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|Title:||Evolution of Intermittency in the Slow and Fast Solar Wind beyond the Ecliptic Plane||Authors:||Wawrzaszek, A.
Macek, W. M.
|Issue Date:||2015||Journal:||THE ASTROPHYSICAL JOURNAL||Number:||814||Issue:||2||First Page:||L19||Abstract:||We study intermittency as a departure from self-similarity of the solar wind magnetic turbulence and investigate the evolution with the heliocentric distance and latitude. We use data from the Ulysses spacecraft measured during two solar minima (1997-1998 and 2007-2008) and one solar maximum (1999-2001). In particular, by modeling a multifractal spectrum, we revealed the intermittent character of turbulence in the small-scale fluctuations of the magnetic field embedded in the slow and fast solar wind. Generally, at small distances from the Sun, in both the slow and fast solar wind, we observe the high degree of multifractality (intermittency) that decreases somewhat slowly with distance and slowly with latitude. The obtained results seem to suggest that generally intermittency in the solar wind has a solar origin. However, the fast and slow streams, shocks, and other nonlinear interactions can only be considered as the drivers of the intermittent turbulence. It seems that analysis shows that turbulence beyond the ecliptic plane evolves too slowly to maintain the intermittency with the distance and latitude. Moreover, we confirm that the multifractality and intermittency are at a lower level than in the ecliptic, as well as the existence of symmetry with respect to the ecliptic plane, suggesting that there are similar turbulent properties observed in the two hemispheres.||Acknowledgments:||We would like to thank the SWOOPS, SWICS, and MAG instruments teams of the ULYSSES mission for providing data. This work was supported by the European Community's Seventh Framework Programme ([FP7/2007-2013]) under grant agreement No. 313038/STORM. A.W. and W.M.M. were additionally supported by the National Science Center, Poland (NCN), through grant 2014/15/B/ST9/04782. M.M.E. acknowledges support from the Romanian Ministry of National Education, CNCS, UEFISCDI, project number PN-II-ID PCE-2012-4-0418, and from the Interuniversity Attraction Poles Programme initiated by the Belgian Science Policy Office (IAP P7/08 CHARM).||URI:||http://hdl.handle.net/20.500.12386/26449||URL:||https://iopscience.iop.org/article/10.1088/2041-8205/814/2/L19||ISSN:||0004-637X||DOI:||10.1088/2041-8205/814/2/L19||Bibcode ADS:||2015ApJ...814L..19W||Fulltext:||open|
|Appears in Collections:||1.01 Articoli in rivista|
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