- an emanation from the sun's corona consisting of a flow of charged particles, mainly electrons and protons, that interacts with the magnetic field of the earth and other planetary bodies.
- the constant stream of charged particles, esp protons and electrons, emitted by the sun at high velocities, its density and speed varying during periods of solar activity. It interacts with the earth's magnetic field, some of the particles being trapped by the magnetic lines of force, and causes auroral displays
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