2014/04/08 by R. Bruno, R Bruno, L Trenchi +1 · 2 citations
Computer Science · Physics and Astronomy · #Atmospheric sciences #Classical mechanics #Frequency dependence #Ionosphere and magnetosphere dynamics #Kinetic energy #Mechanics #Nuclear magnetic resonance #Nuclear physics #Physics #Plasma #Solar Radiation and Photovoltaics #Solar and Space Plasma Dynamics #Solar wind #astro-ph.SR #physics.space-ph
paper · pdf · doi:10.1088/2041-8205/787/2/l24
8 pages, 3 figures, Accepted on Astrophysical Journal Letters
arxiv created 2014/04/08 · openalex publication_date 2014/05/14 · arxiv updated 2015/06/19 · openalex created_date 2016/06/24 · openalex updated_date 2026/08/06
We investigate the radial dependence of the spectral break separating the inertial from the dissipation range in power density spectra of interplanetary magnetic field fluctuations, between 0.42 and 5.3 AU, during radial alignments between MESSENGER and WIND for the inner heliosphere and between WIND and ULYSSES for the outer heliosphere. We found that the spectral break moves to higher and higher frequencies as the heliocentric distance decreases. The radial dependence of the corresponding wavenumber is of the kind κ b ∼ R −1.08 , in good agreement with that of the wavenumber derived from the linear resonance condition for proton cyclotron damping. These results support conclusions from previous studies which suggest that a cyclotron-resonant dissipation mechanism must participate in the spectral cascade together with other possible kinetic noncyclotron-resonant mechanisms.