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Definitions (21)
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Aurora
Glowing, dancing curtains of light in the upper atmosphere of a planet. Auroras are caused by the interaction between the planet’s magnetic field and charged particles from Earth’s magnetosphere. Auro [..]
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Chromosphere
The irregular layer of the solar atmosphere that is located above the photosphere and beneath the corona. The temperature in the chromosphere rises from 6000° C to about 20,000° C. It is hotter than t [..]
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Core
The innermost part of the Sun. The core produces colossal amounts of energy, including all of the Sun's light and heat. The temperature and pressure are so great in the Sun’s core that hydrogen a [..]
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Coronal hole
An area of the corona which appears dark in X-rays and ultraviolet light. They are usually located at the poles of the Sun, but can occur in other places as well. The magnetic field lines in a coronal [..]
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cosmic ray
High energy charged particles traveling through interstellar space at nearly the velocity of light. Most are produced in supernova explosions.
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ELECTROMAGNETIC SPECTRUM
The entire range of all the various kinds or wavelengths of electromagnetic radiation or light, including (from long to short wavelengths): radio, infrared, visible, ultraviolet, X-rays and gamma rays [..]
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Fission
The splitting of heavier atomic nuclei into lighter ones. In the case of heavy atoms (e.g., uranium, plutonium), this will release energy. Fission is how nuclear power plants produce energy.
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ion
An ion is an atom which has lost or gained one or more electrons so that it has a net electrical charge. Normally atoms have equal numbers of negatively charged electrons and positively charged proton [..]
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Magnetic field lines
A magnetic field has both a strength and a direction at each point in space. For example, at each point Earth, the magnetic field -- and thus a compass -- points in a particular direction, roughly tow [..]
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Magnetosphere
The solar wind pushes and stretches Earth's magnetic field into a vast, comet-shaped region called the magnetosphere. The magnetosphere and Earth's atmosphere protect us from the solar wind [..]
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