Pitch-Angle Dependence of First-Order Fermi Acceleration at Shock Fronts

1966 ◽  
Vol 145 ◽  
pp. 616 ◽  
Author(s):  
J. R. Jokipii
Keyword(s):  
Pitch Angle ◽  
Fermi Acceleration ◽  
First Order ◽  
Angle Dependence ◽  
Shock Fronts

scholarly journals Cross-field transport and pitch-angle anisotropy of solar energetic particles in MHD turbulence

2016 ◽  
Vol 2 ◽  
pp. 63-65 ◽  
Author(s):  
F. Fraschetti
Keyword(s):  
Pitch Angle ◽  
Turbulence Models ◽  
Energetic Particles ◽  
Solar Energetic Particles ◽  
Mhd Turbulence ◽  
First Order ◽  
Angle Dependence ◽  
Inhomogeneous Turbulence ◽  
Angle Scattering

Abstract. Recent modelling of solar energetic particles (SEPs) propagation through the heliospheric turbulence, also discussed in this workshop, has investigated the role of the pitch-angle scattering and the perpendicular transport in spreading particles in heliolongitude, as shown by multi-spacecraft measurements (STEREO A/B, ACE, SOHO, etc.) at 1 AU in various energy ranges. In some events the first-order pitch-angle anisotropy of the particles distribution is not-negligible. We calculate the average perpendicular displacement due to the gradient/curvature drift in an inhomogeneous turbulence accounting for pitch-angle dependence for two MHD turbulence models: (a) 3-D isotropic, (b) anisotropic as conjectured by Goldreich-Sridhar. We find in both cases that the drift scales as (1 − μ2)2 with the cosine of pitch-angle μ, in contrast with previous models for transport of SEPs. This result can impact the models of propagation of SEPs through the heliosphere.

scholarly journals Mars photoelectron energy and pitch angle dependence on intense lower atmospheric dust storms

2014 ◽  
Vol 119 (7) ◽  
pp. 1689-1706 ◽  
Author(s):  
Shaosui Xu ◽  
Michael W. Liemohn ◽  
David L. Mitchell ◽  
Michael D. Smith
Keyword(s):  
Pitch Angle ◽  
Dust Storms ◽  
Atmospheric Dust ◽  
Angle Dependence ◽  
Photoelectron Energy

First-order Fermi acceleration in solar flares as a mechanism for the second-step acceleration of prompt protons and relativistic electrons

1983 ◽  
Vol 267 ◽  
pp. 433 ◽  
Author(s):  
T. Bai ◽  
H. S. Hudson ◽  
R. M. Pelling ◽  
R. P. Lin ◽  
R. A. Schwartz ◽  
...  
Keyword(s):  
Solar Flares ◽  
Second Step ◽  
Relativistic Electrons ◽  
Fermi Acceleration ◽  
First Order
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