scholarly journals Pitch Angle Dependence of Electron and Ion Flux Changes During Local Magnetic Dipolarization Inside Geosynchronous Orbit

2020 ◽  
Vol 125 (2) ◽  
Author(s):  
T. Motoba ◽  
S. Ohtani ◽  
M. Gkioulidou ◽  
D. G. Mitchell ◽  
A. Y. Ukhorskiy ◽  
...  
Keyword(s):  
Pitch Angle ◽  
Ion Flux ◽  
Geosynchronous Orbit ◽  
Angle Dependence

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

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.

Scattering-angle dependence of signal/background ratio of inner-shell electron excitation loss in EELS

1983 ◽  
Vol 41 ◽  
pp. 390-391
Author(s):  
T. Oikawa ◽  
M. Inoue ◽  
T. Honda ◽  
Y. Kokubo
Keyword(s):  
Energy Loss ◽  
Electron Excitation ◽  
Heavy Elements ◽  
Background Intensity ◽  
Light Elements ◽  
Energy Analyzer ◽  
High Background ◽  
Scattering Angle ◽  
Angle Dependence ◽  
Shell Electron

EELS allows us to make analysis of light elements such as hydrogen to heavy elements of microareas on the specimen. In energy loss spectra, however, elemental signals ride on a high background; therefore, the signal/background (S/B) ratio is very low in EELS. A technique which collects the center beam axial-symmetrically in the scattering angle is generally used to obtain high total intensity. However, the technique collects high background intensity together with elemental signals; therefore, the technique does not improve the S/B ratio. This report presents the experimental results of the S/B ratio measured as a function of the scattering angle and shows the possibility of the S/B ratio being improved in the high scattering angle range.Energy loss spectra have been measured using a JEM-200CX TEM with an energy analyzer ASEA3 at 200 kV.Fig.l shows a typical K-shell electron excitation edge riding on background in an energy loss spectrum.

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