What question did this study set out to answer?

To evaluate whether gradient drift or Farley-Buneman instabilities explain the slant E condition on polar cap ionograms and assess its use for measuring polar electric fields.

September 1, 1975Journal of Geophysical Research Atmospheres

The Farley instability and the polar capEfield

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To evaluate whether gradient drift or Farley-Buneman instabilities explain the slant E condition on polar cap ionograms and assess its use for measuring polar electric fields.
Calculated polar cap theoretical growth rate distributions for gradient drift and Farley-Buneman two-stream instabilities.
Compared theoretical instability distributions with observational records of the slant E condition obtained from polar cap ionograms.
The Farley instability aligns closely with the observed distribution of the slant E condition, indicating it is the dominant causal mechanism.
Ground-based ionospheric Doppler radar can identify when polar cap electric fields exceed critical thresholds and determine both electric field direction and magnitude.

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Implication

Theoretical analysis reveals the Farley instability drives the slant E condition in the polar cap, indicating radar can measure high-latitude electric fields.

Cite This Study

Primdahl et al. (1975) studied this question.

synapsesocial.com/papers/6a75bdbd3d78a07d47dd7df9 https://doi.org/10.1029/ja080i025p03698

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Implication

Theoretical analysis reveals the Farley instability drives the slant E condition in the polar cap, indicating radar can measure high-latitude electric fields.

The Farley instability and the polar capEfield

Key Points

Discussion

Implication

Cite This Study

The Farley instability and the polar capEfield

Key Points

Discussion

Implication

Cite This Study

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