radiation belts

One or more doughnut-shaped regions in the magnetosphere of a planet in which energetic electrons and the ionized nuclei of atoms, chiefly protons from hydrogen atoms, are trapped by the planet's magnetic field. The particles within the belt, whose axis is the magnetic axis of the planet, spiral along magnetic field lines, traveling backward and forward between reflections which occur as they approach the magnetic poles. This motion produces synchrotron emission from the particles. The particles are either captured from the solar wind or are formed by collisions between cosmic rays and atoms or ions in the planet's outer atmosphere.

The Earth, Jupiter, Saturn, Uranus, and Neptune are all known to possess radiation belts. The magnetic field of Mercury appears to be too weak to sustain belts. The radiation belts of Jupiter are many times more intense than the Van Allen radiation belts of the Earth and pose a threat to spacecraft systems in the vicinity of the planet.

单词	radiation belts
释义	radiation belts radiation belts One or more doughnut-shaped regions in the magnetosphere of a planet in which energetic electrons and the ionized nuclei of atoms, chiefly protons from hydrogen atoms, are trapped by the planet's magnetic field. The particles within the belt, whose axis is the magnetic axis of the planet, spiral along magnetic field lines, traveling backward and forward between reflections which occur as they approach the magnetic poles. This motion produces synchrotron emission from the particles. The particles are either captured from the solar wind or are formed by collisions between cosmic rays and atoms or ions in the planet's outer atmosphere. The Earth, Jupiter, Saturn, Uranus, and Neptune are all known to possess radiation belts. The magnetic field of Mercury appears to be too weak to sustain belts. The radiation belts of Jupiter are many times more intense than the Van Allen radiation belts of the Earth and pose a threat to spacecraft systems in the vicinity of the planet.
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