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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
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 stellar wind. ... > full story
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 wind
... > 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
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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 -
Aurora (astronomy)
The aurora is a glow observed in the night sky, usually in the polar zone. It is also known as "northern lights" or "aurora borealis," which is Latin for "northern dawn" since in Europe especially, ... > 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 -
Ionosphere
The ionosphere is the part of the atmosphere that is ionized by solar radiation. It plays an important part in atmospheric electricity and forms the inner edge of the magnetosphere. It has practical ... > more -
Earth's magnetic field
Earth's magnetic field (and the surface magnetic field) is approximately a magnetic dipole, with one pole near the geographic north pole and the other near the geographic south pole. The locations of ... > more -
Interstellar medium
The interstellar medium (or ISM) is the name astronomers give to the tenuous gas and dust that pervade interstellar space. Whilst the ISM refers to the matter (interstellar matter, also abbreviated ... > more
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