SOHO Satellite

The Solar and Heliospheric Observatory (SOHO) satellite has provided the most detailed picture to date of the nature of the solar wind. Hydrogen and helium make up 99.9 percent of the wind, but the sensitive mass spectrometer aboard SOHO can make measurements of the trace constituents. A group of instruments aboard are collectively called the Charge, Element, and Isotope Analysis System (CELIAS). They have detected isotopes of silicon, sulfur, calcium,shromium, iron and nickel in the solar wind. They also detected isotopes of neon and argon which had not been detected by earlier satellites, but had been observed from the moon twenty years before during the Apollo lunar landings.

太阳与日球探测器（SOHO）卫星迄今提供了关于日冕风最详细的图像。氢和氦构成了风的99.9%，但SOHO上搭载的敏感质谱仪可以测量痕量成分。卫星上的一组仪器被统称为电荷、元素和同位素分析系统（CELIAS）。它们在日冕风中检测到了硅、硫、钙、铬、铁和镍的同位素。它们还检测到了氖和氩的同位素，这些同位素此前尚未被早期卫星检测到，但在二十年前的阿波罗登月任务中曾从月球上观测到。

The isotopes provide clues about where the solar wind originates in the dynamic structure of the sun. They can help model the transfer mechanisms from the sun's surface into the corona.

同位素能帮助揭示日冕中太阳风的起源位置，从而有助于建模从太阳表面到日冕的传输机制。