Please use this identifier to cite or link to this item: http://hdl.handle.net/2248/3510
Title: Records of the past solar activity in terrestrial and meteorite archives
Authors: Bhandari, N
Keywords: Radio telescope
Geomagnetic field
Meteorites
Issue Date: 1998
Publisher: Astronomical Society of India
Citation: BASI, Vol. 26, pp. 167 - 171
Abstract: Time series of cosmogenic radioisotopes in tree rings, sedimentary deposits on sea beds and ice cores form the polar ice caps show a large number of periodicities. Many of them can be attributed to changes in galactic cosmic ray flux due to solar modulation and in this way the past activity of the sun can be determined. However, since the effects of the geomagnetic field and the climatic processes are superimposed on these records, these periodicities, particularly their amplitudes, may not be wholly due to solar activity changes. The meteorite records, acquired outside the terrestrial influence, reflect the solar modulation more faithfully. Specifically, a century scale periodicity, related to the Gleissberg cycle, is supported by the observed 44Ti activity variation in meteorites.
URI: http://hdl.handle.net/2248/3510
Appears in Collections:BASI Publications

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