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Astronuc
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Sep29-07, 08:12 AM
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There are some numbers here, but the article doesn't say anything about specific location, i.e. how far from the surface of the sun the data are reported.
http://www.esa.int/esaCP/SEMB49QJNVE_index_0.html

Solar flares would ostensibly have particle densities on the order of the chromosphere and corona.

See - RELEASE OF HELIUM FROM CLOSED-FIELD REGIONS OF THE SUN
http://www.journals.uchicago.edu/ApJ.../61619.web.pdf

The Structure of the Sun
http://www.sec.noaa.gov/Curric_7-12/Chapter_2.pdf