A purely growing electromagnetic mode operative in the geomagnetic tail

Details A purely growing electromagnetic mode operative in the geomagnetic tail A purely growing electromagnetic mode operative in the geomagnetic tail

Jan 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992jgr....97..141w&link_type=abstract

Journal of Geophysical Research (ISSN 0148-0227), vol. 97, Jan. 1, 1992, p. 141-151.

Other

13

Electromagnetic Radiation, Geomagnetic Tail, Magnetohydrodynamic Waves, Space Plasmas, Wave Dispersion, Magnetic Fields, Neutral Sheets, Plasma Temperature, Polarization (Waves), Vlasov Equations, Wave Propagation

Scientific paper

This paper discusses a purely growing mode driven by a cross-field current. The present discussion pays special attention to two aspects. One is to generalize the analysis by Chang et al. (1990) so that the unmagnetized-ion approximation used by these authors is removed, and the other is to apply the theory to several regions in the magnetotail where the value of the plasma beta is in general very high. The present analysis is restricted to waves propagating along the ambient magnetic field. The high ion beta limit is discussed by considering two different situations. The first is to fix the strength of the ambient magnetic field but to increase the plasma temperature, and the second is to maintain the plasma temperature but to decrease the ambient magnetic field strength. It is found that, in the former case, the mode stabilizes when beta(i) approaches infinity, but in the latter case the instability persists even if beta(i) approaches infinity (although the growth rate is significantly reduced). The present theory is applied to three regions in the magnetotail: (1) the inner edge region, (2) the midtail region, and (3) the neutral sheet of a distant magnetotail. It is found that, among these three regions, for a given value of v0/alpha(i), where v0 is the net cross-field drift speed between the electrons and the ions and alpha(i) is the ion thermal speed, the growth rate in the neutral sheet is the largest.

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