Skip to content
Home
About Us
Resources
Profiles Metrics
Authors Directory
Institutions Directory
Top Authors
Top Institutions
Top Sponsors
AI Digest
Contact Us
Menu
Home
About Us
Resources
Profiles Metrics
Authors Directory
Institutions Directory
Top Authors
Top Institutions
Top Sponsors
AI Digest
Contact Us
Home
About Us
Resources
Profiles Metrics
Authors Directory
Institutions Directory
Top Authors
Top Institutions
Top Sponsors
AI Digest
Contact Us
Menu
Home
About Us
Resources
Profiles Metrics
Authors Directory
Institutions Directory
Top Authors
Top Institutions
Top Sponsors
AI Digest
Contact Us
Publication Details
AFRICAN RESEARCH NEXUS
SHINING A SPOTLIGHT ON AFRICAN RESEARCH
earth and planetary sciences
On equatorial geophysics studies: A review on the IGRGEA results during the last decade
Journal of Atmospheric and Solar-Terrestrial Physics, Volume 67, No. 4, Year 2005
Notification
URL copied to clipboard!
Description
During the years 1993-1994, a continuous campaign of measurements has been held in the frame of the International Equatorial Electrojet Year (IEEY) with a network of 10 magneto-telluric stations and a network of three ionosondes. Other instruments have participated during shorter periods, HF radar and optical Fabry-Perot 630 nm interferometer. After the IEEY campaigns, the International Group of Research in Geophysics in Europe Africa (IGRGEA created in January 1995), has organized the research in geophysics. This paper report the main results of the IGRGEA during the last decade at local, regional and planetary scales. At a local scale, the HF radar data highlighted the complex structure of echoes in the equatorial zone and allowed to explain the "necklace" echoes as due to oblique propagation into the type I instability levels. This radar observed atmospheric storm electric field discharges at Es layer for the daytime and Equatorial Spread F at night-time. A series of original results concern Doppler spectra and the electric field change on plasma drifts across the ionosphere, gravity waves effects as well the ESF multi-process sources. At a regional scale, magnetic data were used to parametrize the Equatorial Electrojet (EEJ). Ionospheric data, magnetic data and UARS satellite were brought together as input parameters of the Richmond's EEJ model to reproduce the EEJ and the magnetic field variations associated to EEJ. The comparisons between magnetic data, and the magnetic field computed from the physical model and from the parametrization of the EEJ are all in good agreement. Ionosonde data were included in the IRI. Ionosonde data revealed the field aligned f0F2 crests of ionization at mid morning and early afternoon hours. Measurements of equatorial night-time wind variations, obtained for the first time over African equatorial zone with the Fabry-Perot interferometer, shown the strong variability of atmospheric winds. At a planetary scale, the parametrization of the EEJ was done using the magnetometers chain involved during IEEY in the three longitude sectors. Finally, we present the results on electrodynamic coupling between high and low latitudes with overshielding or shielding events. © 2004 Elsevier Ltd. All rights reserved.
Authors & Co-Authors
Amory-Mazaudier, Christine
France, Guyancourt
Laboratoire Atmosphères, Observations Spatiales
Kobea, Arsène Toka
France, Abidjan
Université de Cocody
Vila, Paul Marcel
France, Guyancourt
Laboratoire Atmosphères, Observations Spatiales
Achy-Séka, A.
France, Abidjan
Université de Cocody
Blanc, Elisabeth
France, Gif-sur-yvette
Commissariat a L'energie Atomique et Aux Energies Alternatives
Boka, Kouadio
France, Abidjan
Université de Cocody
Bouvet, J.
France, Guyancourt
Laboratoire Atmosphères, Observations Spatiales
Cécile, J. F.
France, Gif-sur-yvette
Commissariat a L'energie Atomique et Aux Energies Alternatives
Cohen, Yves
France, Paris
Institut de Physique du Globe de Paris
Curto, J. J.
Spain, Tarragona
Observatorio de Ebre
Dukhan, Michel
France, Bondy
Ird Centre D'ile-de-france
Doumouya, V.
France, Abidjan
Université de Cocody
Fambitakoye, O.
France, Bondy
Ird Centre D'ile-de-france
Farges, Thomas
France, Gif-sur-yvette
Commissariat a L'energie Atomique et Aux Energies Alternatives
Goutelard, Claude
France, Nanterre
Université Paris Nanterre
Guisso, E.
France, Abidjan
Université de Cocody
Hanbaba, R.
France, Issy-les-moulineaux
Orange Labs
Houngninou, E.
France, Abidjan
Université de Cocody
Kone, E.
France, Abidjan
Université de Cocody
Lassudrie-Duchesne, P.
France, Issy-les-moulineaux
Orange Labs
Lathuillere, C.
France, Saint Martin D'heres
Institut de Planétologie et D’astrophysique de Grenoble Ipag
Leroux, Y.
France, Issy-les-moulineaux
Orange Labs
Menvielle, Michele
France, Guyancourt
Laboratoire Atmosphères, Observations Spatiales
Obrou, E.
France, Abidjan
Université de Cocody
Petitdidier, Monique
France, Guyancourt
Laboratoire Atmosphères, Observations Spatiales
Ogunade, S. O.
Nigeria
University of Obafemi
Onwumechili, C. Agodi
Unknown Affiliation
Rees, D.
United States, Logan
Utah State University
Sambou, E.
Senegal, Dakar
Université Cheikh Anta Diop de Dakar
Sow, M.
France, Abidjan
Université de Cocody
Vassal, Jacques
France, Bondy
Ird Centre D'ile-de-france
Statistics
Citations: 31
Authors: 31
Affiliations: 12
Identifiers
Doi:
10.1016/j.jastp.2004.10.001
ISSN:
13646826