Physics
Scientific paper
Sep 1984
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984p%26ss...32.1069p&link_type=abstract
Planetary and Space Science (ISSN 0032-0633), vol. 32, Sept. 1984, p. 1069-1078.
Physics
58
Auroral Zones, Density Measurement, Magnetospheric Ion Density, Plasma Diagnostics, Plasma Oscillations, Radar Measurement, Electron Density (Concentration), Equatorial Regions, Hydrogen Ions, Ion Density (Concentration), Plasma Density
Scientific paper
Auroral radar studies of ULF pulsations have proved useful in determining the spatial characteristics of resonant oscillations. A particular class of ringing or transient pulsations has been identified in the radar data as toroidal mode eigenoscillations. A total of 64 events of this type recorded by either the STARE radar in Scandinavia, or the Slope Point radar in New Zealand are considered, giving a combined latitudinal coverage of approximately 12 deg. These events are interpreted as toroidal mode eigenoscillations; the periods for individual events and the mean periods increase with geomagnetic latitude. Use of hydromagnetic resonance theory allows the equatorial ion mass density to be determined. The densities obtained are appropriate to the plasmatrough, and range from about 10 to 100 a.m.u./cu cm near geosynchronous orbit. The radial variation in the equatorial plane is typically R to the -5th in the midnight-noon sector and R to the -3rd in the noon-midnight sector. To reconcile these pulsation periods with in situ electrondensity measurements implies that H(+) ion densities in the range of about 1-10lcu cm and about 50 percent O(+) ions are required.
Allan W.
Keys J. G.
Nielsen Edward
Poulter E. M.
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