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How can plasma from the solar wind enter Earth’s magnetosphere?
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Ionosphere and magnetosphere
The layers of Earth's atmosphere, with a yellow line showing the air temperature at various heights.
Although the magnetosphere acts as a protective cavity that generally prohibits the direct entry of the solar wind, plasma from the solar wind can populate the magnetosphere's interior through two primary mechanisms:12
- Magnetic Reconnection: This process occurs when the Sun’s magnetic field, carried by the solar wind, becomes linked with the Earth’s magnetic field. This connection allows solar wind plasma to enter the magnetosphere and drives magnetospheric convection, which is more efficient than other interaction methods.23
- Leaking through the Magnetopause: Solar wind plasma can also leak directly through the magnetopause, which serves as the sunward boundary of the magnetosphere.2
Additionally, the magnetosphere is populated by charged particles originating from the Earth’s own ionosphere. Once inside, these particles can be energized and trapped, contributing to phenomena such as the Van Allen radiation belts and auroral displays.21