Other
Scientific paper
Dec 2006
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006agufmsh14a..03r&link_type=abstract
American Geophysical Union, Fall Meeting 2006, abstract #SH14A-03
Other
2149 Mhd Waves And Turbulence (2752, 6050, 7836), 2159 Plasma Waves And Turbulence, 2164 Solar Wind Plasma, 4490 Turbulence (3379, 4568, 7863), 7863 Turbulence (4490)
Scientific paper
We study the dependence of the variance directions of the magnetic field in the solar wind as a function of scale, radial distance, and Alfvénicity. The study resolves the question of why different studies have arrived at widely differing values for the maximum to minimum power (≍ 3:1 up to ≍ 20:1). This is due to the decreasing anisotropy with increasing time interval chosen for the variance, and is a direct result of the "spherical polarization" of the waves which follows from the near constancy of |B|. The reason for the magnitude preserving evolution is still unresolved. Moreover, while the long-known tendency for the minimum variance to lie along the mean field also follows from this view (as shown by Barnes many years ago), there is no theory for why the minimum variance follows the field direction as the Parker angle changes. We show that this turning is quite generally true in Alfvénic regions over a wide range of heliocentric distances. The fact that nonAlfvénic regions, while still showing strong power anisotropies, tend to have a much broader range of angles between the minimum variance and the mean field makes it unlikely that the cause of the variance turning is to be found in a turbulence mechanism. There are no obvious alternative mechanisms, leaving us with another intriguing puzzle.
Goldstein Michel L.
Roberts Daniel A.
No associations
LandOfFree
The Variance of Solar Wind Magnetic Fluctuations: Solutions and Further Puzzles does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with The Variance of Solar Wind Magnetic Fluctuations: Solutions and Further Puzzles, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and The Variance of Solar Wind Magnetic Fluctuations: Solutions and Further Puzzles will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-967090