Electric field measurements above and within a sporadic‐E layer
Citations Over TimeTop 10% of 1998 papers
Abstract
In‐situ DC and wave electric fields were detected above and within a sporadic‐E layer by sounding rocket‐borne instruments in the presence of quasi‐periodic backscatter radar echoes. When analyzed in conjunction with plasma density measurements, the in‐situ data reveal complex electrodynamics associated with the sporadic‐E layer. The electric field data show: (1) a sinusoidal variation of ±3 mV/m between 130–170 km which may be associated with a gravity wave with a horizontal wavelength of ∼20 km; (2) localized DC electric fields of ∼20 mV/m associated with narrow (few km) plasma density depletions near 125 km altitude; and (3) a broad spectrum of plasma irregularities, including long wavelength (km‐scale) and meter‐scale waves. No short‐scale plasma waves were observed in‐situ above 115 km, despite the fact that simultaneous radar data show echoes originating from altitudes as high as 135 km.
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