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| Titel |
Long-Term Modulation of Galactic Cosmic Rays |
| VerfasserIn |
Konstantin Herbst, Raimund Muscheler, Florian Adolphi, Andreas Nilsson |
| Konferenz |
EGU General Assembly 2016
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| Medientyp |
Artikel
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| Sprache |
en
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 18 (2016) |
| Datensatznummer |
250136802
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| Publikation (Nr.) |
 EGU/EGU2016-17924.pdf |
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| Zusammenfassung |
| Galactic cosmic rays (GCRs) are charged particles which are created within as
well as outside our galaxy. Propagating through interstellar space they eventually
are passing through the heliosphere where they become subjected to modulation
processes such as diffusion, convection, drifts as well as adiabatic energy changes.
Thereby, the modulation strongly depends on the level of solar activity. Hence,
changes in solar activity are reflected in the GCR flux observed in the Earth’s vicinity.
Ground-based instruments such as ionization chambers and neutron monitors provide
a continuous record of the cosmic ray intensity, and thus solar activity, back to
1936. Moreover, the GCR flux at Earth results in the atmospheric production of
so-called cosmogenic radionuclides (e.g. 10Be and 14C). Being stored in natural
archives like ice-sheets and tree rings, cosmogenic radionuclides can thus preserve
information about solar activity variations over thousands of years. Here we will give an
update of the solar modulation reconstruction over the past 2000 years with focus
on the most recent knowledge about the local interstellar spectrum (LIS) and the
related 10Be and 14C production rates depending on solar and geomagnetic shielding.
Furthermore, the updated record will be compared to the revised sunspot record. |
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