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Title:Simultaneous observations of meteors and the equatorial electrojet at Jicamarca
Author(s):Chapin, Elaine
Doctoral Committee Chair(s):Kudeki, Erhan
Department / Program:Electrical and Computer Engineering
Discipline:Electrical Engineering
Degree Granting Institution:University of Illinois at Urbana-Champaign
Degree:Ph.D.
Genre:Dissertation
Subject(s):Geophysics
Engineering, Electronics and Electrical
Abstract:Observations of meteor echoes at Jicamarca in August of 1990, 1991, and 1992 reveal some unusual properties. The echo durations are very long ($\sim$2 s to 3 minutes), radio wave scattering is non-specular (echoes are detected simultaneously over an $\sim$10 to 15 km altitude range centered about 97 km), and the Doppler spectra of the scattered signals contain components shifted by as much as $\sim$400 ms$\sp{{-}1}$ immediately after the onset of the echoes. These unusual properties are attributed to the growth and propagation of plasma irregularities along meteor trails deposited within the equatorial electrojet. It is suggested that trails at electrojet heights must carry intense transient currents that excite two-stream and/or gradient drift instabilities for irregularity growth. The direction of electron motion responsible for the transient current agrees with the Doppler shift of the high-frequency components in meteor echo signals. Nighttime Jicamarca electrojet data with simultaneous meteor observations are studied in detail and compared with the plasma irregularity explanation.
Issue Date:1996
Type:Text
Language:English
URI:http://hdl.handle.net/2142/20558
Rights Information:Copyright 1996 Chapin, Elaine
Date Available in IDEALS:2011-05-07
Identifier in Online Catalog:AAI9625120
OCLC Identifier:(UMI)AAI9625120


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