Equatorial ionosphere bottom‐type spread F observed by OI 630.0 nm airglow imaging
H. Takahashi,M. A. Abdu,Michael J. Taylor,Pierre-Dominique Pautet,E. R. de Paula,Esfhan alam Kherani,Amauri Fragoso de Medeiros,Cristiano Max Wrasse,I. S. Batista,J. H. A. Sobral,Delano Gobbi,Daniela C. S. Arruda,Igo Paulino,Sharon L. Vadas,D. C. Fritts +14 more
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In this article, bottom-type spread F events were observed in the south American equatorial region by a VHF coherent radar and an ionosonde at Sao Luis (2.5°S, 44.3°W).Abstract:
[1] Bottom-type spread F events were observed in the south American equatorial region by a VHF coherent radar and an ionosonde at Sao Luis (2.5°S, 44.3°W), an ionosonde at Fortaleza (3.9°S, 38.4° W) and an airglow OI 630.0 nm imager at Cariri (7.4°S, 36.5°W) and Brasilia (14.8°S, 47.6°W). In the evening of September 30, 2005, a long duration (∼70 minutes) bottom side scattering layer, confined in a narrow height region, was observed. At the same time all-sky imager observed sinusoidal intensity depletions in the zonal plane extending more than 1500 km and elongated along the magnetic meridian. No strong spread F structures developed during the period. Subsequently well developed plasma bubbles were observed. This suggests that the observed bottom-type spread F is an initial phase of the plasma bubbles. We report, for the first time, longitudinal and latitudinal extension of the bottom-type spread F as diagnosed by optical imagers.read more
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TL;DR: In this article, two airglow CCD imagers, located at Cariri (7.4° S, 36.5° W, geomag. 11° S) and near Brasilia (14.8°S, 47.6°W, geOMag. 10°S) were operated simultaneously and measured the equatorial ionospheric bubbles and their time evolution by monitoring the airglove OI 6300 intensity depletions.
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