Sky science
Van Allen Radiation Belts
Direct answer
Van Allen Radiation Belts: The Van Allen Radiation Belts are toroidal regions of energetic charged particles trapped by Earth’s magnetic field.
They are Earth’s principal trapped-radiation zones.
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At a glance
- Found in
- Astronomy & Skywatching
- Related
- Heliopause, Planetary Magnetosphere, Planetary Albedo, Bond Albedo
They are Earth’s principal trapped-radiation zones.
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The story behind Van Allen Radiation Belts
Explorer 1 data led James Van Allen’s team to identify the belts in 1958.
A one-minute story
The Wandering Stars
How the moving planets were watched, named and found, and what a transit is.
Why Van Allen Radiation Belts matters
Van Allen Radiation Belts matter for spacecraft electronics, astronaut exposure, and magnetospheric physics.
Van Allen Radiation Belts in practice: an example
Satellite operators design orbits and shielding around expected radiation environments.
Where readings of Van Allen Radiation Belts go wrong
The belts are neither solid rings nor uniform hazards at every altitude.
Sources and editorial method
Research references used for this entry include:
- NASA Science: The Sun - NASA reference for solar structure, activity, the solar wind, and heliophysics.
- NASA Science: Solar System Exploration - NASA overview of planets, moons, small bodies, rings, and the structure of the Solar System.
- Source
- The Great Almanac Dictionary
- Category
- Astronomy & Skywatching
- Last updated
- 2026-09-26
Map Earth’s radiation belts
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Common questions
What are the Van Allen Radiation Belts?
The Van Allen Radiation Belts are toroidal regions of energetic charged particles trapped by Earth’s magnetic field.
What is the history of the Van Allen Radiation Belts?
Explorer 1 data led James Van Allen’s team to identify the belts in 1958.
What do people get wrong about the Van Allen Radiation Belts?
The belts are neither solid rings nor uniform hazards at every altitude.
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