

Mark your calendars for the weekend of 9 and 10 September 2023!

Join us at the Radio Astronomy Station of Humain, in Wallonia, to celebrate Belgium’s rich and diverse heritage. This station was founded in 1953 by the Royal Observatory of Belgium to house the very first Belgian radio telescopes dedicated to observing the Sun.

The best of... 2022!

An overview and movie of some spectacular solar and space weather events in 2022 is available at the STCE's solar cycle highlights webpage.

The storm season on the Sun has begun

It has been from 2002 since so many sunspots have been seen on the sun in a single month. It shows that the sun is becoming more active and the "storm season" on the sun is in full swing. It raises the concern on a very severe solar storm. Should we be worried? We got this question from a journalist.

X-class flare in large sunspot group

One of the largest sunspot regions of the current solar cycle developed last week, producing an X-class flare late on 2 July. The monthly sunspot number for June 2023 is the highest so far this solar cycle.

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