词条 日冕物质抛射（CME）
描述: 日冕物质抛射（或CME）是指太阳（以及其他类似恒星）向日球层（或其他恒星的星球层）中爆炸性喷射太阳等离子体及其磁场。CME是一种磁场爆发活动，通常与太阳耀斑有关。CME是物质的物理上的抛射，与仅限于可见辐射的“耀斑”不同。CME在结构、密度和速度方面变化很大，撞击地球的CME可能引发严重的地磁风暴。
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A Coronal Mass Ejection
图注： A burst of solar material can be seen erupting from the Sun in this view, illustrating a coronal mass ejection (CME)—a large eruption of plasma and magnetic field from the Sun’s outer atmosphere, or corona. These CMEs are caused by magnetic explosions in the Sun's corona. During a CME, huge amounts of electrically charged particles are launched into space at great speeds, carrying part of the Sun’s magnetic field with them. These events are driven by changes in the Sun’s magnetic structure and release vast clouds of hot gas that travel outward into the solar system. When a CME moves through space, it can interact with a planet’s magnetic field and atmosphere, sometimes creating spectacular auroras or, in strong cases, interfering with artificial satellites and power systems.
CMEs are often associated with a temporary brightening of the region of the Sun where the CME originated. This is known as a solar flare. Stars other than the Sun can also have CMEs and flares.
This image was taken by NASA's Solar Dynamics Observatory (SDO). This is a space mission to monitor the Sun. The image here is taken at a special wavelength which partially ionised helium emits strongly at.
来源： NASA/Goddard/SDO
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License: PD 公共领域 图标
