Hydromagnetic waves : temporal development of coupled modes

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086 0 ‡aD 301.45/39:559
088 ‡aADA 030331
088 ‡aAFGL TR 76-104
100 1 ‡aRadoski, Henry R., ‡d1936- ‡0http://id.loc.gov/authorities/names/n90679308 ‡1http://id.loc.gov/rwo/agents/n90679308
245 1 0 ‡aHydromagnetic waves : ‡btemporal development of coupled modes / ‡cHenry R. Radoski.
264 1 ‡aHanscom AFB, Massachusetts : ‡bAir Force Geophysics Laboratories, Air Force Systems Command, United States Air Force, ‡c1976.
300 ‡a34 pages : ‡billustrations ; ‡c28 cm.
336 ‡atext ‡btxt ‡2rdacontent
337 ‡aunmediated ‡bn ‡2rdamedia
338 ‡avolume ‡bnc ‡2rdacarrier
490 0 ‡aAFGL-TR ; ‡v76-104
490 0 ‡aEnvironmental Research Papers ; ‡vNo. 559
500 ‡aResearch supported by the Air Force Geophysics Laboratory, Air Force Systems Command, United States Air Force, Hanscom AFB, Massachusetts.
500 ‡aSpace Physics Division Project 7601.
500 ‡aADA030331 (from http://www.dtic.mil).
500 ‡a"6 May 1976."
504 ‡aIncludes bibliographical references (pages 29-30).
520 ‡aNumerical solutions to the initial value problem have been obtained for the guided (toroidal) and isotropic (poloidal) electric fields of hydromagnetic waves for the asymmetric case. The cylindrical model of the inner magnetosphere has been used in which the field lines are arcs of circles and the surface of the earth is planar. The cases considered have the initial disturbance completely restricted to either the guided or isotropic field components to emphasize the effect of coupling. The development of the system has been calculated for asymmetric modes of order m = 1 to 10, corresponding to from one to ten full waves in longitude and the lowest order (n =1) field-line mode, corresponding to a half-wave along a field line. The initial isotropic (east-west) electric-field component is in an eigenstate of the symmetric or uncoupled poloidal mode. In this case, when the coupling is reduced to zero, the isotropic electric field simply oscillates harmonically. The initial guided (north-south) electric-field component is defined to increase radially and towards higher latitudes. As a check on the numerical solutions, the total energy of the system is continually calculated and compared with the initial energy. Although no damping is included in the problem, the poloidal-mode energy decays with time, as has been shown theoretically. The toroidal mode reaches maximum amplitude in regions of relatively narrow latitudinal extent. The large spatial variation of the magnetic field in these resonance regions must be associated with large field aligned currents. (Author).
538 ‡aMode of access: Internet.
650 7 ‡aRadio ‡xInterference. ‡2fast ‡0http://id.worldcat.org/fast/1087095
650 7 ‡aNumerical analysis. ‡2fast ‡0http://id.worldcat.org/fast/1041273
650 7 ‡aMagnetohydrodynamics. ‡2fast ‡0http://id.worldcat.org/fast/1005872
650 7 ‡aMagnetic storms. ‡2fast ‡0http://id.worldcat.org/fast/1005798
650 7 ‡aGeomagnetism. ‡2fast ‡0http://id.worldcat.org/fast/940796
650 7 ‡aGeomagnetic micropulsations. ‡2fast ‡0http://id.worldcat.org/fast/940790
650 7 ‡aElectric fields. ‡2fast ‡0http://id.worldcat.org/fast/904783
650 0 ‡aNumerical analysis. ‡0http://id.loc.gov/authorities/subjects/sh85093237
650 0 ‡aMagnetic storms. ‡0http://id.loc.gov/authorities/subjects/sh85079747
650 0 ‡aElectric fields. ‡0http://id.loc.gov/authorities/subjects/sh85041688
650 0 ‡aRadio ‡xInterference. ‡0http://id.loc.gov/authorities/subjects/sh85110402
650 0 ‡aGeomagnetism. ‡0http://id.loc.gov/authorities/subjects/sh85079763
650 0 ‡aGeomagnetic micropulsations. ‡0http://id.loc.gov/authorities/subjects/sh85054119
650 0 ‡aMagnetohydrodynamics. ‡0http://id.loc.gov/authorities/subjects/sh85079784
710 2 ‡aU.S. Air Force Geophysics Laboratory. ‡0http://id.loc.gov/authorities/names/n79109638 ‡1http://id.loc.gov/rwo/agents/n79109638
730 0 ‡aTechnical Report Archive & Image Library (TRAIL)
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