期刊
ASTROPHYSICAL JOURNAL LETTERS
卷 741, 期 1, 页码 -出版社
IOP PUBLISHING LTD
DOI: 10.1088/2041-8205/741/1/L19
关键词
magnetic fields; magnetohydrodynamics (MHD); methods: statistical; plasmas; turbulence
资金
- US DoE [DE-FG02-07ER54932, DE-SC0003888, DE-SC0001794]
- NSF [PHY-0903872]
- NSF Center for magnetic Self-organization in Laboratory and Astrophysical Plasmas at University of Wisconsin-Madison
- Texas Advanced Computing Center (TACC) at the University of Texas at Austin under the NSF [TG-PHY080013N]
- NASA
- Direct For Mathematical & Physical Scien
- Division Of Physics [0903872] Funding Source: National Science Foundation
The question is addressed as to what extent incompressible magnetohydrodynamics can describe random magnetic and velocity fluctuations measured in the solar wind. It is demonstrated that distributions of spectral indices for the velocity, magnetic field, and total energy obtained from high-resolution numerical simulations of magnetohydrodynamic turbulence are qualitatively and quantitatively similar to solar wind observations at 1 AU. Both simulations and observations show that in the inertial range the magnetic field spectrum E-b is steeper than the velocity spectrum E-v with E-b greater than or similar to E-v and that the magnitude of the residual energy E-R = E-v - E-b decreases nearly following a k(perpendicular to)(-2) scaling.
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