Origin of Low-Frequency Oscillations in the Ionosphere

Valeriy V. Gavrishchaka; Supriya B. Ganguli; Gurudas I. Ganguli

doi:10.1103/PhysRevLett.80.728

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Origin of Low-Frequency Oscillations in the Ionosphere

Valeriy V. Gavrishchaka and Supriya B. Ganguli

Gurudas I. Ganguli

Science Applications International Corporation, McLean, Virginia 22102

Plasma Physics Division, Naval Research Laboratory, Washington, D.C. 20375

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Phys. Rev. Lett. 80, 728 – Published 26 January, 1998

DOI: https://doi.org/10.1103/PhysRevLett.80.728

Abstract

The threshold current for the ion-acoustic branch is shown to be significantly lower than the ion-cyclotron branch and insensitive to the ion/electron temperature ratio if there is a transverse gradient in the relative magnetic field aligned drift, $V_{d}$ , and $| (k_{y} {/ k}_{z}) (1 / Ω_{i}) ({dV}_{d} / d x) |$ is sufficiently large. The effect persists even when $| {dV}_{d} / d x | \to 0$ provided $(k_{z} {/ k}_{y}) \to 0$ , where $k_{z}$ and $k_{y}$ are wave vectors along and across the magnetic field and $Ω_{i}$ is the ion gyrofrequency. Therefore, the ion-acoustic branch is more central to the plasma processes in the ionosphere than is currently believed.

References (23)

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G. Ganguli, P. J. Palmadesso, and Y. C. Lee, Geophys. Res. Lett. 12, 643 (1985); G. Ganguli and P. J. Palmadesso, 15, 103 (1988); V. Gavrishchaka, M. E. Koepke, and G. Ganguli, Phys. Plasmas 3, 3091 (1996); V. V. Gavrishchaka, M. E. Koepke, and G. I. Ganguli, J. Geophys. Res. 102, 11 653 (1997).
N. D'Angelo, Phys. Fluids 8, 1748 (1965).
G. Ganguli, Y. C. Lee, and P. J. Palmadesso, Phys. Fluids 31, 823 (1988); G. Ganguli, M. J. Keskinen, H. Romero, R. Heelis, T. Moore, and C. Pollock, J. Geophys. Res. 99, 8873 (1994).
C. G. Smith and S. von Goeler, Phys. Fluids 11, 2665 (1968); S. P. Gary and S. J. Schwartz, J. Geophys. Res. 85, 2978 (1980); J. D. Huba, 86, 8991 (1981).
R. J. Goldston and P. H. Rutherford, Introduction to Plasma Physics (IOP, Bristol, 1995).
A. Y. Wong, R. W. Motley, and N. D'Angelo, Phys. Rev. 133, A436 (1964).
D. R. McCarthy, A. E. Booth, J. F. Drake, and P. N. Guzdar, Phys. Plasmas 4, 300 (1997), and references therein.
M. Silberstein and N. F. Otani, J. Geophys. Res. 99, 6351 (1994).
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S. B. Ganguli and P. J. Palmadesso, J. Geophys. Res. 92, 8673 (1987); S. B. Ganguli, P. J. Palmadesso, and H. G. Mitchell, Geophys. Res. Lett. 15, 1291 (1988).
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[c1] J. M. Kindel and C. F. Kennel, J. Geophys. Res. 76, 3055 (1971).

[c2] W. E. Drummond and M. N. Rosenbluth, Phys. Fluids 5, 1507 (1962).

[c3] E. A. Bering, M. C. Kelley, and F. S. Mozer, J. Geophys. Res. 80, 4612 (1975).

[c4] P. M. Kintner et al., Geophys. Res. Lett. 16, 739 (1989).

[c5] P. M. Kintner, Phys. Fluids B 4, 2264 (1992).

[c6] P. M. Kintner et al., Geophys. Res. Lett. 23, 1873 (1996).

[c7] J.-E. Wahlund et al., Geophys. Res. Lett. 21, 1831 (1994).

[c8] J.-E. Wahlund et al., Geophys. Res. Lett. 21, 1835 (1994).

[c9] J.-E. Wahlund et al. (to be published).

[c10] B. D. Fried and R. W. Gould, Phys. Fluids 4, 139 (1961).

[c11] G. Ganguli, P. J. Palmadesso, and Y. C. Lee, Geophys. Res. Lett. 12, 643 (1985); G. Ganguli and P. J. Palmadesso, 15, 103 (1988); V. Gavrishchaka, M. E. Koepke, and G. Ganguli, Phys. Plasmas 3, 3091 (1996); V. V. Gavrishchaka, M. E. Koepke, and G. I. Ganguli, J. Geophys. Res. 102, 11 653 (1997).

[c12] N. D'Angelo, Phys. Fluids 8, 1748 (1965).

[c13] G. Ganguli, Y. C. Lee, and P. J. Palmadesso, Phys. Fluids 31, 823 (1988); G. Ganguli, M. J. Keskinen, H. Romero, R. Heelis, T. Moore, and C. Pollock, J. Geophys. Res. 99, 8873 (1994).

[c14] C. G. Smith and S. von Goeler, Phys. Fluids 11, 2665 (1968); S. P. Gary and S. J. Schwartz, J. Geophys. Res. 85, 2978 (1980); J. D. Huba, 86, 8991 (1981).

[c15] R. J. Goldston and P. H. Rutherford, Introduction to Plasma Physics (IOP, Bristol, 1995).

[c16] A. Y. Wong, R. W. Motley, and N. D'Angelo, Phys. Rev. 133, A436 (1964).

[c17] D. R. McCarthy, A. E. Booth, J. F. Drake, and P. N. Guzdar, Phys. Plasmas 4, 300 (1997), and references therein.

[c18] M. Silberstein and N. F. Otani, J. Geophys. Res. 99, 6351 (1994).

[c19] N. D'Angelo, J. Geophys. Res. 78, 1206 (1973); et al., 79, 3129 (1974); P. M. Kintner, 81, 5114 (1976); R. A. Heelis et al., 89, 3893 (1984); M. Loranc et al., 96, 3627 (1991); T. Potemra et al., 83, 3877 (1978).

[c20] E. Witt and W. Lotko, Phys. Fluids 26, 2176 (1983); V. A. Marchenko and M. K. Hudson, J. Geophys. Res. 100, 19 791 (1995).

[c21] S. B. Ganguli and P. J. Palmadesso, J. Geophys. Res. 92, 8673 (1987); S. B. Ganguli, P. J. Palmadesso, and H. G. Mitchell, Geophys. Res. Lett. 15, 1291 (1988).

[c22] T. E. Moore et al., Geophys. Res. Lett. 13, 901 (1986).

[c23] K. A. Lynch et al., Geophys. Res. Lett. 23, 3293 (1996); J. Bonnell et al., 23, 3297 (1996).

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Origin of Low-Frequency Oscillations in the Ionosphere

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