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Evidence for a high‐latitude origin of lower latitude high‐speed wind
Author(s) -
Roberts D. Aaron,
Goldstein M. L.
Publication year - 1998
Publication title -
geophysical research letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.007
H-Index - 273
eISSN - 1944-8007
pISSN - 0094-8276
DOI - 10.1029/98gl00332
Subject(s) - harmonics , latitude , solar rotation , coronal hole , solar wind , physics , rotation (mathematics) , atmospheric sciences , low latitude , magnetic field , spectral line , wind speed , period (music) , geology , astrophysics , geophysics , coronal mass ejection , solar physics , meteorology , astronomy , geometry , mathematics , quantum mechanics , voltage , acoustics
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.