Other
Scientific paper
May 2007
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007agusmsa24a..03m&link_type=abstract
American Geophysical Union, Spring Meeting 2007, abstract #SA24A-03
Other
2415 Equatorial Ionosphere, 2439 Ionospheric Irregularities, 2494 Instruments And Techniques
Scientific paper
By combining data from multiple types of instrumentation collected at different locations, we can come to a better understanding of the physics and properties of structures in the low-latitude ionosphere and their effects on trans-ionospheric radio wave propagation. In this study, we present examples of spread-F events collected from both the Pacific (Hawaii/Christmas Island) and South American (Chile/Peru) sectors using optical imaging systems and coherent backscatter radar in addition to both ground- and space-based GPS receivers. The optical data provide background information on the location and spatial/temporal dynamics of irregularity-containing depletions over a wide spatial region. In order to put the observations made with the other instrumentation at different locations into a broader context, we map the structure observed with the optical instrumentation along magnetic field lines. In the case of coincident imaging/radar data, we show that the images aid in interpretation of the spatial characteristics of the structure observed by the narrow radar beam. We also compare velocities measured by the radar and imaging systems to study the conjugate nature of these irregularities in more detail. In the case of coincident imaging/occultation data, we highlight how the imaging data can be used to determine when the spherical symmetry conditions assumed in the occultation inversion breaks down. We will also discuss future experiments that will employ additional instruments to further study the conjugate nature of these irregularity regions.
Chau Jorge L.
Kelley Michael C.
Ledvina Brent M.
Makela Jarmo
Miller Ethan S.
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