NDLI: The Variation of Solar Wind Correlation Lengths Over Three Solar Cycles

Content Provider	Springer Nature Link
Author	Wicks, R. T. Owens, M. J. Horbury, T. S.
Copyright Year	2010
Abstract	We present the results of a study of solar wind velocity and magnetic field correlation lengths over the last 35 years. The correlation length of the magnetic field magnitude λ $_{\|B\|}$ increases on average by a factor of two at solar maxima compared to solar minima. The correlation lengths of the components of the magnetic field $\lambda_{B_{XYZ}}$ and of the velocity $\lambda_{V_{YZ}}$ do not show this change and have similar values, indicating a continual turbulent correlation length of around 1.4×10$^{6}$ km. We conclude that a linear relation between λ $_{\|B\|}$, VB $^{2}$, and Kp suggests that the former is related to the total magnetic energy in the solar wind and an estimate of the average size of geoeffective structures, which is, in turn, proportional to VB $^{2}$. By looking at the distribution of daily correlation lengths we show that the solar minimum values of λ $_{\|B\|}$ correspond to the turbulent outer scale. A tail of larger λ $_{\|B\|}$ values is present at solar maximum causing the increase in mean value.
Starting Page	191
Ending Page	198
Page Count	8
File Format	PDF
ISSN	00380938
Journal	Solar Physics
Volume Number	262
Issue Number	1
e-ISSN	1573093X
Language	English
Publisher	Springer Netherlands
Publisher Date	2010-02-13
Publisher Place	Dordrecht
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Extraterrestrial Physics, Space Sciences Meteorology/Climatology Astrophysics and Astroparticles
Content Type	Text
Resource Type	Article
Subject	Astronomy and Astrophysics Space and Planetary Science

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