Physics
Scientific paper
Aug 2011
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011jastp..73.1708w&link_type=abstract
Journal of Atmospheric and Solar-Terrestrial Physics, Volume 73, Issue 13, p. 1708-1714.
Physics
2
Scientific paper
The sunspot number (SSN), 10.7 cm radio flux (F10.7), MgII index, and SOHO/SEM EUV flux have been studied, using wavelet analysis, in order to describe how the first three parameters are related to EUV on scales of days to years. The wavelet transform decomposes the time series into series which captures variability on different temporal scales. The three proxies show weak correlation on time scales of days, thus they are of limited use in space weather when the day-to-day variability is considered. However, the underlying modulation due to the solar rotation and the solar activity cycle is so strong that there is a big influence on the daily values. Both F10.7 and MgII show a more persistent increase in correlation with scale than SSN and should be the preferred proxies. When a linear regression model is used for SEM/EUV the RMS error is about 26% lower, for the analysed period (1996-2010), for MgII compared to F10.7. However, when only the long term is considered (scale ≳1.4 yr) the RMS error is 20% larger when MgII is used compared to F10.7. This is caused by an offset between MgII and SEM that appears around the cycle 23 maximum. This offset is not seen between F10.7 and SEM. For space weather purposes, although none of the studied proxies works on a daily basis, the MgII index performs the best, but for the longer time scales F10.7 is the most suitable.
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