What was the Probable State of the Solar Chromosphere and Corona During the Maunder Minimum?

Philip G. Judge [judge@ucar.edu], High Altitude Observatory, NCAR, Boulder, Colorado; and Steven H. Saar, Harvard Smithsonian Center for Astrophysics, Cambridge, Massachusetts.

The Maunder Minimum (1645-1715) is the onlydocumented period in which a correlation betweenclimate and solar magnetic activity has beenfound. Very few sunspots were observed, nearly allof them in one hemisphere, and yet 10Be ice corerecords indicate modulation of cosmic rays byheliospheric magnetic fields. For its own sake,and also to try to understand more concerning thesolar magnetic field in this period, we ask, whatwas the state of the Sun's chromosphere and coronaduring this period?  To address this question, wehave carefully compared solar UV emission from theSoHO spacecraft with similar data of particular"flat activity" stars from the Hubble SpaceTelescope, and solar X-ray emission from the SNOEspacecraft with data from the ROSAT archive. Assuming that flat activity dwarf stars are in thestellar equivalent of a solar Maunder Minimum, weconclude that the radiative output of the Sun'schromosphere and corona were similar to thoseobserved under conditions close to current solarminima. We speculate on the nature of the solarmagnetic field during the Maunder minimum, basedon these results, and discuss some directions forfurther research.