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Title: The generation of non aspect sensitive plasma density irregularities by field aligned drifts in the lower ionosphere
Authors: Robinson, T. R.
Schlegel, K.
First Published: 1-Jul-2000
Publisher: European Geosciences Union (EGU), Copernicus Publications, Springer Verlag (Germany)
Abstract: A theory of the generation of plasma density irregularities with virtually no aspect sensitivity, in the lower ionosphere at high latitudes, by electron drifts aligned with the geomagnetic field, is presented. The theory is developed through fluid equations in which the destabilising mechanism involves positive feedback from electron collisional heating. When field aligned electron drift speeds exceed a few km s-1, this effect destabilises waves with wavelengths in excess of a few tens of metres in the lower E-region, where collisional effects are sufficiently large. Furthermore, the threshold conditions are almost independent of the wave propagation direction and the unstable waves propagate at speeds well below the ion acoustic speed. The role that this new instability may play in recent radar backscatter observations of short scale irregularities propagating in directions close to that of the geomagnetic field, in the lower E-region is also considered.
DOI Link: 10.1007/s00585-000-0799-y
ISSN: 0992-7689
eISSN: 1432-0576
Type: Journal Article
Rights: Archived with reference to SHERPA/RoMEO and publisher website. © European Geosciences Union 2000. Version of record:
Appears in Collections:Published Articles, Dept. of Physics and Astronomy

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