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댓글 6건 조회 2,430회 작성일 21-04-13 13:22

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Joan Feynman deduced in the 1970s that the long-term averages of solar wind speed correlated with geomagnetic activity. The solar wind reaches Earth with a velocity typically around 400 km/s, a density of around 5 ions/cm3, and a magnetic field intensity of around 2–5 nT (for comparison, Earth's surface field is typically 30,000–50,000 nT). Earth is constantly immersed in the solar wind, a flow of magnetized hot plasma (a gas of free electrons and positive ions) emitted by the Sun in all directions, a result of the two-million-degree temperature of the Sun's outermost layer, the corona. Due to physics, the magnetic disturbance on the ground due to the main current almost cancels out, so most of the observed effect of auroras is due to a secondary current, the auroral electrojet. https://payidpokies1.com

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