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Overview and summary of the Spread F Experiment (SpreadFEx)

Fritts, D. C. and Abdu, M. A. and Batista, B. R. and Batista, I. S. and Batista, P. P. and Buriti, R. and Clemesha, B. R. and Dautermann, Thomas and de Paula, E. R. and Fechine, B. J. and Fejer, B. G. and Gobbi, D. and Haase, J. and Kamalabadi, F. and Kherani, E. A. and Laughman, B. and Lima, P. P. and Liu, H.-L. and Medeiros, A. and Pautet, P.-D. and Riggin, D. M. and Rodrigues, F. S. and São Sabbas, F. and Sobral, J. H. A. and Stamus, P. and Takahashi, H. and Taylor, M. J. and Vadas, S. L. and Vargas, F. and Wrasse, C. M. (2009) Overview and summary of the Spread F Experiment (SpreadFEx). Annales Geophysicae, 27 (5), pp. 2141-2155. Copernicus GmbH (Copernicus Publications) on behalf of the European Geosciences Union (EGU).

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Official URL: http://www.ann-geophys.net/27/2141/2009/angeo-27-2141-2009.html

Abstract

We provide here an overview of, and a summary of results arising from, an extensive experimental campaign (the Spread F Experiment, or SpreadFEx) performed from September to November 2005, with primary measurements in Brazil. The motivation was to define the potential role of neutral atmosphere dynamics, specifically gravity wave motions propagating upward from the lower atmosphere, in seeding Rayleigh-Taylor instability (RTI) and plasma bubbles extending to higher altitudes. Campaign measurements focused on the Brazilian sector and included ground-based optical, radar, digisonde, and GPS measurements at a number of fixed and temporary sites. Related data on convection and plasma bubble structures were also collected by GOES 12, and the GUVI instrument aboard the TIMED satellite. Initial results of our SpreadFEx analyses are described separately by Fritts et al. (2009). Further analyses of these data provide additional evidence of 1) gravity wave (GW) activity near the mesopause apparently linked to deep convection predominantly to the west of our measurement sites, 2) small-scale GWs largely confined to lower altitudes, 3) larger-scale GWs apparently penetrating to much higher altitudes, 4) substantial GW amplitudes implied by digisonde electron densities, and 5) apparent influences of these perturbations in the lower F-region on the formation of equatorial spread F, RTI, and plasma bubbles extending to much higher altitudes. Other efforts with SpreadFEx data have also yielded 6) the occurrence, locations, and scales of deep convection, 7) the spatial and temporal evolutions of plasma bubbles, 8) 2-D (height-resolved) structures in electron density fluctuations and equatorial spread F at lower altitudes and plasma bubbles above, and 9) the occurrence of substantial tidal perturbations to the large-scale wind and temperature fields extending to bottomside F-layer and higher altitudes. Collectively, our various SpreadFEx analyses suggest direct links between deep tropical convection and large GW perturbations at large spatial scales at the bottomside F-layer and their likely contributions to the excitation of RTI and plasma bubbles extending to much higher altitudes.

Document Type:Article
Title:Overview and summary of the Spread F Experiment (SpreadFEx)
Authors:
AuthorsInstitution or Email of Authors
Fritts, D. C.NorthWest Research Associates
Abdu, M. A.UNSPECIFIED
Batista, B. R.UNSPECIFIED
Batista, I. S.UNSPECIFIED
Batista, P. P.UNSPECIFIED
Buriti, R.UNSPECIFIED
Clemesha, B. R.UNSPECIFIED
Dautermann, Thomasthomas.dautermann@dlr.de
de Paula, E. R.UNSPECIFIED
Fechine, B. J.UNSPECIFIED
Fejer, B. G.UNSPECIFIED
Gobbi, D.UNSPECIFIED
Haase, J.Purdue University
Kamalabadi, F.UNSPECIFIED
Kherani, E. A.UNSPECIFIED
Laughman, B.UNSPECIFIED
Lima, P. P.UNSPECIFIED
Liu, H.-L.UNSPECIFIED
Medeiros, A.UNSPECIFIED
Pautet, P.-D.UNSPECIFIED
Riggin, D. M.UNSPECIFIED
Rodrigues, F. S.UNSPECIFIED
São Sabbas, F.UNSPECIFIED
Sobral, J. H. A.UNSPECIFIED
Stamus, P.UNSPECIFIED
Takahashi, H.UNSPECIFIED
Taylor, M. J.UNSPECIFIED
Vadas, S. L.UNSPECIFIED
Vargas, F.UNSPECIFIED
Wrasse, C. M.UNSPECIFIED
Date:11 May 2009
Journal or Publication Title:Annales Geophysicae
Refereed publication:Yes
In Open Access:Yes
In SCOPUS:Yes
In ISI Web of Science:Yes
Volume:27
Page Range:pp. 2141-2155
Editors:
EditorsEmail
Kofman, WlodekUNSPECIFIED
Publisher:Copernicus GmbH (Copernicus Publications) on behalf of the European Geosciences Union (EGU)
Status:Published
Keywords:Plasma Bubbles; Ionosphere;Equatorial Spread F; Geomagnetism
HGF - Research field:Aeronautics, Space and Transport (old)
HGF - Program:Space (old)
HGF - Program Themes:W - no assignement
DLR - Research area:Space
DLR - Program:W - no assignement
DLR - Research theme (Project):W -- no assignement (old)
Location: Oberpfaffenhofen
Institutes and Institutions:Institute of Communication and Navigation
Institute of Communication and Navigation > Navigation
Deposited By: Dr. Thomas Dautermann
Deposited On:17 Dec 2009 12:00
Last Modified:12 Dec 2013 20:46

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