We analyze Sun-as-a-star observations spanning over solar cycles 22 -- 24 from the ground-based network BiSON and solar cycles 23 -- 24 collected by the space-based VIRGO and GOLF instruments on board the {\it SoHO} satellite. Using simultaneous observations from all three instruments, our analysis suggests that the structural and magnetic changes responsible for modifying the frequencies remained comparable between cycle 23 and cycle 24 but differ from cycle 22. Thus we infer that the magnetic layer of the Sun has become thinner since the beginning of cycle 23 and continues during the current cycle.
@article{arxiv.1805.05298,
title = {Un-interrupted Sun-as-a-star Helioseismic Observations over Multiple Solar Cycles},
author = {Kiran Jain and Sushanta Tripathy and Frank Hill and David Salabert and Rafael A. Garcia and Anne-Marie Broomhall},
journal= {arXiv preprint arXiv:1805.05298},
year = {2019}
}
Comments
4 pages including 2 figures and 1 table. To appear in the Proceedings of IAU Symposium 340 (Jaipur, February 2018)