Two sunspot groups from the new solar cycle

On 24 December, 2 sunspot regions of the new solar cycle (SC25) were visible on the solar disk at the same time.


The Sun has been spotless for more than 33 days, longer than the longest spotless stretch of the previous solar cycle minimum.

A cat between the pigeons

The appearance of sunspot region NOAA 2749 ended a 27 day stretch of spotless days.

Are we there yet?...

A comparison of the current monthly solar radio flux values with those from previous solar cycle transits suggests that the next solar cycle minimum may take place during the summer of 2019.

Fair space weather for the Apollo 11 mission

Evaluating the solar and geomagnetic activity during the 16-24 July 1969 flight of Apollo 11, it becomes clear that space weather conditions were favorable to this historical mission to the Moon.

Treasures from the past - precursors for solar physics

Solar physics at the ROB has deep roots going back as far as the late 19th century. It involved a first promising era of solar studies, owing to Dr Eugène Jean Hubert Spée, followed by a 33-year long hiatus.

Sweet but a little bit psycho

An at first sight simple and symmetric sunspot produced a series of C-class flares. For the moment, none of the associated coronal mass ejections seems to have an earth-directed component.

Dynamic NOAA 2738

A big but quiet sunspot is transiting the solar disk. Photospheric lightbridges over this sunspot are continuously giving it a different appearance.

Preliminary prediction for the new solar cycle 25

An international team of researchers has issued a preliminary prediction for the upcoming solar cycle 25 (SC25). The strength of the new cycle is expected to be similar to the still ongoing solar cycle 24 (SC24).

Space junk

The space debris from an Indian satellite, destroyed in-orbit during a test with their anti-satellite missile system on 27 March, has raised concerns about the potential impacts on other satellites.



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