The impact of gravity waves rising from convection in the lower atmosphere on the generation and nonlinear evolution of equatorial bubble
TLDR
In this article, a nonlinear evolution of equatorial F-region plasma bubbles under varying ambient ionospheric conditions and gravity wave seeding perturbations in the bottom-side F-layer is studied.Abstract:
. The nonlinear evolution of equatorial F-region plasma bubbles under varying ambient ionospheric conditions and gravity wave seeding perturbations in the bottomside F-layer is studied. To do so, the gravity wave propagation from the convective source region in the lower atmosphere to the thermosphere is simulated using a model of gravity wave propagation in a compressible atmosphere. The wind perturbation associated with this gravity wave is taken as a seeding perturbation in the bottomside F-region to excite collisional-interchange instability. A nonlinear model of collisional-interchange instability (CII) is implemented to study the influences of gravity wave seeding on plasma bubble formation and development. Based on observations during the SpreadFEx campaign, two events are selected for detailed studies. Results of these simulations suggest that gravity waves can play a key role in plasma bubble seeding, but that they are also neither necessary nor certain to do so. Large gravity wave perturbations can result in deep plasma bubbles when ionospheric conditions are not conducive by themselves; conversely weaker gravity wave perturbations can trigger significant bubble events when ionospheric conditions are more favorable. But weak gravity wave perturbations in less favorable environments cannot, by themselves, lead to strong plasma bubble responses.read more
Citations
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On the occurrence of postmidnight equatorial F region irregularities during the June solstice
TL;DR: In this article, the GPS total electron content (TEC) fluctuations obtained from a global GPS network and spread F in ionograms from Jicamarca (283°E, 12°S, Dip 1°N) in the American longitude sector and Kwajalein (167°E and 9°N, Dip 4°N).
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Equatorial evening prereversal vertical drift and spread F suppression by disturbance penetration electric fields
TL;DR: In this article, it was shown that the evening prereversal enhancement in the vertical drift/zonal electric field (PRE) and the consequent spread F (ESF) generation can be totally suppressed by penetration electric field of westward polarity arising from over-shielding processes.
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Traveling ionospheric disturbances over the United States induced by gravity waves from the 2011 Tohoku tsunami and comparison with gravity wave dissipative theory
TL;DR: In this article, the authors used GPS total electron content (TEC) data from the United States (U.S.) to look for these AGWs in the ionosphere via their signatures as traveling ionospheric disturbances (TIDs).
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Overview and summary of the Spread F Experiment (SpreadFEx)
David C. Fritts,M. A. Abdu,B. R. Batista,Inez S. Batista,Paulo Batista,Ricardo Buriti,Barclay Clemesha,Thomas Dautermann,E. R. de Paula,B. J. Fechine,Bela G. Fejer,Delano Gobbi,Jennifer S. Haase,Farzad Kamalabadi,E. A. Kherani,Brian Laughman,P. P. Lima,Hanli Liu,Amauri Fragoso de Medeiros,Pierre-Dominique Pautet,Dennis M. Riggin,Fabiano S. Rodrigues,F. T. São Sabbas,J. H. A. Sobral,P. Stamus,H. Takahashi,Michael J. Taylor,Sharon L. Vadas,Fabio Vargas,Cristiano Max Wrasse +29 more
TL;DR: The Spread F Experiment (or SpreadFEx) as mentioned in this paper performed from September to November 2005, with primary measurements in Brazil, was used to define the potential role of neutral atmosphere dynamics, specifically gravity wave motions propagating upward from the lower atmosphere, in seeding Rayleigh-Taylor instability and plasma bubbles extending to higher altitudes.
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Measurement of the Characteristics of TIDs Using Small and Regional Networks of GPS Receivers during the Campaign of 17–30 July of 2008
TL;DR: In this article, the authors present the results of a dedicated experiment that was conducted within the framework of the Low-latitude ionospheric sensor network (LISN) observatory to measure the characteristics of medium-scale (hundreds of km) Traveling Ionospheric Disturbances (TIDs) as they transit through the LISN, and conclude that small and/or regional arrays of GPS receivers can be used at low latitudes to study the role that gravity waves may have on seeding plasma bubbles.
References
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