Proton resonant firehose instability: Temperature anisotropy and fluctuating field constraints
نویسندگان
چکیده
منابع مشابه
Wind/SWE observations of firehose constraint on solar wind proton temperature anisotropy
[1] The proton resonant firehose instability may arise in collisionless plasmas in which the proton velocity distribution is approximately bi-Maxwellian with Tkp/T?p > 1, where ? and k denote directions relative to the background magnetic field B . Linear theory and onedimensional simulations predict that enhanced field fluctuations from the proton resonant firehose instability impose a constra...
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The proton temperature anisotropy in the solar wind is known to be constrained by the theoretical thresholds for pressure-anisotropy-driven instabilities. Here, we use approximately 1x10;{6} independent measurements of gyroscale magnetic fluctuations in the solar wind to show for the first time that these fluctuations are enhanced along the temperature anisotropy thresholds of the mirror, proto...
متن کاملTemperature Isotropization in Solar Flare Plasmas due to the Electron Firehose Instability
The isotropization process of a collisionless plasma with an electron temperature anisotropy along an external magnetic field (T e ‖ ≫ T e ⊥, ‖ and ⊥ with respect to the background magnetic field) and isotropic protons is investigated using a particle-in-cell (PIC) code. Restricting wave growth mainly parallel to the external magnetic field, the isotropization mechanism is identified to be the ...
متن کاملModified temperature-anisotropy instability thresholds in the solar wind.
The proton and electron temperature anisotropies in the solar wind are constrained by the instability thresholds for temperature-anisotropy-driven kinetic plasma instabilities. The modifications to the marginal instability conditions from accounting for the influence of damping connected with the collisional effects in the solar wind plasma are calculated for right- and left-handed polarized pa...
متن کاملElectron Firehose instability and acceleration of electrons in solar flares
An electron distribution with a temperature anisotropy T‖/T⊥ > 1 can lead to the Electron Firehose instability (Here ‖ and ⊥ denote directions relative to the background magnetic field B0). Since possible particle acceleration mechanisms in solar flares exhibit a preference of energizing particles in parallel direction, such an anisotropy is expected during the impulsive phase of a flare. The p...
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ژورنال
عنوان ژورنال: Journal of Geophysical Research: Space Physics
سال: 1998
ISSN: 0148-0227
DOI: 10.1029/98ja01174