TY - JOUR

T1 - The role of deviation of magnetic field direction on the beaming angle

T2 - Extending of beaming angle theory

AU - Kalaee, Mohammad Javad

AU - Katoh, Yuto

N1 - Publisher Copyright:
© 2016 Elsevier Ltd.
Copyright:
Copyright 2017 Elsevier B.V., All rights reserved.

PY - 2016/5/1

Y1 - 2016/5/1

N2 - In the beaming angle theory, the magnetic field direction is assumed perpendicular to the normal boundary, and the prediction of this theory, from beaming angle is base on the Jones' formula. We investigate the effect of deviation the magnetic field direction respect to normal boundary direction. In this study, we present new conditions that under these conditions two modes, extraordinary and ordinary modes waves can match. Also, we show for these cases the beaming angle does not correspond to Jones' formula. This effect leads to the angles larger and smaller than the angle estimated by Jones' formula. This effect on the mode conversion process becomes important in a case where local fluctuations in the direction of the density gradient vector or the magnetic field direction are observed. By comparing the beaming angle from observations with the beaming angles resulting from different δΦ, we showed a δΦ about 3 to 5° are necessary in consistence with observation.

AB - In the beaming angle theory, the magnetic field direction is assumed perpendicular to the normal boundary, and the prediction of this theory, from beaming angle is base on the Jones' formula. We investigate the effect of deviation the magnetic field direction respect to normal boundary direction. In this study, we present new conditions that under these conditions two modes, extraordinary and ordinary modes waves can match. Also, we show for these cases the beaming angle does not correspond to Jones' formula. This effect leads to the angles larger and smaller than the angle estimated by Jones' formula. This effect on the mode conversion process becomes important in a case where local fluctuations in the direction of the density gradient vector or the magnetic field direction are observed. By comparing the beaming angle from observations with the beaming angles resulting from different δΦ, we showed a δΦ about 3 to 5° are necessary in consistence with observation.

KW - Beaming angle

KW - Density gradient

KW - Jones' formula

KW - Magnetic field direction

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U2 - 10.1016/j.jastp.2016.02.021

DO - 10.1016/j.jastp.2016.02.021

M3 - Article

AN - SCOPUS:84959441125

VL - 142

SP - 35

EP - 42

JO - Journal of Atmospheric and Solar-Terrestrial Physics

JF - Journal of Atmospheric and Solar-Terrestrial Physics

SN - 1364-6826

ER -