Absolute electron density measurements in the equatorial ionosphere

Details Absolute electron density measurements in the equatorial ionosphere Absolute electron density measurements in the equatorial ionosphere

Oct 1985

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985jatp...47..781b&link_type=abstract

(IUGG, IAGA, USAF, et al., International Symposium on Equatorial Aeronomy, 7th, Hong Kong, Mar. 22-29, 1984) Journal of Atmosphe

Computer Science

Sound

18

Equatorial Atmosphere, Ionospheric Electron Density, Rocket Sounding, Daytime, Electron Density Profiles, Equatorial Electrojet, Ionospheric Disturbances, Night Sky, Space Plasmas, Spread F, Vertical Distribution

Scientific paper

Accurate measurement of the electron density profile and its variations is crucial to further progress in understanding the physics of the disturbed equatorial ionosphere. To accomplish this, a plasma frequency probe was included in the payload complement of two rockets flown during the Condor rocket campaign conducted from Peru in March 1983. This paper presents density profiles of the disturbed equatorial ionosphere from a night-time flight in which spread-F conditions were present and from a day-time flight during strong electrojet conditions. Results from both flights are in excellent agreement with simultaneous radar data in that the regions of highly disturbed plasma coincide with the radar signatures. The spread-F rocket penetrated a topside depletion during both the upleg and downleg. The electrojet measurements showed a profile peaking at 1.3 x 10 to the 5th per cu cm at 106 km, with large scale fluctuations having amplitudes of roughly 10 percent seen only in the upward gradient in electron density. This is in agreement with plasma instability theory. It is further shown that simultaneous measurements by fixed-bias Langmuir probes, when normalized at a single point to the altitude profile of electron density, are inadequate to correctly parameterize the observed enhancements and depletions.

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