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Revisiting Solar and Heliospheric 1.3-Year Signals during 1970 – 2007

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Abstract

We revisit the 1.3-year (yr) signals observed on the Sun, in the interplanetary space, and in the Earth’s magnetosphere to study the coupling among signals from the three regions for about 40 years (1970 – 2007) covering the three solar cycles 21, 22, and 23. For this, we make dynamic spectra of datasets including three different regions. From this, we estimate the peak frequency around 1.3 yr for each region and the corresponding band power. We found that coherent power only appears during 1987 – 1995 and the coherent behavior is found only in the interplanetary space and Earth, not in the Sun. Although the solar surface magnetic field shows significant power around 1.3 yr, their peak frequencies are statistically different from those of the outer regions, which make us dismiss the existence of coherence among the three regions. But it is notable that the peaks in band power corresponding to the 1.3-yr period are clearly simultaneous in the interplanetary space and Earth.

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Acknowledgements

This work was supported by the ‘Study of near-Earth effects by CME/HSS’ project of Korea Astronomy and Space Science Institute (KASI). We are appreciating anonymous referee for constructive comments which are to improve significantly our manuscript. We acknowledge use of NASA/GSFC’s Space Physics Data Facility’s OMNIWEB service, and OMNI data. Synoptic magnetogram map and its extension to the coronal height of NSO/Kitt Peak used here are archived and supported by National Science Foundation (NSF) of US through its National Space Weather Program (NSWP), and by NASA under the Upper Atmosphere Research Program. We also acknowledge the use of the coronal green line emission data which is contributed by Slovak Astronomical Institute, and archived from National Geophysical Data Center (NGDC).

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Correspondence to J. Hwang.

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Cho, IH., Hwang, J. & Park, YD. Revisiting Solar and Heliospheric 1.3-Year Signals during 1970 – 2007. Sol Phys 289, 707–719 (2014). https://doi.org/10.1007/s11207-013-0365-x

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  • DOI: https://doi.org/10.1007/s11207-013-0365-x

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