On the Cascade-Dissipation Balance in Astrophysical Plasmas
arxiv(2023)
摘要
The differential heating of electrons and ions by turbulence in weakly
collisional magnetized plasmas and the scales at which such energy dissipation
is most effective are still debated. Using a large data sample measured in the
Earth's magnetosheath by the Magnetospheric Multiscale mission and the
coarse-grained energy equations derived from the Vlasov-Maxwell system we find
evidence of a balance over two decades in scales between the energy cascade and
dissipation rates. The decline of cascade rate at kinetic scales (in contrasts
with a constant one in the inertial range), is balanced by an increasing ion
and electron heating rates, estimated via the pressure-strain. Ion scales are
found to contribute most effectively to ion heating, while electron heating
originates equally from ion and electron scales. These results can potentially
impact current understanding of particle heating in turbulent magnetized
plasmas as well as their theoretical and numerical modeling.
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