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Proceedings Paper

Using radio-induced fluorescence to determine the horizontal structure of ion layers in the mesosphere and lower thermosphere
Author(s): Paul A. Bernhardt; Natalia A. Gondarenko; Parvez N. Guzdar; Joseph D. Huba; S. L. Ossakow; Frank T. Djuth; C. A. Tepley; Michael P. Sulzer; Ludmila Kagan; M. C. Kelley
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Paper Abstract

Two-dimensional images of Sporadic-E layers have been produced using a new technique called radio induced fluorescence (RIF). This technique makes the ion layers glow when being stimulated by high power radio waves. Normally the ion-layers do not radiate visible emissions. Experiments on January 1998 at Arecibo Observatory in Puerto Rico have shown that the layers can be made to glow at 557.7 nm and other wavelengths by illuminating them with radio waves at 3.175 MHz with effective radiated powers of 80 megawatts. The regions of the sporadic-E layers that have electron densities greater than the critical density for reflection of the radio waves emit electrons that collide with and excite atmospheric atomic oxygen and molecular nitrogen. A charge-coupled-device (CCD) imager located on the ground is used to capture images of the glowing E-region structures. The camera exposure times were in the range of 15 to 45 seconds. The images obtained using this technique show a wide variety of structures in the sporadic-E layers. Some layers cover the 15 x 30 km region illuminated by the radio wave beam. Other layers show strong modulation of the E-region by neutral wind instabilities. Two-dimensional computer simulations of the coupling between neutral wind turbulence and the ion layers simulate the structure in the images.

Paper Details

Date Published: 30 January 2002
PDF: 11 pages
Proc. SPIE 4485, Optical Spectroscopic Techniques, Remote Sensing, and Instrumentation for Atmospheric and Space Research IV, (30 January 2002); doi: 10.1117/12.454263
Show Author Affiliations
Paul A. Bernhardt, Naval Research Lab. (United States)
Natalia A. Gondarenko, Univ. of Maryland/College Park (United States)
Parvez N. Guzdar, Univ. of Maryland/College Park (United States)
Joseph D. Huba, Naval Research Lab. (United States)
S. L. Ossakow, Naval Research Lab. (United States)
Frank T. Djuth, Geospace Corp., Inc. (United States)
C. A. Tepley, Arecibo Observatory/Cornell Univ. (United States)
Michael P. Sulzer, Arecibo Observatory/Cornell Univ. (United States)
Ludmila Kagan, NRIFI and Cornell Univ. (Russia)
M. C. Kelley, Cornell Univ. (United States)

Published in SPIE Proceedings Vol. 4485:
Optical Spectroscopic Techniques, Remote Sensing, and Instrumentation for Atmospheric and Space Research IV
Allen M. Larar; Martin G. Mlynczak, Editor(s)

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