The evolution of pearls in the earth's magnetosphere

Details The evolution of pearls in the earth's magnetosphere The evolution of pearls in the earth's magnetosphere

Aug 1983

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983p%26ss...31..859m&link_type=abstract

Planetary and Space Science (ISSN 0032-0633), vol. 31, Aug. 1983, p. 859-863.

Computer Science

Numerical Analysis

12

Earth Magnetosphere, Geomagnetic Micropulsations, Magnetohydrodynamic Waves, Wave Amplification, Wave Propagation, Magnetic Field Configurations, Numerical Analysis, Plasmapause, Wave Diffraction

Scientific paper

As currently understood, Pc1 micropulsation 'pearls' are Alfven wave trains that bounce between magnetic conjugate points along geomagnetic field lines, amplified by the cyclotron instability of hot anisotropic ring current protons during each passage through the near-equatorial region. Pearl propagation and amplification are presently analyzed, taking wave train diffusion in the k-space into account. The competition between instability-induced amplification and diffusion is found to determine the magnetospheric parameter values at which pearls may appear. Diffusion is noted to be especially large under conditions of a thin plasmapause, where pearl generation becomes virtually impossible.

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