HR: 0800h
AN: SH41A-1110    [Abstracts]
TI: Correlation Between Cosmic-Ray Intensity and Total Solar Irradiance during the last three Solar Cycles
AU: * Frohlich, C
EM: cfrohlich@pmodwrc.ch
AF: Physikalisch-Meteorologisches Observatorium Davos, World Radiation Center, Dorfstrasse 33, Davos Dorf, CH-7260 Switzerland
AU: Beer, J
EM: beer@eawag.ch
AF: Department of Surface Waters, EAWAG, Uberlandstrasse 133, Dubendorf, CH 8600 Switzerland
AU: Muscheler, R
EM: raimund@ucar.edu
AF: Climate and Global Dynamics Division - Paleoclimatology, NCAR, 1850 Table Mesa Drive, Boulder, CO 80305-3000 United States
AB: For reconstructions of the total solar irradiance (TSI) into the past it is important to understand the relation between the production of cosmogenic isotopes and TSI. The production rate is a function of the cosmic-ray intensity reaching the Earth, which is well represented by the neutron monitors. As theses data are available since well before the start of cycle 21 a direct comparison with the PMOD composite of TSI can be performed. For the correlation different lags of the cosmic-ray intensity for the odd and even cycles have to be taken into account, as well as different amplitudes. Both the cosmic-ray intensity and TSI are modulated by the solar activity related magnetic fields. While the cosmic ray intensity depends only on the open fields a major question is still how the open fields are related to the weak fields in the network on the Sun which seem to be responsible for the solar-cycle modulation of TSI. The much stronger fields on the solar surface on the other hand are responsible for the short-term variation related to sunspots and faculae. The implications of this comparison for the understanding of the relation between the production of cosmogenic isotopes and TSI will be discussed.
DE: 7536 Solar activity cycle (2162)
DE: 7537 Solar and stellar variability (1650)
DE: 7538 Solar irradiance
SC: SPA-Solar and Heliospheric Physics [SH]
MN: Fall Meeting 2005