Ionosphere and magnetosphere dynamics

Earth sits inside a vast magnetic bubble called the magnetosphere, which constantly deflects the stream of charged particles flowing from the Sun — the solar wind — while the ionosphere, a shell of electrically charged gas high in the atmosphere, responds to and shapes those same interactions. When the Sun releases bursts of energy, the resulting geomagnetic storms can compress the magnetosphere, energize particles in the radiation belts, disrupt satellite communications, and knock out power grids on the ground. Researchers are working to understand the precise mechanisms by which magnetic field lines from the Sun and Earth break and reconnect, releasing enormous amounts of energy almost instantaneously, and how plasma waves ferry that energy through different regions of near-Earth space. Accurate modeling of these processes remains an open challenge, both for fundamental physics and for improving the space weather forecasts that protect increasingly critical infrastructure in orbit and on the surface.

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Keywords

MagnetosphereIonosphereSolar WindGeomagnetic StormsRadiation BeltsMagnetic Reconnection