Abstract
The present work investigates the acceleration of test particles, relevant to the solar-wind problem, in balanced
and imbalanced magnetohydrodynamic turbulence (terms referring here to turbulent states possessing zero and
nonzero cross helicity, respectively). These turbulent states, obtained numerically by prescribing the injection
rates for the ideal invariants, are evolved dynamically with the particles. While the energy spectrum for balanced
and imbalanced states is known, the impact made on particle heating is a matter of debate, with different
considerations giving different results. By performing direct numerical simulations, resonant and nonresonant
particle accelerations are automatically considered and the correct turbulent phases are taken into account. For
imbalanced turbulence, it is found that the acceleration rate of charged particles is reduced and the heating
rate diminished. This behavior is independent of the particle gyroradius, although particles that have a stronger
adiabatic motion (smaller gyroradius) tend to experience a larger heating.
Original language | English |
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Article number | 021101 |
Journal | Physical Review E |
Volume | 90 |
Issue number | 2 |
DOIs | |
Publication status | Published - 11 Aug 2014 |
Bibliographical note
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Profiles
-
Bogdan Teaca
- Faculty Research Centre in Fluid and Complex Systems - Assistant Professor (Academic)
Person: Teaching and Research