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A filament's jump to fame


Filaments are clouds of cooler gas trapped between magnetic fields of opposite polarity. Seen in suitable filters, they look like dark lines and strands against the hotter solar disk. Near the limb, when their silhouette is observed, they glow as towering, torches, hedges and arches. They are then called prominences.

All quiet on the solar front


Even when a solar cycle is close to its maximum, it may happen from time to time there are periods with low solar activity. This is especially true when the maximum is predicted to be already low to medium, as is the case for ongoing solar cycle 24.
Space weather forecasters can issue an alert when solar activity is extremely low. This "all quiet alert" is a message sent when quiet space weather conditions are expected for the next 48 hours or until further notice. This implies that:

Die-Hard 2: The explosive finale


In one of the previous STCE Newsletters, a long-living and quite dynamic solar filament was discussed.

Fairies circle the solar north pole


A die-hard solar filament


Curiosity and the Proton Flares


A roller coaster named "Sunspot Number"


A CME with an Olympic speed

A solar flare plays hide-and-seek

The graph underneath could have been the profile of a mountain stage in the Tour de France, but no: it shows the evolution of the x-ray flux as it was observed by the GOES-15 satellite from 17 till 19 July 2012.

X1 flare in NOAA 1520

In the afternoon of July 12, 2012, the complex and up-to-then relatively quiet sunspot group NOAA 1520 all of a sudden produced an extreme solar flare.

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