Abundance Calculations of Neon Isotopes in the Predicted Lifetime of the Sun
University of Sharjah（沙迦大学）；Sharjah Academy for Astronomy, Space Sciences and Technology（沙迦天文学、空间科学与技术学院）；Arab Union for Astronomy and Space Sciences（阿拉伯天文学与空间科学联盟）；The University of Jordan（约旦大学）
Mohamed A. Alkhajeh, Mashhoor A. Al-Wardat, Awni M. Kasawneh, Mohammed H. Talafha
备注：
Accepted for publication in Jordan Journal of Physics (JJP)
The elemental abundances of neon isotopes provide valuable insights into stellar evolution and nucleosynthesis. In this study, we calculate the abundances of the isotopes 18Ne, 19Ne, 20Ne, 21Ne, and 22Ne across the five principal evolutionary phases of the Sun: hydrogen burning, lively old age, onset of rapid growth and red giant, helium burning and helium exhaustion. The calculations were carried out using the open-source nucnet-tools package, developed by the Webnucleo Group at Clemson University. Initial isotope abundances were adopted from standard proto-solar compositions. Their evolution was computed under static hydrostatic burning conditions, assuming constant temperature and density within each phase. The results show that the stable isotopes 20Ne and 22Ne remain dominant throughout the Sun's lifetime, whereas the short-lived isotopes 18Ne and 19Ne decay rapidly during or shortly after the hydrogen-burning phase. The predictions obtained for the helium burning and exhaustion phases provide quantitative neon-isotope abundances that are not extensively reported in the existing literature. These results offer valuable reference values for future studies of solar and stellar evolution, nucleosynthetic pathways, and isotopic modeling.
Solar activity in all its varied manifestations is driven by the magnetic field. Particularly important for many purposes are two global quantities, the Sun's total and open magnetic flux, which can be computed from sunspot number records using models. Such sunspot-driven models, however, do not take into account the presence of magnetic flux during grand minima, such as the Maunder minimum. Here we present a major update of a widely used simple model, which now takes into account the observation that the distribution of all magnetic features on the Sun follows a single power law. The exponent…
An updated picture of pre-solar history from short-lived radioactive isotopes and inferences on the birth of the Sun
Konkoly Observatory, HUN-REN CSFK（孔科利天文台，匈牙利研究与教育网络科学中心）；MTA Centre of Excellence（匈牙利科学院卓越中心）；University of Bayreuth（拜罗伊特大学）；Los Alamos National Laboratory（洛斯阿拉莫斯国家实验室）；Istituto Nazionale di Fisica Nucleare - Laboratori Nazionali del Sud（意大利国家核物理研究所南方实验室）；Institute of Physics and Astronomy, ELTE Eötvös Loránd University（罗兰大学物理与天文学研究所）；School of Physics and Astronomy, Monash University（蒙纳士大学物理与天文学院）
Long-term forcing of Sun's coronal field, open flux and cosmic ray modulation potential during grand minima, maxima and regular activity phases by the solar dynamo mechanism
