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Cosmic Radiation and Cosmogenic Isotope Production

Sarkozi, Peter (2019) Cosmic Radiation and Cosmogenic Isotope Production. Bachelor's Thesis, Physics.


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In this project, radiocarbon data from the second half of the 20th century and the 21st century was analyzed. Through fitting a simple quadratic function plus sine waves, the bomb curve was eliminated along with periodic variations corresponding to the Sun's magnetic cycle or seasonal changes (where found). A set of residuals was produced and examined for peaks based on the standard deviations of the respective datasets. Significant jumps were found in the spring of 1979 for two measurement sites (Vermunt, Schauinsland), and in 1971 for one site (Fruholmen). The offset between the 11 year Schwabe cycle and the solar components of the obtained fits was examined, yielding average delays of 6.9 years (Fruholmen), 6.6 years (Wellington), 2.9 years (Jungfraujoch) and 3.1 years (Schauinsland). The nominally 22 year periodicity of the Hale cycle was found in the Jungfraujoch dataset. Furthermore an approximately 6.5 year periodicity was found in the data from Wellington and Vermunt. For all obtained sine fits, we presented the amplitudes and angular frequencies.

Item Type: Thesis (Bachelor's Thesis)
Supervisor nameSupervisor E mail
Degree programme: Physics
Thesis type: Bachelor's Thesis
Language: English
Date Deposited: 02 Jul 2019
Last Modified: 11 Jul 2019 12:14

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