Abstract
We report high-resolution measurements of natural photoelectron-enhanced plasma lines using a chirped (frequency modulated) transmitter pulse with the EISCAT UHF radar. Results from two different experiments are shown here. The first was run in May 1986 near solar minimum and the second was run in July–August 1989 near solar maximum. The enhanced detectability and time resolution of spectral plasma-line measurements are demonstrated. The frequency resolution allows for direct measurements of field-aligned electron currents larger than 10 μAm −2 at electron densities less than 2 10 11m −3. However, due to quiet ionospheric conditions, unambiguous current values of this size could not be measured from the present data.
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