Ogo 6 observations of small-scale irregularity structures associated with subtrough density gradients

Details Ogo 6 observations of small-scale irregularity structures associated with subtrough density gradients Ogo 6 observations of small-scale irregularity structures associated with subtrough density gradients

Jan 1978

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1978jgr....83..182b&link_type=abstract

Journal of Geophysical Research, vol. 83, Jan. 1, 1978, p. 182-190.

Statistics

Computation

2

F Region, Ionospheric Ion Density, Midlatitude Atmosphere, Oxygen Ions, Ogo-6, Plasmapause, Waveguides

Scientific paper

High-resolution Ogo 6 retarding potential analyzer data have been utilized to demonstrate the association of small-scale ionospheric irregularities with sharp F region cross-L density gradients in the L range of approximately 2-4. These subtrough irregularity structures which often appeared in near-conjugate locations were observed during periods of quieting following magnetospheric storms and were found to be associated with sharp gradients of O(+) ions or of the light ions depending on the height of the satellite. Similar structures in O(+) ions were observed at perigee (400 km) altitudes during periods of extended quiet geomagnetic conditions. During such quiet periods the small-scale density irregularities associated with O(+) gradients were found to be correlated with low-frequency electrostatic fluctuations but not with any appreciable temperature variations. Since gradient scale lengths as small as 1 km were often observed, the drift wave plasma instability is suggested as a possible mechanism for the formation of the small-scale irregularities. A study of 137-MHz scintillations at a point L = 2.8 together with model computations based on Ogo 6 irregularity parameters strongly indicates that at least a part of the quiet time mid-latitude scintillations is caused by the plasma instabilities associated with the subtrough density gradients.

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