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E3C10

What does the 304A solar parameter measure?

Select	Answer
A	The solar wind velocity at 304 degrees from the solar equator, correlated to solar activity
B	The solar emission at 304 GHz, correlated to X-Ray flare levels
C	The ratio of X-Ray flux to radio flux, correlated to sunspot number
D	UV emissions at 304 angstroms, correlated to solar flux index

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