The Sunspot that won’t explode

Measuring more than 150,000 km wide, sunspot AR2396 is one of the biggest sunspots of the current solar cycle. For the past week it has crossed the solar disk apparently poised to explode. Yet it has not. “It is a sleeping giant,” says Sergio Castillo, who photographed the behemoth from his backyard observatory in Corona, CA:


AR2396 is huge, but dormant,” says Castillo. “There are very few flares erupting out of it.”

Castillo took the picture using a “Calcium K” filter tuned to the light of ionized calcium atoms in the sun’s lower atmosphere.Calcium K filters highlight the bright magnetic froth that sometimes forms around a sunspot’s dark core. AR2396 is very frothy, indeed.

Magnetic froth, however, does not herald an explosion. It merely means that the sunspot is photogenic.


Image: Yvan on August 7, 2015 @ Berlare, Belgium


One thought on “The Sunspot that won’t explode

  1. The Sun is a mystery because its composition and source of energy were changed after WWII.

    _ 1. Its internal composition was changed from mostly iron (Fe) in 1945 to mostly hydrogen (H) in 1946

    _ 2. Neutron repulsion was obscured by replacing Aston’s valid nuclear packing fraction in textbooks with Weizsacker’s deceptive nuclear binding energy after WWII.

    Yesterday, seventy years after the destruction of Hiroshima and Nagasaki, Japan Times allowed the people of Japan to know what a nuclear geochemist, Dr. Paul Kazuo Kuroda, realized in August 1945: This force of destruction was used as the force of creation at the beginning of the world five billion years (5Ga) ago:

    After WWII, public knowledge was forbidden of the composition (neutrons) and energy (neutron repulsion) in cores of:

    Heavy atoms like Uranium
    Some planets like Jupiter
    Ordinary stars like the Sun
    Galaxies like the Milky Way
    The expanding Universe


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