Physics
Scientific paper
Nov 2005
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005ssrv..121..165z&link_type=abstract
Space Science Reviews, Volume 121, Issue 1-4, pp. 165-188
Physics
10
Sun: Flares, Sun: Acceleration, Sun: Electric Field, Particle Motion: Trajectory, Gyration, Drifts, Energy Spectra
Scientific paper
Electron and proton acceleration by a super-Dreicer electric field is further investigated in a non-neutral reconnecting current sheet (RCS) with a variable plasma density. The tangential B z and transverse magnetic field components B x are assumed to vary with the distances x and z from the X nullpoint linearly and exponentially, respectively; the longitudinal component (a ‘guiding field’) is accepted constant. Particles are found to gain a bulk of their energy in a thin region close to the X nullpoint where the RCS density increases with z exponentially with the index λ and the tangential magnetic field B x also increases with z exponentially with the index α. For the RCS with a constant density (λ = 0), the variations of the tangential magnetic field lead to particle power-law energy spectra with the spectral indices γ1 being dependent on the exponent α as: γ_1 = 1 + 1/2α for protons and γ_1 = 1+ 1/α for electrons in a strong guiding field (β > 10-2) and γ_1 =frac {1} 2 (1 +1/α) for electrons in a moderate or weak guiding field (β > 10-4). For the RCS with an exponential density increase in the vicinity of the X nullpoint (λ≥ 0) there is a further increase of the resulting spectral indices γ that depends on the density exponent index λ as γ = γ_1 +λ/2α for protons and for electrons in weaker guiding fields and as γ = γ_1 + λ/α for electrons in stronger guiding fields. These dependencies can explain a wide variety (1.5 10) of particle spectral indices observed in solar flares by the variations of a magnetic field topology and physical conditions in a reconnecting region. This can be used as a diagnostic tool for the investigation of the RCS dynamics from the accelerated particle spectra found from hard X-ray and microwave emission.
Gordovskyy Mykola
Zharkova Valentina V.
No associations
LandOfFree
The Effects of Transverse Magnetic Field and Density Variations on the Particle Energy Spectra in a Reconnecting 3D Current Sheet does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with The Effects of Transverse Magnetic Field and Density Variations on the Particle Energy Spectra in a Reconnecting 3D Current Sheet, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and The Effects of Transverse Magnetic Field and Density Variations on the Particle Energy Spectra in a Reconnecting 3D Current Sheet will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-1733352