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A mechanism for the dependence of sunspot group tilt angles on cycle strength

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A mechanism for the dependence of sunspot group tilt angles on cycle strength.pdf (449.4Kb)
Author
Işık, Emre
Type
Article
Date
2015-11-01
Language
en_US
Metadata
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Abstract
The average tilt angle of sunspot groups emerging throughout the solar cycle determines the net magnetic flux crossing the equator, which is correlated with the strength of the subsequent cycle. I suggest that a deep-seated, non-local process can account for the observed cycle-dependent changes in the average tilt angle. Motivated by helioseismic observations indicating cycle-scale variations in the sound speed near the base of the convection zone, I determined the effect of a thermally perturbed overshoot region on the stability of flux tubes and on the tilt angles of emerging flux loops. I found that 5-20 K of cooling is sufficient for emerging flux loops to reproduce the reported amplitude of cycle-averaged tilt angle variations, suggesting that it is a plausible effect responsible for the nonlinearity of the solar activity cycle.
Subject
Sun: activity
Sun: interior
Sun: magnetic fields
Sunspots
Magnetic-Flux Tubes
Convection Zone
Solar-Cycle
Base
Sun
Intensification
Overshoot
Envelope
Models
URI
https://doi.org/10.1088/2041-8205/813/1/L13
https://hdl.handle.net/11413/2021
Collections
  • Makaleler / Articles [293]
  • Scopus Publications [724]
  • WoS Publications [1016]

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İstanbul Kültür University

Hakkında |Politika | Kütüphane | İletişim | Send Feedback | Admin

Istanbul Kültür University, Ataköy Campus E5 Karayolu Üzeri Bakırköy 34158, İstanbul / TURKEY
Copyright © İstanbul Kültür University

Creative Commons Lisansı
IKU Institutional Repository, Creative Commons Alıntı-GayriTicari-Türetilemez 4.0 Uluslararası Lisansı ile lisanslanmıştır.

Designed by  UNIREPOS