Please use this identifier to cite or link to this item: https://apo.ansto.gov.au/dspace/handle/10238/4149
Title: Constraints on long-term changes in solar activity from the range of variability of cosmogenic radionuclide records
Authors: Muscheler, R
Heikkilä, U
Keywords: Solar activity
Radioisotopes
Cosmology
Beryllium 10
Carbon 14
Cosmic ray spectrometers
Issue Date: 3-Sep-2011
Publisher: Copernicus Publications
Citation: Muscheler, 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-7-355-2011
Abstract: There 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.
Gov't Doc #: 3670
URI: http://dx.doi.org/10.5194/astra-7-355-2011
http://apo.ansto.gov.au/dspace/handle/10238/4149
ISSN: 1810-6528
Appears in Collections:Journal Articles

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