Combined in-situ and top-side remote observations of evolution of plasma bubbles

Physics

Scientific paper

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[2435] Ionosphere / Ionospheric Disturbances, [2481] Ionosphere / Topside Ionosphere, [2494] Ionosphere / Instruments And Techniques

Scientific paper

Ionospheric plasma bubbles in the nighttime are known to cause interference with GPS navigation and trans-ionospheric RF propagation in general. The characteristics of these bubbles have been studied extensively through observations via TIMED GUVI instrument, ground-based imagers, and the C/NOFS mission, but the production and especially the evolution of the bubbles is not adequately understood. We present here a small satellite mission concept that attempts to do combined in-situ and top-side remote observations of the bubbles to better understand their evolution. The mission aims to specifically address key questions about ionospheric bubbles: What are the characteristics of bubbles and how do these characteristics evolve? Does bubble evolution vary with longitude and/or latitude? How do the bubble occurrence rates at the F-region peak and higher altitudes differ? The proposed mission will carry a 135.6 nm photometer to measure the recombination emission from oxygen ions and a Langmuir probe to measure in-situ plasma density. Topside remote sensing using the photometer allows for observations of bubbles near and below the F-region peak while the Langmuir probe gives in situ measurements necessary to characterize the plasma fluctuations and thereby infer the RF scintillation characteristics. Comparison of such coincident measurements will provide a unique insight into bubble formation and evolution.

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