The Solar Cycle in the Extreme Ultraviolet

Details The Solar Cycle in the Extreme Ultraviolet The Solar Cycle in the Extreme Ultraviolet

Dec 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993aas...183.2506p&link_type=abstract

American Astronomical Society, 183rd AAS Meeting, #25.06; Bulletin of the American Astronomical Society, Vol. 25, p.1331

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Scientific paper

We present Pioneer Venus Orbiter observations of the solar EUV flux. The 13 years of measurements cover the last part of Solar Cycle 21 and the majority of Solar Cycle 22. The Ipe flux is a direct measure of the solar EUV flux that correlated extremely well with earth based measurements until the onset of Solar Cycle 22. We demonstrate this correlation with the 10.7 cm. radio flux and ionospheric conditions. Our measurements show that Solar Cycle 22 was one of the most active ever recorded. The Ipe flux is a yield-weighted integration over wavelengths from 100 Angstroms to 1300 Angstroms. It is dominated by emission in L_alpha lambda 1216, with roughly 50% of the flux coming from the remaining wavelengths. Other EUV proxy measurements are compared to the Ipe flux.

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