Abstract
Solar magnetic indices are used to model the solar irradiance and ultimately to forecast it. However, the observation of such indices is generally limited to the Earth-facing hemisphere of the Sun. Seismic maps of the far side of the Sun have proven their capability to locate and track medium–large active regions at the non-visible hemisphere. We present here the possibility of using the average signal from these seismic far-side maps, combined with similarly calculated near-side maps, as a proxy to the full-Sun magnetic activity.
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Acknowledgements
The authors thank C. Lindsey for his extensive contribution to the NISP/GONG far-side pipeline and A. Malanushenko for the customization of part of the code. This work utilizes GONG data obtained by the NSO Integrated Synoptic Program (NISP), managed by the National Solar Observatory, which is operated by the Association of Universities for Research in Astronomy (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 project of international cooperation between ESA and NASA. This study includes data from the synoptic program at the 150-Foot Solar Tower of the Mt. Wilson Observatory. The Mt. Wilson 150-Foot Solar Tower is operated by UCLA, with funding from NASA, ONR, and NSF, under agreement with the Mt. Wilson Institute. We thank NOAA for the availability of the Mg ii and F10.7 data and LASP for the composite Lyα index. Part of the research has been supported by NASA grant NNH1AQ24I. Part of this work was supported by the Spanish National Research Plan under project AYA2010-17803.
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Solar Origins of Space Weather and Space Climate
Guest Editors: I. González Hernández, R. Komm, and A. Pevtsov
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González Hernández, I., Díaz Alfaro, M., Jain, K. et al. A Full-Sun Magnetic Index from Helioseismology Inferences. Sol Phys 289, 503–514 (2014). https://doi.org/10.1007/s11207-013-0339-z
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DOI: https://doi.org/10.1007/s11207-013-0339-z