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Un-interrupted Sun-as-a-star Helioseismic Observations over Multiple Solar Cycles

Published online by Cambridge University Press:  27 November 2018

Kiran Jain Open the ORCID record for Kiran Jain [Opens in a new window] ,
Sushanta Tripathy ,
Frank Hill ,
David Salabert ,
Rafael A. García  and
Anne-Marie Broomhall
Kiran Jain
Affiliation:
National Solar Observatory, 3665 Discovery Drive, Boulder, CO 80303, USA email: kjain@nso.edu, stripathy@nso.edu, fhill@nso.edu
Sushanta Tripathy
Affiliation:
National Solar Observatory, 3665 Discovery Drive, Boulder, CO 80303, USA email: kjain@nso.edu, stripathy@nso.edu, fhill@nso.edu
Frank Hill
Affiliation:
National Solar Observatory, 3665 Discovery Drive, Boulder, CO 80303, USA email: kjain@nso.edu, stripathy@nso.edu, fhill@nso.edu
David Salabert
Affiliation:
IRFU, CEA, Universit Paris-Saclay, F-91191 Gif-sur-Yvette, France Laboratoire AIM, CEA/DRF-CNRS-Universit Paris Diderot, F-91191 Gif-sur-Yvette, France
Rafael A. García
Affiliation:
IRFU, CEA, Universit Paris-Saclay, F-91191 Gif-sur-Yvette, France Laboratoire AIM, CEA/DRF-CNRS-Universit Paris Diderot, F-91191 Gif-sur-Yvette, France
Anne-Marie Broomhall
Affiliation:
Department of Physics, University of Warwick, Coventry, CV4 7AL, UK Institute of Advanced Study, University of Warwick, Coventry, CV4 7HS, UK
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Abstract

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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 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.

Keywords

Sun: activitySun: helioseismologySun: oscillationsSun: interior

References

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