Plasmatrough ion mass densities determined from ULF pulsation eigenperiods

Details Plasmatrough ion mass densities determined from ULF pulsation eigenperiods Plasmatrough ion mass densities determined from ULF pulsation eigenperiods

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.

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