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| Titel |
Solar modulation during the Holocene |
| VerfasserIn |
Friedhelm Steinhilber, Klaudia Herbst, Bernd Heber |
| Konferenz |
EGU General Assembly 2010
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| Medientyp |
Artikel
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| Sprache |
Englisch
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 12 (2010) |
| Datensatznummer |
250041299
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| Zusammenfassung |
| Here we compare several models of the local interstellar spectrum (LIS) often used
in literature. It is shown that the modulation potential Ï which parametrizes the
modulation of the LIS in the heliosphere, strongly depends on the LIS itself. Taking the
LIS-dependency of the modulation parameter into account, we first derive simple linear
equations to convert Ï between the different LIS. Higher polynomials only hardly
improve the conversion, and thus it is concluded that the conversion with linear
equations can be done with good results. Then, a long-term reconstruction of Ï
derived from a record of the cosmogenic radionuclide 10Be is investigated. This
reconstruction shows unphysical negative values during some periods. Besides
non-heliospheric effects such as the uncertainties in atmospheric mixing and in
paleo-geomagnetic field intensity, these negative values could also be due to the usage of a
too less intensive LIS. The next step will be to remove the non-heliospheric effects
from the Ï record, which then would probably allow to identify the "true" LIS. |
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