Excitation of Low Frequency Turbulence Along Auroral Field Lines

Details Excitation of Low Frequency Turbulence Along Auroral Field Lines Excitation of Low Frequency Turbulence Along Auroral Field Lines

Jan 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992phdt........28j&link_type=abstract

Thesis (PH.D.)--MASSACHUSETTS INSTITUTE OF TECHNOLOGY, 1992.Source: Dissertation Abstracts International, Volume: 53-06, Secti

Computer Science

Magnetosphere

Scientific paper

The resonant interaction of low frequency turbulence with oxygen ions has provided a satisfactory explanation for the formation of ion conics at auroral altitudes. These waves, found along closed field lines which emanate from the central plasma sheet, energize ionospheric oxygen to magnetospheric energies and thus provide a major release mechanism for ionospheric oxygen. Although the source of the turbulence is not particularly clear, it is apparently not co-located with ion heating. We have suggested that the turbulence may originate in the equatorial region. Waves generated at frequencies both above and below the equatorial hydrogen cyclotron frequency propagate along field lines to auroral altitudes where they provide substantial ion heating. At low altitudes, where the waves resonant with oxygen, parallel gradients in the magnetic field couple the two propagating cold plasma modes so that right-hand polarized waves exchange energy with the left-hand polarized mode (and vice versa). We determine the transmission coefficients associated with this coupling process analytically by implementing a phase-integral analysis. Moreover, we substantiate these calculations using a numerical technique which involves analytic continuation of the solutions into the complex plane. We determine that wave power generated in the equatorial region of the central plasma sheet contributes substantially to ion heating at auroral altitudes. (Copies available exclusively from MIT Libraries, Rm. 14-0551, Cambridge, MA 02139-4307. Ph. 617-253-5668; Fax 617-253-1690.).

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