B-class flaring in NOAA 2759

NOAA 2759 was a small sunspot group from the new solar cycle 25. Using the JHelioviewer software, some movies were created showing the 5 B-class flares that it has produced during its transit so far.

The best of... 2019!

A  compilation  of  the  most  memorable  space  weather  moments  of  2019, featuring data, links and movies.

Heading for the solar cycle minimum

Based on the location and number of high-latitude sunspot groups, as well as the current level of sunspot numbers, a solar cycle minimum between September 2019 and February 2020 seems very likely.

"B" as in "Baby"

The now spotless active region NOAA 2758 produced a B-class flare on 11 March. The region belongs to the new solar cycle 25.

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.

The magnificent "7"

A recurrent coronal hole shaped as the number "7" was associated with very high wind speeds up to 750 km/s, resulting in unusually high numbers of energetic electrons in the earth environment.

Deep is the minimum...

A new long spotless stretch, very low observed values of the solar radio flux, and very high values for the cosmic rays flux: Clearly we are walking through the valley of the solar cycle minimum.

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.



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