Connecting Inferred Solar Microvariability Over the Past 200ky With Observed Microvariability of 582 Solar-Class Stars from the ESA Hipparcos Program

Aden Meinel [] and Marjorie Meinel, University of Arizona and Jet Propulsion Laboratory; Lennart Lindegren, Lund University, Sweden; and Karen O'Flaherty, ESA/ESTEC.

            Microsurges of proxy temperature during the D/O events in the GRIP and GISP2 data show signatures compatible with microvariations of solar luminosity over the past 200ky. The ESA Hipparcos Astrometric Satellite Photometric Annex provides evidence that all solar class stars are microvariables. The Hipparcos statistics for 582 solar class stars show microvariations of sufficient magnitude to trigger abrupt millennial-scale temperature surges in the environmental temperature. We present evidence that a microsurge of solar luminosity could serve as the trigger for the abrupt rises and terminations to the fine proxy temperature structure in the GRIP and GISP2 chronologies. We present the statistics to permit correlation of the microvariability of solar class stars to the implied distribution of microvariability amplitude of the Sun during he 200 ky . This evidence leads to the conclusion that the Sun has been unusually quiet during the current integlacial maximum.