Abstract
New methods of local helioseismology and uninterrupted time series of solar oscillation data from the Solar and Heliospheric Observatory (SOHO) have led to a major advance in our understanding of the structure and dynamics of active regions in the subsurface layers. The initial results show that large active regions are formed by repeated magnetic flux emergence from the deep interior, and that their roots are at least 50 Mm deep. The active regions change the temperature structure and flow dynamics of the upper convection zone, forming large circulation cells of converging flows. The helioseismic observations also indicate that the processes of magnetic energy release, flares and coronal mass ejections, might be associated with strong (1–2 km/s) shearing flows, 4–6 Mm below the surface.
This is a preview of subscription content, log in via an institution to check access.
Access this chapter
Tax calculation will be finalised at checkout
Purchases are for personal use only
Preview
Unable to display preview. Download preview PDF.
References
Birch, A. C., and Kosovichev, A. G.: 2000, Solar Phys. 192, 193.
Birch, A.C., Kosovichev, A. G., and Duvall, T. L., Jr.: 2004, Astrophys. J. 608, 580.
Couvidat, S., Birch, A. C., Kosovichev, A. G., and Zhao, J.: 2004, Astrophys. J. 607, 554.
Duvall, T. L., Jr., Jefferies, S. M., Harvey, J. W., and Pomerantz, M. A.: 1993, Nature 362, 430.
Dzifcakova, E., Kulinova, A., and Kosovichev, A. G.: 2003, in Sawaya-Lacoste, H. (ed.), Proceedings of SOHO 12/GONG+ 2002. Local and Global Helioseismology: The Present and Future, ESA SP-517, Noordwijk, p. 263.
Gizon, L., and Birch, A. C.: 2002, Astrophys. J. 571, 966.
Kosovichev, A. G.: 1996, Astrophys. J. 461, L55.
Kosovichev, A. G., and Duvall, T. L., Jr.: 1997, in Pijpers, F. P. et al. (ed.), SCORe’96: Solar Convection and Oscillations and their Relationship, Ast. Space Sci. Lib. vol. 225, p. 241.
Kosovichev, A. G., Duvall, T. L., Jr., and Scherrer, P. H.: 2000, Solar Phys. 192, 159.
Kosovichev, A. G., and Duvall, T. L., Jr.: 2003, Stephen L. Keil, and Sergey V. Avakyan (eds.), Innovative Telescopes and Instrumentation for Solar Astrophysics, Proceedings of the SPIE, vol. 4853, p. 327.
Kulinova, A., Dzifcakova, E., Duvall, T. L., Jr., and Kosovichev, A. G.: 2003, in Wilson, A. (ed.), Solar Variability as an Input to the Earth’s Environment, ESA SP-535, Noordwijk, p. 125.
Zhao, J., Kosovichev, A. G., and Duvall, T. L., Jr.: 2001, Astrophys. J. 557, 384.
Author information
Authors and Affiliations
Editor information
Editors and Affiliations
Rights and permissions
Copyright information
© 2007 Springer
About this chapter
Cite this chapter
Kosovichev, A.G., Duvall, T.L. (2007). Active Region Dynamics. In: Baker, D.N., Klecker, B., Schwartz, S.J., Schwenn, R., Von Steiger, R. (eds) Solar Dynamics and Its Effects on the Heliosphere and Earth. Space Sciences Series of ISSI, vol 22. Springer, New York, NY. https://doi.org/10.1007/978-0-387-69532-7_1
Download citation
DOI: https://doi.org/10.1007/978-0-387-69532-7_1
Received:
Accepted:
Publisher Name: Springer, New York, NY
Print ISBN: 978-0-387-69531-0
Online ISBN: 978-0-387-69532-7
eBook Packages: Physics and AstronomyPhysics and Astronomy (R0)