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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.

    NOAA 1515: pictures of the M6.9 flare on July 8

    As noted in a previous comment, NOAA 1515 produced 5 high energetic events during its transit. The last of these events was an M6.9-flare on July 8th that occurred while NOAA 1515 was already close to the western solar limb. The flare started at 16:23UT and reached its maximum x-ray intensity at 16:32UT. The images underneath show the eruption as seen by PROBA2/SWAP and in H-alpha during the flare's peak and at 16:54UT. One can clearly see that material is ejected from the blast site.

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