Characterization of Ionospheric Plasma Bubbles With the Global Ultraviolet Imager

Details Characterization of Ionospheric Plasma Bubbles With the Global Ultraviolet Imager Characterization of Ionospheric Plasma Bubbles With the Global Ultraviolet Imager

Dec 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004agufmsa23b..08k&link_type=abstract

American Geophysical Union, Fall Meeting 2004, abstract #SA23B-08

Physics

6982 Tomography And Imaging, 2415 Equatorial Ionosphere, 2439 Ionospheric Irregularities, 2494 Instruments And Techniques, 3260 Inverse Theory

Scientific paper

Density depletions caused by plasma turbulence in the nighttime equatorial ionosphere referred to as ``Equatorial Spread-F'' (ESF) remain distressingly elusive despite several decades of observation, modeling, and theory. Recent FUV measurements of atomic oxygen recombination at 135.6 nm from the Global Ultraviolet Imager (GUVI) onboard the TIMED satellite provide an unprecedented opportunity to detect and investigate occurrence characteristics of ESF on a global scale. In this work, we present a comprehensive analysis of GUVI data using an automated bubble detection technique, in conjunction with tomographic image reconstruction methods capturing height-dependent plasma structures. Subsequent statistical analyses are performed to investigate and characterize the role of geomagnetic, solar, and seasonal influences on the triggering and development of equatorial plasma bubbles. Furthermore, we report on the analyses over several years to provide statistical information about the seasonal and longitudinal variations of ESF occurrence. Such long-term global analyses based on UV measurements contribute to the broader goal of understanding bubble formation patterns and consequently to a more accurate characterization of the mechanisms responsible for the generation and evolution of these plasma irregularities.

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