Evidence for a high-latitude origin of lower latitude high-speed wind

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Geophysical Research Letters - 1998 - Roberts - Evidence for a high‐latitude origin of lower latitude high‐speed wind.pdf (403.37 KB)

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https://agupubs.onlinelibrary.wiley.com/doi/abs/10.1029/98GL00332

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https://doi.org/10.1029/98GL00332
 http://hdl.handle.net/11603/30586

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UMBC Goddard Planetary Heliophysics Institute (GPHI)

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https://orcid.org/0000-0002-5317-988X

Date

1998-03-01

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journal articles
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Citation of Original Publication

Roberts, D. Aaron, and M. L. Goldstein. “Evidence for a High-Latitude Origin of Lower Latitude High-Speed Wind.” Geophysical Research Letters 25, no. 5 (1998): 595–98. https://doi.org/10.1029/98GL00332.

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This work was written as part of one of the author's official duties as an Employee of the United States Government and is therefore a work of the United States Government. In accordance with 17 U.S.C. 105, no copyright protection is available for such works under U.S. Law.
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Abstract

Using low-frequency spectra of the wind speed, density, and magnetic field strength, we show that the near-streamer belt solar wind at solar minimum exhibits many harmonics of fundamental frequencies corresponding to 26- and 34-day periods. Nearly all the low-frequency peaks in the spectra can be explained by these harmonics. The 26-day period is that of coronal hole rotation, and the 34-day period is naturally associated with the photospheric rotation period at about 70° S latitude. Thus we find evidence that the wind flow near 25° S comes from a region poleward of 60° S, consistent with magnetic field models.