Abstract
Using SOHO/MDI and GONG observations we present time–distance deep-focusing measurements to examine the deeper layers of the solar convective zone. The constructed travel-time maps show 10 – 15 second perturbations at depths of 40 – 75 Mm around active region locations before their emergence to the solar surface. The majority of the active regions used in this study were the same as those used in the recent work published by Ilonidis, Zhao, and Kosovichev (Science 333, 993, 2011). In order to confirm the capability of time–distance measurements to detect emerging active regions, we used a technique similar to their time–distance scheme. Our measurements only in some cases show a similar travel-time anomaly. Additionally, we have shown that the technique utilized in our study can provide more spatial details of the emerging flux configurations.
This is a preview of subscription content, log in via an institution to check access.
Similar content being viewed by others
References
Birch, A.C., Braun, D.C., Fan, Y.: 2010, Astrophys. J. Lett. 723, L190.
Birch, A.C., Braun, D.C., Leka, K.D., Barnes, G., Javornik, B.: 2013, Astrophys. J. 762, 12.
Braun, D.C.: 2012, Science 336, 296.
Chang, H.-K., Chou, D.-Y., Sun, M.-T.: 1999, Astrophys. J. Lett. 526, L53.
Chou, D.-Y., Serebryanskiy, A.: 2002, Astrophys. J. Lett. 578, L157.
Duvall, T.L. Jr., Jefferies, S.M., Harvey, J.W., Pomerantz, M.A.: 1993, Nature 362, 430.
Duvall, T.L., Kosovichev, A.G., Scherrer, P.H., Bogart, R.S., Bush, R.I., Dec Forest, C., et al.: 1997, Solar Phys. 170, 63.
Fan, Y.: 2008, Astrophys. J. 676, 680.
Hill, F.: 1988, Astrophys. J. 333, 996.
Ilonidis, S., Zhao, J., Kosovichev, A.: 2011, Science 333, 993.
Komm, R., Howe, R., Hill, F.: 2012, Solar Phys. 277, 205.
Kosovichev, A., Duvall, T.L. Jr., Scherrer, P.H.: 2000, Solar Phys. 192, 159.
Libbrecht, K.G., Morrow, C.A.: 1991, In: Cox, A.N., et al. (eds.) Solar Interior and Atmosphere, Univ. Arizona Press, Tucson, 479.
Zharkov, S., Thompson, M.J.: 2008, Solar Phys. 251, 369.
Acknowledgements
This work utilized data obtained by the Global Oscillation Network Group (GONG) program, managed by the National Solar Observatory, which is operated by AURA, Inc. under a cooperative agreement with the National Science Foundation. The data were acquired by instruments operated by the Big Bear Solar Observatory, High Altitude Observatory, Learmonth Solar Observatory, Udaipur Solar Observatory, Instituto de Astrofísica de Canarias, and Cerro Tololo Interamerican Observatory. SOHO is a mission of international cooperation between NASA and ESA. Many thanks to A. Kosovichev for suggestions and useful comments which helped to improve the readability of the manuscript.
Author information
Authors and Affiliations
Corresponding author
Additional information
Solar Dynamics and Magnetism from the Interior to the Atmosphere
Guest Editors: R. Komm, A. Kosovichev, D. Longcope, and N. Mansour
Rights and permissions
About this article
Cite this article
Kholikov, S. A Search for Helioseismic Signature of Emerging Active Regions. Sol Phys 287, 229–237 (2013). https://doi.org/10.1007/s11207-013-0321-9
Received:
Accepted:
Published:
Issue Date:
DOI: https://doi.org/10.1007/s11207-013-0321-9