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Solar flare
A solar flare is a violent
explosion in the Sun's
atmosphere with an energy
equivalent to tens of
millions of hydrogen bombs.
Solar flares take place in
the solar corona and
chromosphere, heating plasma
... > full story
Corona
In astronomy, a corona is
the luminous plasma
"atmosphere" of the Sun or
other celestial body,
extending millions of
kilometres into space, most
easily seen during a total
solar eclipse, but also
... > full story
Solar radiation
Solar radiation is radiant
energy emitted by the sun,
particularly electromagnetic
energy. About half of the
radiation is in the visible
short-wave part of the
electromagnetic spectrum.
The other half is mostly in
... > full story
Sunspot
A sunspot is a region on the
Sun's surface (photosphere)
that is marked by a lower
temperature than its
surroundings and intense
magnetic activity, which
inhibits convection, forming
areas of low surface
... > full story
Browse Reference Articles
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Solar wind
A solar wind is a stream of charged particles (i.e., a plasma) which are ejected from the upper atmosphere of a star. When originating from stars other than the Earth's Sun, it is sometimes called a ... > more -
Geomagnetic storm
A geomagnetic storm is a temporary disturbance of the Earth's magnetosphere. Associated with solar coronal mass ejections, coronal holes, or solar flares, a geomagnetic storm is caused by a solar ... > more -
Red supergiant
Red supergiants are supergiant stars of spectral type K-M and a luminosity class of I. They are the largest stars in the universe in terms of physical size, although they are not the most massive. ... > more -
Blue supergiant
Blue supergiants are supergiant stars (class I) of spectral type O. They are extremely hot and bright, with surface temperatures of between 20,000 - 50,000 degrees Celsius. The best known example is ... > more -
Magnetosphere
A magnetosphere is the region around an astronomical object in which phenomena are dominated or organized by its magnetic field. Earth is surrounded by a magnetosphere, as are the magnetized planets ... > more -
Supergiant
Supergiants are the most massive stars. Supergiants can have masses from 10 to 70 solar masses and brightness from 30,000 up to hundreds of thousands times the solar luminosity. They vary greatly in ... > more -
Van Allen radiation belt
The Van Allen radiation belt is a torus of energetic charged particles (i.e. a plasma) around Earth, trapped by Earth's magnetic field. When the belts "overload", particles strike the upper ... > more -
Luminosity
In general physics, luminosity (more properly called luminance) is the density of luminous intensity in a given ... > more
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