Hostname: page-component-7bb8b95d7b-pwrkn Total loading time: 0 Render date: 2024-09-12T11:57:59.190Z Has data issue: false hasContentIssue false
  • English
  • Français

Asymmetry in Solar Torsional Oscillation

Published online by Cambridge University Press:  27 November 2018

B Lekshmi Open the ORCID record for B Lekshmi [Opens in a new window] ,
Dibyendu Nandy  and
H M Antia
B Lekshmi
Affiliation:
Center of Excellence in Space Sciences India, IISER Kolkata, WB-741246, India email: [email protected]
Dibyendu Nandy
Affiliation:
Center of Excellence in Space Sciences India, IISER Kolkata, WB-741246, India email: [email protected] Dept. of Physical Sciences, IISER Kolkata, WB-741246, India email: [email protected]
H M Antia
Affiliation:
Tata Institute of Fundamental Research, Mumbai email: [email protected]
Rights & Permissions [Opens in a new window]

Abstract

Core share and HTML view are not available for this content. However, as you have access to this content, a full PDF is available via the ‘Save PDF’ action button.

Solar torsional oscillations are migrating bands of slower and faster than average rotation, which are thought to be related to the Sun’s magnetic cycle. We perform the first long-term study (16 years) of hemispherical asymmetry in solar torsional oscillation velocity using helioseismic data. We explore the spatial and temporal variation of North-South asymmetry using zonal flow velocities obtained from ring diagram analysis of the Global Oscillation Network Group (GONG) Doppler images. We find a strong correlation between the asymmetries of near-surface torsional oscillation with magnetic flux and sunspot number, with the velocity asymmetry preceding in both the cases. We speculate that the asymmetry in torsional oscillation velocity may help in predicting the hemispherical asymmetry in the sunspot cycle.

Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 13 , Symposium S340: Long-term Datasets for the Understanding of Solar and Stellar Magnetic Cycles , February 2018 , pp. 11 - 12
Copyright
Copyright © International Astronomical Union 2018 

References

Howe, R., Hill, F., Komm, R., et al. 2011, in Journal of Physics Conference Series, Vol. 271, Journal of Physics Conference Series, 012074Google Scholar
Corbard, T., Toner, C., Hill, F., et al. 2003, in ESA Special Publication, Vol. 517, GONG+ 2002. Local and Global Helioseismology: the Present and Future, ed. H. Sawaya-Lacoste, 255–258Google Scholar
Hill, F., Bolding, J., Toner, C., et al. 2003, in ESA Special Publication, Vol. 517, GONG+ 2002. Local and Global Helioseismology: the Present and Future, ed. H. Sawaya-Lacoste, 295–298Google Scholar
Komm, R., González Hernández, I., Howe, R., & Hill, F., 2015, SoPh, 290, 1081Google Scholar
Sheeley, N. R. Jr, 1966, ApJ, 144, 723Google Scholar
Dikpati, M., de Toma, G., & Gilman, P. A., 2006, GrL, 33, L05102Google Scholar