The first coordinated ground- and space-based optical observations of equatorial plasma bubbles

Details The first coordinated ground- and space-based optical observations of equatorial plasma bubbles The first coordinated ground- and space-based optical observations of equatorial plasma bubbles

Jul 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003georl..30nssc6k&link_type=abstract

Geophysical Research Letters, Volume 30, Issue 14, pp. SSC 6-1, CiteID 1766, DOI 10.1029/2003GL017301

Physics

25

Ionosphere: Equatorial Ionosphere, Ionosphere: Ionospheric Irregularities, Ionosphere: Midlatitude Ionosphere, Ionosphere: Instruments And Techniques

Scientific paper

We report on ionospheric optical emissions detected by the GUVI instrument on the TIMED satellite. As the satellite crosses the equatorial zone the bright Appleton Anomaly region is imaged. Often these bright zones are interrupted by regions slanted from west to east as the equator is approached forming a backwards `C'-shape in the image. To explain this feature we use simultaneous ground-based observations looking equatorward from Hawaii using the 777.4-nm emission. We also compare these optical observations to inverted electron density maps, as well as to those made by radar and to numerical simulations of the Rayleigh-Taylor instability. The characteristic shape is a result of a shear in the eastward plasma flow velocity, which peaks near the F peak at the equator and decreases both above and below that height. The ability to detect these unstable and usually turbulent ionospheric regions from orbit provides a powerful global remote sensing capability for an important space weather process.

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