Dates to Remember

  • Abstracts Due – Feb. 19, 2010
  • Pre-Registration – April 16, 2010
  • Hotel Reservations – April 16, 2010

Keystone Information

Science Program

Solar and Anthropogenic Impacts on Earth:
The Current Solar Minimum and Predictions
for Future Decades

We are pleased to announce the 2010 SORCE Science Meeting, motivated by the solar irradiance observations by NASA’s Solar Radiation and Climate Experiment (SORCE). Relative to the past three solar minimum epochs of the space era (1976, 1986, and 1996) the current solar minimum (2008-2009) between solar cycles 23 and 24 is unusually prolonged, with record numbers of sunspot-free days, record low solar polar magnetic fields, and record high levels of cosmic ray flux. Evidence is accumulating for broad ranging terrestrial responses to the current inactivity of the Sun.

The lack of global warming since 2002 can be attributed in part to declining solar irradiance, which, together with La Niña cooling, has cancelled much of recent anthropogenic warming. Reduced solar UV irradiance and corresponding lower ozone levels may be obscuring the recovery from anthropogenic ozone depletion by CFCs. In the upper atmosphere and ionosphere, temperatures are anomalously cool and densities are reduced relative to previous solar minima; but these changes may also be related to accumulated greenhouse gas cooling in the upper atmosphere.

The format for this workshop consists of invited and contributed presentations for three sessions concerning the solar irradiance and its variability and the current state of Earth’s climate and atmosphere. We encourage your participation and hope that you will share this announcement with colleagues.

Key questions to be addressed include:

Keystone Falls
  • Are spectral and total solar irradiance levels lower now than during past minima, and how much will they increase during solar cycle 24?
  • Are we entering a new prolonged period of anomalously low activity such as the Dalton Minimum in the early 1800s?
  • Can we identify anomalous behavior in the solar dynamo and surface flux transport during the current minimum?
  • How are heliospheric changes altering incident cosmic ray fluxes and the Earth’s near-space environment?
  • Can we reliably discern the terrestrial signatures of the current solar inactivity – at the surface, in the stratosphere and in space weather?
  • What does understanding of the present (in the context of the past) infer for the future variability of Earth’s environment?
  • Motivated by these questions, the 2010 SORCE Meeting will address the current state of and future expectations for the integrated Sun-Earth system.


The agenda for this interactive meeting consists of invited and contributed oral and poster presentations. Please submit all abstracts by Feb. 19, 2010 to Vanessa George via email ( Please limit your abstract to 250 words, include your affiliation, what session you would like to be included in, and whether you prefer an oral or poster presentation.

If you have any questions please contact the 2010 SORCE Meeting Organizing Committee:

Download the Abstract Form : (.doc, .pdf) 

SORCE Science Meeting