Solar Kinetic Energy and Cross Helicity Spectra
نویسندگان
چکیده
منابع مشابه
Magnetic Helicity and Energy Spectra of a Solar Active Region
We compute magnetic helicity and energy spectra of the solar active region NOAA 11158 during 11–15 February 2011 at 20 southern heliographic latitude using observational photospheric vector magnetograms. We adopt the isotropic representation of the Fourier-transformed two-point correlation tensor of the magnetic field. The sign of magnetic helicity turns out to be predominantly positive at all ...
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We adopt an isotropic representation of the Fourier-transformed two-point correlation tensor of the magnetic field for estimating magnetic energy and helicity spectra as well as current helicity spectra of individual active regions and the change of their spectral indices with the solar cycle. The departure of the spectral index of current helicity from 5/3 is analyzed, and it is found that it ...
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Magnetic field amplification in astrophysics ultimately requires an understanding of magnetohydrodynamic turbulence. Kinetic helicity has long been known to be important for large scale field growth in forced MHD turbulence, and has been recently demonstrated numerically to be asymptotically consistent with slow mean field dynamo action in a periodic box. Here we show numerically that the magne...
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1 NORDITA, AlbaNova University Center, Roslagstullsbacken 23, SE-10691 Stockholm, Sweden 2 Department of Astronomy, AlbaNova University Center, Stockholm University, SE 10691 Stockholm, Sweden 3 Space Research Institute of the Russian Academy of Sciences Profsoyuznaya 84/32, Moscow 117997, Russia 4 Moscow Institute of Physics and Technology, State University, Institutsky lane 9, Dolgoprudny 141...
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Kinetic energy (KE) spectra derived from global high-resolution atmospheric simulations from the Model for PredictionAcross Scales (MPAS) are presented. The simulations are produced using quasi-uniform global Voronoi horizontal meshes with 3-, 7.5-, and 15-km mean cell spacings. KE spectra from the MPAS simulations compare well with observations and other simulations in the literature and posse...
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ژورنال
عنوان ژورنال: The Astrophysical Journal
سال: 2018
ISSN: 2041-8213
DOI: 10.3847/2041-8213/aad337