Observational Confirmation of the Sun's CNO Cycle
Measurements on rays from a solar flare in Active Region 10039 on 23 July 2002 with the RHESSI spacecraft spectrometer indicate that the CNO cycle occurs at the solar surface in electrical discharges along closed magnetic loops. At the two feet of the loop H+ ions are accelerated to energy levels that surpass Coulomb barriers for the reactions. First X-rays appear along the discharge path. Next annihilation of -particles from 13N and 15O (t1/2=10 m and 2 m) produce bright spots of 0.511 MeV at the loop feet. As 13C increases from -decay of 13N the reaction produces neutrons and then the 2.2 MeV emission line appears from n-capture on 1H. These results suggest that the CNO cycle changed the 15N/14N ratio in the solar wind and at the solar surface over geologic time and this ratio may contain an important historical record of climate changes related to sunspot activity.
M. Mozina et al., "Observational Confirmation of the Sun's CNO Cycle," Journal of Fusion Energy, vol. 25, pp. 141-144, Springer Verlag, Dec 2006.
The definitive version is available at http://dx.doi.org/10.1007/s10894-006-9003-z
Foundation for Chemical Research
University of Missouri--Rolla
Keywords and Phrases
Electric Discharges; Ions; Magnetic Field Effects; Reaction Kinetics; Spacecraft; Spectrometers; X Rays; Electrical Activity; Geologic Time; H-Fusion; Solar Flare; Solar Radiation; Γ-Rays; C-13.; Climate; CNO Cycle; N-15; Gamma rays
International Standard Serial Number (ISSN)
Article - Journal
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