Plasma density irregularities in the high-latitude top side ionosphere

Details Plasma density irregularities in the high-latitude top side ionosphere Plasma density irregularities in the high-latitude top side ionosphere

Feb 1976

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1976jgr....81..515p&link_type=abstract

Journal of Geophysical Research, vol. 81, Feb. 1, 1976, p. 515-523.

Physics

2

Ionospheric Ion Density, Plasma Density, Power Spectra, Spectrum Analysis, Thermal Plasmas, Upper Atmosphere, Atmospheric Ionization, Electrostatic Probes, Energy Dissipation, Frequency Distribution, Isis Satellites, Plasma Flux Measurement, Spectral Energy Distribution

Scientific paper

The power spectra of small-scale ionization irregularities over the scale size range 200-150 km are studied using thermal plasma density measurements obtained by a spherical electrostatic analyzer probe aboard ISIS 1. Most (90%) of the spectra show that the irregularities obey a power law with a spectral index of about 2, consistent with the dissipation of large-scale size irregularities to form continuously smaller scale sizes by instability and turbulence mechanisms. This power law holds for scale sizes ranging from the lower limit of measurement to an outer scale size of about 100 km. More complex structure observed in about 10% of the spectra indicates that more than one mechanism sometimes operates to dissipate the energy of thermal ion and electron irregularities. Over the scale size range 1-10 km the variation with latitude of the integrated spectral power shows an increased amplitude level throughout the high-latitude irregularity zone. The maximum irregularity amplitude is consistently located in the vicinity of soft particle flux. No systematic variation of spectral index or irregularity amplitude with height is found over the range 574-3523 km.

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