Incoherent scatter studies of sporadic-E using 300 m resolution

Details Incoherent scatter studies of sporadic-E using 300 m resolution Incoherent scatter studies of sporadic-E using 300 m resolution

May 1988

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988jatp...50..277t&link_type=abstract

(EISCAT Scientific Association, International EISCAT Workshop, 3rd, Bad Lauterberg, Federal Republic of Germany, Mar. 23-27, 198

Physics

13

Eiscat Radar System (Europe), Incoherent Scatter Radar, Radar Resolution, Sporadic E Layer, Heavy Ions, Plasma Drift, Spatial Resolution, Ultrahigh Frequencies

Scientific paper

A new EISCAT UHF experiment with 300-m range resolution is introduced. It is based on Barker-coded five-pulse patterns and single pulses on eight channels. The high resolution is obtained by using a bit length of 2 microsec. A thin and intense sporadic-E-layer drifting vertically within the altitude region 102-105 km has been observed with this experiment. The drift speed of the layer is approximately equal to the measured vertical plasma velocity. Occasionally the layer remains stationary and is compressed by vertical convergent plasma flow. The decay of the layer is at least partly caused by wave motions in the neutral atmosphere. It is shown that the layer contains heavy ions, most probably Fe(+). The composition fit for molecular and Fe(+) ions gives molecular ion concentrations which are much higher than those estimated on the basis of the electron density. Therefore, it is concluded that the layer must also contain light metal ions, perhaps Mg(+). According to composition fits of Fe(+) and Mg(+), the abundance of Fe(+) in the layer is 60-75 percent.

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