Electron Acceleration in Solar Flares by Fast‐Mode Waves: Coulomb Collisions
نویسندگان
چکیده
منابع مشابه
ACCELERATION AND ENRICHMENT OF 3He IN IMPULSIVE SOLAR FLARES BY ELECTRON FIREHOSE WAVES
A new mechanism for acceleration and enrichment of He during impulsive solar flares is presented. Low-frequency electromagnetic plasma waves excited by the Electron Firehose Instability (EFI) can account for the acceleration of ions up to 1 MeV amu−1 energies as a single stage process. The EFI arises as a direct consequence of the free energy stored in a temperature anisotropy (T e ‖ > T e ⊥) o...
متن کاملHe IN IMPULSIVE SOLAR FLARES BY ELECTRON FIREHOSE WAVES
A new mechanism for acceleration and enrichment of He during impulsive solar flares is presented. Low-frequency electromagnetic plasma waves excited by the Electron Firehose Instability (EFI) can account for the acceleration of ions up to 1 MeV amu energies as a single stage process. The EFI arises as a direct consequence of the free energy stored in a temperature anisotropy (T e ‖ > T e ⊥) of ...
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Context. Stochastic acceleration is thought to be a key mechanism in the energization of solar flare electrons. Aims. We study whether stochastic acceleration can reproduce the observed soft-hard-soft evolution of the spectral features of the hard X-ray emitted by suprathermal electrons. We pay special attention to the effects of particle trapping and escape. Methods. The Fokker-Planck equation...
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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We investigate the non-linear interaction of a strong Gravitational Wave with the plasma during the collapse of a massive magnetized star to form a black hole, or during the merging of neutron star binaries (central engine). We found that under certain conditions this coupling may result in an efficient energy space diffusion of particles. We suggest that the atmosphere created around the centr...
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ژورنال
عنوان ژورنال: The Astrophysical Journal
سال: 1998
ISSN: 0004-637X,1538-4357
DOI: 10.1086/305127