Van Allen Probes

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Graphic representing the various Heliophysics disciplines; Sun, Earth, Space Weather, Near-Earth Space and the Magnetosphere. Science Mission Directorate
Understanding the Sun, Heliosphere, and Planetary Environments as a single connected system is a goal of the Heliophysics Research Program.


Artist concept of space weather showing an active Sun with flares and a CME in the upper right, the Earth in the lower right with types of technology affected by space weather to the lower left; satellites, airplanes, the ISS and ground-based electrical lines. Studying the Sun-Earth connection.
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Mission Statement

The Van Allen Probes (formerly known as the Radiation Belt Storm Probes (RBSP)) were designed to help us understand the sun’s influence on Earth and near-Earth space by studying the Earth’s radiation belts on various scales of space and time.

The instruments on NASA’s Living With a Star Program’s (LWS) Van Allen Probes will provide the measurements needed to characterize and quantify the plasma processes that produce very energetic ions and relativistic electrons. The Van Allen Probes are part of the broader LWS program whose missions were conceived to explore aspects of the connected sun-Earth system that directly affect life and society. Van Allen Probe instruments will measure the properties of charged particles that comprise the Earth’s radiation belts, the plasma waves that interact with them, the large-scale electric fields that transport them, and the particle-guiding magnetic field.

The two Van Allen Probe spacecraft have nearly identical eccentric orbits. The orbits cover the entire radiation belt region and the two spacecraft lap each other several times over the course of the mission. The Van Allen Probes in-situ measurements discriminate between spatial and temporal effects, and compare the effects of various proposed mechanisms for charged particle acceleration and loss.


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Page Last Updated: April 25th, 2014
Page Editor: Holly Zell