Abstract
The solar flux at 220±5 nm has been measured from a balloon near 40 km in September of 1975, 1976, and 1977. The average value of the unattenuated flux corrected to 1 AU is 4.43×1012 photons/(cm² s nm) for near solar minimum conditions. Comparison with other measurements suggests that the solar flux at 220±5 nm may vary by as much as 25% over a solar sunspot cycle. This conclusion is strongly dependent on a few points and is not inconsistent with a variation below 10%.
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