HR: 17:35h
AN: GP54A-05    [Abstracts]
TI: Reconstruction of the Long-Term Irradiance Variations
AU: * Balmaceda, L
EM: balmaceda@mps.mpg.de
AF: Max-Planck-Institute for Solar System Research, Max-Planck-Str.2, Katlenburg-Lindau, 37191, Germany
AU: Krivova, N
EM: natalie@mps.mpg.de
AF: Max-Planck-Institute for Solar System Research, Max-Planck-Str.2, Katlenburg-Lindau, 37191, Germany
AU: Solanki, S
EM: solanki@mps.mpg.de
AF: Max-Planck-Institute for Solar System Research, Max-Planck-Str.2, Katlenburg-Lindau, 37191, Germany
AB: Solar irradiance variations have been recorded only since 1978. Clearly, there is a need to extend these records into the past in order to evaluate their possible influence on the Earth's climate. Here, a reconstruction of solar irradiance back to the Maunder minimum from the surface magnetic flux is presented. The reconstruction is based on a simple physical model that builds on the sunspot number records and sunspot areas where available. Since the sunspot area records generally consist of a compilation of data from multiple observatories, a proper cross-calibration is essential. The use of data of different sources directly combined can lead to errors in estimating the increase of solar irradiance during the past centuries. Thus, a brief description of the cross-calibration of sunspot areas is also presented.
DE: 7524 Magnetic fields
DE: 7537 Solar and stellar variability (1650)
DE: 7538 Solar irradiance
SC: Geomagnetism and Paleomagnetism [GP]
MN: 2007 Joint Assembly