Constraints on long-term changes in solar activity from the range of variability of cosmogenic radionuclide records

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dc.contributor.authorMuscheler, Ren_AU
dc.contributor.authorHeikkilä, UEen_AU
dc.date.accessioned2012-04-18T03:13:37Zen_AU
dc.date.available2012-04-18T03:13:37Zen_AU
dc.date.issued2011-09-03en_AU
dc.date.statistics2012-04-18en_AU
dc.description.abstractThere is a variety of different cosmogenic radionuclide-based reconstructions of solar activity variations for the past. Especially the longer-term changes and the absolute levels of past solar activity are uncertain as it is illustrated by the differences between these reconstructions. On the one hand there are differences between 10Be and 14C records that are commonly used as proxies for the varying solar modulation of galactic cosmic rays. On the other hand estimates of past changes in the geomagnetic shielding also include relatively large uncertainties. Here, we concentrate on variations in cosmogenic radionuclide records on time scales of 50 to 500 yr. We show that these are to a large extent independent of the geomagnetic field intensity. The range of variability of cosmogenic radionuclide records allows us to set constraints about long-term changes in solar activity. These records indicate that present solar activity levels were reached or exceeded regularly in the past. © Author(s) 2011.en_AU
dc.identifier.citationMuscheler, R. and Heikkilä, U., (2011). Constraints on long-term changes in solar activity from the range of variability of cosmogenic radionuclide records. Astrophysics and Space Sciences Transactions, 7(3), 355-364. doi:10.5194/astra-7-355-2011en_AU
dc.identifier.govdoc3670en_AU
dc.identifier.issn1810-6528en_AU
dc.identifier.issue3en_AU
dc.identifier.journaltitleAstrophysics and Space Sciences Transactionsen_AU
dc.identifier.pagination355-364en_AU
dc.identifier.urihttp://dx.doi.org/10.5194/astra-7-355-2011en_AU
dc.identifier.urihttp://apo.ansto.gov.au/dspace/handle/10238/4149en_AU
dc.identifier.volume7en_AU
dc.language.isoenen_AU
dc.publisherCopernicus Publicationsen_AU
dc.subjectSolar activityen_AU
dc.subjectRadioisotopesen_AU
dc.subjectCosmologyen_AU
dc.subjectBeryllium 10en_AU
dc.subjectCarbon 14en_AU
dc.subjectCosmic ray spectrometersen_AU
dc.titleConstraints on long-term changes in solar activity from the range of variability of cosmogenic radionuclide recordsen_AU
dc.typeJournal Articleen_AU
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