Physics
Scientific paper
May 2008
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008agusmsh53a..08k&link_type=abstract
American Geophysical Union, Spring Meeting 2008, abstract #SH53A-08
Physics
2162 Solar Cycle Variations (7536), 2427 Ionosphere/Atmosphere Interactions (0335), 2431 Ionosphere/Magnetosphere Interactions (2736), 2784 Solar Wind/Magnetosphere Interactions, 3369 Thermospheric Dynamics (0358)
Scientific paper
The 20 March - 16 April 2008 Whole Heliosphere Interval (WHI), part of the IHY program and cosponsored by the CAWSES program, offers a valuable opportunity to take an interdisciplinary look at the ground-state of the sun- Earth system during a time when solar and magnetic activity are at a 22-year low and the heliosphere is dominated by structures associated with open solar magnetic flux. The present solar minimum is unusually deep with monthly sunspot numbers dipping to values below those of the last 4 solar cycles and monthly magnetic activity at levels comparable to the quietest intervals over this same time period. During this time, the signatures of geomagnetic activity that usually dominate the geospace-upper atmosphere basic state are at a minimum allowing a clearer view of the coupling with the lower atmosphere. Magnetic activity that does occur is largely in response to high speed streams associated with open magnetic flux. Questions naturally arise as to the relationship between geospace-atmosphere coupling processes during solar minimum and those that may be operating throughout longer intervals during historical Grand Minima in solar activity. This talk provides an overview of first results on the state of geospace and coupled atmospheric regions during this interval with help and collaboration from campaign participants. Contact information for the observers, and details of additional presentations about the observation reported in this talk, will be provided to support preparations for an upcoming interdisciplinary analysis effort planned to span the entire Sun-Earth system.
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