🌌 NASA Astronomy Picture of the Day
X-Ray Earth
Date: 1996-12-30

Explanation:
The Earth glows in many kinds of light, including
the energetic X-ray band.
Actually, the Earth itself does
not glow - only aurora produced high
in the Earth's atmosphere.
Above is the first picture of the Earth in X-rays,
taken in March with the orbiting Polar satellite.
Bright X-ray emission
is shown in red. Energetic ions from the Sun
cause aurora
and energize electrons
in the Earth's magnetosphere.
These electrons move along the Earth's magnetic field
and eventually strike the Earth's ionosphere,
causing the X-ray emission. These X-rays are not dangerous because
they are absorbed by lower parts of the Earth's atmosphere.







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