Abstract
The paper presents a more extensive comparison of Extreme Ultraviolet (EUV) irradiances during AE-E (1977–1980), Pioneer Venus (1979–1992) and SEM/SOHO (1996 onwards) with other solar indices than has been discussed previously. For long-term changes (solar cycle), all indices had similar trends and inter-correlations were high, so that any one could serve as a proxy for the other. For intermediate time-scales (monthly means), only Lα, F10 (2800 MHz) and Mg ii had reasonably high correlations with EUV. The 2695 MHz radio emission also had a high correlation. For daily values, data for many indices are intermittant and these cannot serve as proxies. Again, only Lα, F10 (and 2695 MHz), Mg ii stand out as possible proxies for EUV, particularly during intervals of strong 27-day sequences.
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Kane, R. Correlation of Solar Indices with Solar euv Fluxes. Solar Physics 207, 17–40 (2002). https://doi.org/10.1023/A:1015546123823
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DOI: https://doi.org/10.1023/A:1015546123823