Charts for computing the refractive indexes of a magneto-ionic medium

Deschamps, G.; Weeks, W. Porter

doi:10.1109/tap.1962.1137862

Cited by 7 publications

(3 citation statements)

References 5 publications

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“…Thus w and k must be related and we can express their relation by saying that the k = (w, k) lie on a surface @) in four dimensional space. Alternatively w is a multivalued function of k: w;(k) with i taking 10 distinct values or, given w, the vector k must lie on a surface 6w section of @) at constant w. The surfaces @) or 6w will be called dispersion surfaces; 6w, except for a scale factor, is the index surface for the frequency w. These surfaces, or related ones, have been described in a number of publications, (Clemmow and Mullaly, 1954;Deschamps and Weeks, 1962;Allis, Buchsbaum, and Bers, 1963;Felsen, 1965;Deschamps, 1965). The use of the index surface in ray tracing has been thoroughly discussed by Felsen (1965).…”

Section: Modal Plane Wavesmentioning

confidence: 99%

Radiation of an Antenna in a Compressible Magnetoplasma

Deschamps

Kesler

1967

Radio Science

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Section: Modal Plane Wavesmentioning

confidence: 99%

Radiation of an Antenna in a Compressible Magnetoplasma

Deschamps

Kesler

1967

Radio Science

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“…It is easy to verify that (8) implies that L2 = K2 = n2 = 1; the line Doo is now a fixed line joining the point n = 0 to the point n = 1. This particular relation was used by Deschamps and Weeks [1962], and the construction of Do and DI in terms of the magneto-ionic parame ters X and Y was discussed in detail. This display is limited to a region in the vicinity of the plas ma resonance and the gyroresonance of the When the frequency w is much larger than lli and Oi the Appleton·Hartree equation is justified.…”

Section: Appleton-rartree Dispersion Relationmentioning

confidence: 99%

Angular dependence of the refractive index in the ionosphere

Deschamps¹

1965

J. RES. NATL. BUR. STAN. SECT. D. RAD. SCI.

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Th e di s pe rs iQn prope rti es of a n a nisotropi c me dium, s uc h as the ionos phere in prese nce of the earth 's magne ti c fi e ld , are c onve nie ntly re prese nte d by the variations of the refractiv e index with th e direc tio n of propagati on. It is s hown tha t, fo r a numbe r of cases of prac ti cal inte rest, th e vari ati on of the ind ex n with th e angle 0 tak es a s pec ial form whi c h can b e e xpressed by a graphi cal co ns tru c ti o n; th e res ult n is re ad on a circ ula r scale, c aU ed the ind ex c ircle, a t the points where it is inte rsec ted by a s tra ight line whi c h de pe nd s in a simpl e mann e r o n the direc tio n of propagati o n o. The sa me co ns tru cti on a ppli es whe n the wave is e vanesce nt a nd th e n it giv es the imagin ar y valu e of th e refra c tive ind ex or extin ction ind ex.Th e range of appli cati on of t hi s co ns truc tio n includ es th e Apple ton-H a rtree equ ati on, its ge neralization for a ny numbe r of io ns , th e hydro magne tic wa ves in a me dium with finite co mpress ibiljty, a nd th e va ri ous a pp rox.im ati ons corres po ndin g to limiting or transiti onal cases -As trom wa ves, uni axial medi a, a nd Booker's h ydrom agn eti c approxim a tion . It could also be a ppli ed to magneti zed ferrites.For mos t a ppli ca ti ons th e inde x c ircle re prese ntati on ca n take th e pl ace of th e di s pe rsio n s urface. Th e milln features of thi s s urface-the numbe r of s hee ts, wh e th e r th e y are real o r im agin ar y, and th e directi on of th e asy mptotes -a re all di s pla yed on th e ind ex c ircl e. If th e need ari ses, it is easy to trace th e di s p e rs ion s urface a nd 1.0 foUow its de form a ti o ns as th e para mete rs of the me dium a re vari e d .

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“…Arbel and Felsen [1962b] have shown how these closed form solu t ions can be used to study the previously mentioned field singularities when W e is finite. Mittra and Deschamps [1962] have expressed the dyadic Green's function for finite W e in terms of a modification of the closed form results for Wc = 00 plus a correction term; since the closed form expression is dominan t in the near field of the 482 source, this formulation appears attractive for antenna impedance calculations. A variational approach to the antenna impedance problem has been presented by Ament,Katzin,and Katzin [196 2].…”

Section: B Stationary Sources In Anisotropic Plasmasmentioning

confidence: 99%