By JR on Tuesday, June 21, 2011
Dr. Cornelis de Jager is a renowned Netherlands solar physicist, past General Secretary of the International Astronomical Union, and author of several peer-reviewed studies examining the solar influence upon climate. In response to the recent press release of three US studies indicating the Sun is entering a period of exceptionally low activity, Dr. de Jager references his publications of 2010 and prior indicating that this Grand Solar Minimum will be similar to the Maunder Minimum which caused the Little Ice Age, and prediction that this "deep minimum" will last until approximately the year 2100:
"The new episode is a deep minimum. It will look similar to the Maunder Minimum, which lasted from 1620 to 1720...This new Grand Minimum will last until approximately 2100."
A lecture by Dr. de Jager at UCAR shows that solar activity during the 20th century was at the highest levels of the past 900 years:
and shows solar UV activity (bottom graph below) was at the highest levels of the past 400 years in the latter portion of the 20th century: (UV is the most energetic portion of the solar spectrum, and varies much more than the Total Solar Irradiance (TSI). The IPCC and computer models only consider changes in TSI, ignoring the much more significant changes in UV)
and shows the amplication of solar variation via the cosmic ray theory of Svensmark et al:
leading to two possible mechanisms accounting for amplified solar effects upon the climate, neither of which is considered by the IPCC:
Recommended: Dr. de Jager's peer-reviewed paper Solar Activity and Its Influence on the Climate