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NASA sounding rocket instrument spots signatures of long-sought small solar flares
Like most solar sounding rockets, the second flight of the FOXSI instrument - short for Focusing Optics X-ray Solar Imager - lasted 15 minutes, with just six minutes of data collection. These kinds of temperatures are generally produced in solar flares, powerful bursts of energy. One possible solution to the coronal heating problem is the constant eruption of tiny solar flares in the solar atmosphere, so small that they can't be directly detected.
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