摘要
The sun, the host star of the Earth and human beings, is still mysterious in various aspects. One mystery is the formation of the million-degree corona and the solar wind, which creates a bubble called heliosphere in the galactic interstellar medium. As a typical G-type star on the main sequence, the sun is the only star in the universe that mankind can have an opportunity to stare in detail and touch through in-situ measurements.
