Other
Scientific paper
Oct 1990
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990georl..17.1849l&link_type=abstract
Geophysical Research Letters (ISSN 0094-8276), vol. 17, Oct. 1990, p. 1849-1852. Research supported by NSERC.
Other
2
Earth Ionosphere, Magnetohydrodynamic Flow, Plasma Compression, Plasma Layers, Plasma Temperature, Space Plasmas, Electric Current, Polytropic Processes
Scientific paper
A curious finding of Huang et al. (1989) suggests a polytropic index of plasma compression of about 0.7 in the quiet-time central plasma sheet. Here it is shown that the reduction of this index from its adiabatic value (5/3) can be achieved through an ionospherc outflow of plasma which lowers the plasma temperature by virtue of energy partition. The observed correlation between the plasma temperature and density is best reproduced by an ionospheric source of about 5 x 10 to the 25th ions/sec, consistent with independent experimental estimates and smaller than the average solar-wind source by a factor of two or more. Despite the change in the polytropic relationship, the global energy equation P(V exp 5/3) = constant (V = volume of a unit flux tube) still holds approximately (in the absence of other energy-loss mechanisms).
Liu Wende
Rostoker Gordon
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