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tl;dr they're a bit too small for SOHO and Stereo and only visible in EUV The "campfires" are described as a few hundred km across, The smallest of those campfires are about the size of a European country, according to Berghmans. which means that from Earth (or SOHO or Stereo) they will subtend from one to a few seconds of arc (a few micro-...

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