| Full text | |
| Author(s): |
de Meneses, F. C.
;
Klimenko, M. V.
;
Klimenko, V. V.
;
Alam Kherani, E.
;
Muralikrishna, P.
;
Xu, Jiyao
;
Hasbi, A. M.
Total Authors: 7
|
| Document type: | Journal article |
| Source: | JOURNAL OF ATMOSPHERIC AND SOLAR-TERRESTRIAL PHYSICS; v. 103, p. 12-pg., 2013-10-01. |
| Abstract | |
Simultaneous in-situ measurements of electron density and temperature in the nighttime equatorial region were performed by a rocket experiment launched under solar minimum and geomagnetic quiet conditions from the station of Alcantara (2.24 degrees S; 44.24 degrees W), Brazil, on Dec. 18, 1995, 21:17 LT. These measurements detected during the upleg flight a large overheated area around the base of density profile. The presence of plasma bubbles was revealed during the downleg phase, as well as temperature enhancements detected preferentially at altitudes where plasma depletions are found. It was assumed that the region traversed by the rocket during the downleg was preceded before the bubble's onset by a large overheating as observed during the upleg flight. Analyzing this framework under the light of the Global Self-Consistent Model of the Thermosphere, Ionosphere and Protonosphere (GSM TIP), as well as a 2D numerical code that simulate the growth of an instability and the evolution of thermal energy inside a bubble, we found that despite an overheated area in the F-region bottomside can disturb the electron density profile around the altitude interval where such heat is deposited, it seems not have a direct influence over parameters responsible for the bubble onset. Additionally, the phenomenon of the intra-bubble thermal enhancement could be formed due to the convection of hot-electron fluid transported from the overheated region surrounding the base of the F-region to upper altitudes by the underlying mechanism of bubble generation. (C) 2013 Elsevier Ltd. All rights reserved. (AU) | |
| FAPESP's process: | 12/05924-3 - Traveling ionospheric disturbances: Simulation and Observation, the importance of latitudinal coupling of gravity wave-Perkins-Es layer instabilities and forcing from pre-seismic events |
| Grantee: | Esfhan Alam Kherani |
| Support Opportunities: | Scholarships in Brazil - Young Researchers |