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- W54974968 abstract "We investigate the evaluation of global cosmic ray cutoff rigidities for the past 2000 years. The paper puts its focus on changes in the strength of the geomagnetic dipole and in its position inside the Earth. Possible effects are discussed for a cutoff rigidity fiducial mark that is especially suited for the evaluation of production rates of cosmogenic nuclides in the Earth’s atmosphere. One of the factors responsible for the long-term changes in the production rates of cosmogenic nuclides in the Earth’s atmosphere is secular variations in the geomagnetic field. The shielding effect of the Earth’s magnetic field and its variation must therefore be taken into account for a proper identification of solar and heliospheric variability in the indirect information provided by cosmogenic nuclides stored in terrestrial archives. Geomagnetic effects on cosmic rays are usually described by the concept of cutoff rigidities [8]. The state-of-the-art technique for the determination of cutoff rigidities is the calculation of particle trajectories in a magnetic field model representing the Earth’s magnetic field at a specific time. For a specified location (geogr. latitude �0 and longitude �0), and a specified arrival direction (zenith angle �, azimuth angle �), allowed and forbidden trajectories are determined by numerically integrating the equation of motion of charged particles as a function of particle rigidity. The effective cutoff rigidity Rc,eff(�0 ,� 0 ,� ,�) takes into account geomagnetic filtering effects in the penumbra region [2]. Today the Earth’s magnetic field is described by magnetic field models which include internal and external sources, as e.g. the International Geomagnetic Reference Field (IGRF) [5]. Unfortunately, such magnetic field models are not available for the past. Simple dipole field models are therefore often used for palaeogeophysical studies. The global magnetic dipole moment and the location of the North geomagnetic pole are thereby determined from archaeometric information." @default.
- W54974968 created "2016-06-24" @default.
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- W54974968 date "2003-07-01" @default.
- W54974968 modified "2023-09-24" @default.
- W54974968 title "Global Cosmic Ray Cutoff Rigidities Over the Past 2000 Years" @default.
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