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Linear mode conversion of Langmuir/z-mode waves to radiation: Scalings of conversion efficiencies and propagation angles with temperature and magnetic field orientation
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10.1063/1.4793726
/content/aip/journal/pop/20/3/10.1063/1.4793726
http://aip.metastore.ingenta.com/content/aip/journal/pop/20/3/10.1063/1.4793726

Figures

Image of FIG. 1.
FIG. 1.

Schematic illustration of the simulation domain reproduced from Ref. 25 : Langmuir/z-mode waves are generated in region II, propagate through region III, and encounter an increasing density gradient in region IV. The plasma is assumed to be homogeneous in regions and inhomogeneous in region IV. Additional damping is imposed in region I. Here .

Image of FIG. 2.
FIG. 2.

Spatial dependence of the real part of the x, y, and z electric and magnetic wave fields (in arbitrary units) in region III of Figure 1 , where is in the z direction. Distances are measured in units of the input wavelength . This simulation is for , , , and . Note the different scales on the ordinate axes.

Image of FIG. 3.
FIG. 3.

Power spectra of the complex electric (top row) and magnetic (bottom row) fields from Figure 2 , in arbitrary units, in the x, y, and z directions (left to right), as functions of wave number kz ( ). These are for an incoming ( ) Langmuir/z wave with (green dashed lines) for for , , and . The outgoing ( ) Langmuir/z waves have (blue dashed lines) while the radio waves have (red dashed lines). Note the different scales on the ordinate axes.

Image of FIG. 4.
FIG. 4.

Energy and power conversion efficiencies as functions of q and θ for different , , and : (a) , (b) ) on logarithmic scales, (c) , and (d) . Colour coding is for different (red), (green), (blue). Curves for different , and 3 go from lowest to highest in (a) and left to right in (b) and (d).

Image of FIG. 5.
FIG. 5.

Scaled energy and power conversion efficiencies Σ and , respectively, as functions of q and scaled Θ for differing , based on Eqs. (38) and (40) and scaled against the results for and : (a) , (b) , (c) , and (d) . The colours, values of γ, and simulation parameters are as for Figure 4 .

Image of FIG. 6.
FIG. 6.

Energy and power conversion efficiencies as functions of q and θ for different ϕ, but constant , , , and : (a) , (b) ), (c) , and (d) . Colour coding is for different ϕ: (red), (blue), (green), (orange), and (purple).

Image of FIG. 7.
FIG. 7.

Scaled energy and power conversion efficiencies E and Es as functions of q and Θ for different , based on Eqs. (37)–(40) and scaled to , , and : (a) , (b) , (c) , and (d) scaled with Eqs. (37) and (35) to . The colours and simulation parameters are as for Figure 6 .

Image of FIG. 8.
FIG. 8.

Energy and power conversion efficiencies as functions of q and θ for differing , and β, and : (a) , (b) ), (c) , and (d) . Colour coding is for different ϕ: (red), (blue), (green), (orange), and (purple). Linestyles are for different values: (solid line), (dotted line), and (dashed line).

Image of FIG. 9.
FIG. 9.

Scaled energy and power conversion efficiencies Σ and as functions of q and Θ for differing , and β, based on Eqs. (37)–(40) and scaled to , and : (a) , (b) , (c) , and (d) . The colours, linestyles, and simulation parameters are as for Figure 8 .

Tables

Generic image for table
Table I.

Estimates of the temperature, , and energy conversion efficiencies in various regions in the solar system.

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/content/aip/journal/pop/20/3/10.1063/1.4793726
2013-03-01
2014-04-24
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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Linear mode conversion of Langmuir/z-mode waves to radiation: Scalings of conversion efficiencies and propagation angles with temperature and magnetic field orientation
http://aip.metastore.ingenta.com/content/aip/journal/pop/20/3/10.1063/1.4793726
10.1063/1.4793726
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