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How strong a solar flare needs to be to be easily seen on a projected white light image?

The first and the storgest solar flare so far is detected by simply projecting the Sun with optics on a paper. The flare was so intense that it was brighter than the photosphere beneath it. Nowadays ...
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Is solar wind positively charged?

Many times I heared that the solar wind consists of protons and alpha particles. The both are positively charged, but are there electrons in solar wind?