In-situ measurements of ionospheric plasma density by two different techniques - A comparison

Details In-situ measurements of ionospheric plasma density by two different techniques - A comparison In-situ measurements of ionospheric plasma density by two different techniques - A comparison

Aug 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991jatp...53..787m&link_type=abstract

(Equatorial aeronomy; International Symposium, 8th, San Miguel de Tucuman, Argentina, Mar. 21-27, 1990, Selected Papers. A92-138

Physics

3

F Region, Ion Currents, Plasma Density, Plasma Sheaths, Brazil, Density Measurement, Electrostatic Probes, Night Sky

Scientific paper

A comparison of the electron density height profiles estimated from the oscillator frequency variations of a high-frequency capacitance probe (HFC) and from the near-saturation ion current variations of a Langmuir probe (LP) is presented. Above the F-region peak, the electron density values estimated from the LP ion currents are considerably less than those estimated from the HFC data, while below the F-region peak, the LP electron densities seem to be slightly greater than the HFC electron densities. It is concluded that the higher LP electron densities at lower heights are probably due to an increase in the effective sensor surface area caused by the sheath formation. In the region above the F-peak the relative lower plasma density obtained from LP current is considered to be caused by a change in the floating potential of the rocket, a decrease in the thickness of the plasma sheath, and an increase in the mean ion thermal velocity relative to the rocket velocity.

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