Total solar irradiance during the last three cycles: What does the low present solar minimum tell us about long-term trends?

Details Total solar irradiance during the last three cycles: What does the low present solar minimum tell us about long-term trends? Total solar irradiance during the last three cycles: What does the low present solar minimum tell us about long-term trends?

Dec 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008agufmsh21c..05f&link_type=abstract

American Geophysical Union, Fall Meeting 2008, abstract #SH21C-05

Other

7536 Solar Activity Cycle (2162), 7537 Solar And Stellar Variability (1650), 7538 Solar Irradiance

Scientific paper

Since November 1978 a set of total solar irradiance (TSI) measurements from space is available, yielding a time series of 30 years. Presently, there are three TSI composites available, called PMOD, ACRIM and IRMB, which are all constructed from the same original data, but use different procedures to correct for long-term sensitivity changes. The PMOD composite is the only one which also corrects the early HF data for degradation. The results are not only important for solar radiometry from space, but they also provide a more reliable TSI during cycle 21. The comparison with a 3-component proxy model during this cycle allows also to expand it back to the minimum around 1975. Moreover, the PMOD composite uses VIRGO TSI data which cover the full cycle 23 with the same radiometers. This allows a direct comparison of the present minimum with the one in 1996 which can then be used to determine trends over a solar cycle. Comparison with the minima of the other two cycles allows some conclusions about the origin of long-term trends in TSI. The long- term variation of TSI must be due to another mechanism than the well established cycle variation, which is very similar to the variation of the spectral irradiance. This mechanism is most probably a global temperature change which is somewhat related to the amplitude of the cycle, that is to the total magnetic field.

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