Category Archives: Solar

Nature Unbound VI – Centennial to millennial solar cycles

by Javier

Summary: Holocene climate has been affected in different periods by several centennial to millennial solar cycles. The ~ 1000-year Eddy solar cycle seems to have dominated Holocene climate variability between 11,500-4,000 years BP, and in the last two millennia, where it defines the Roman, Medieval, and Modern warm periods. The ~ 208-year de Vries solar cycle displays strong modulation by the ~ 2400-year Bray solar cycle, both in its cosmogenic isotope signature and in its climatic effects. The Centennial, and Pentadecadal solar cycles are observable in the last 400-year sunspot record, and they are responsible for the present extended solar minimum that started in 2008.

Continue reading

Impact of the ~ 2400 yr solar cycle on climate and human societies

*by Javier

The role of solar variability on climate change, despite having a very long scientific tradition, is currently downplayed as a climatic factor within the most popular hypothesis for climate change.

Continue reading

Are we headed for a new solar minimum?

by Judith Curry

We can conclude that the evidence provided is sufficient to justify a complete updating and reviewing of present climate models to better consider these detected natural recurrences and lags in solar processes. – Jorge Sánchez-Sesma

Continue reading

Climate Dialogue: influence of the sun on climate

by Judith Curry

Climate Dialogue has a very interesting discussion What will happen during a new Maunder Minimum?  This is my favorite Climate Dialogue so far.

Continue reading

IPCC: solar variations don’t matter

Nevertheless, even if there is such decrease in the solar activity, there is a high confidence that the TSI RF variations will be much smaller in magnitude than the projected increased forcing due to GHG. – IPCC AR5 Chapter 8

Continue reading

Effects of solar variability on climate

by Judith Curry

Two new workshop reports provide  insights into what we know and don’t know about the effects of solar variability on climate.

Continue reading

Evidence of nearby supernovae affecting life on Earth

by Judith Curry

A very provocative paper by Henrik Svensmark has been published today by the Royal Astronomical Society.

Continue reading