%0 Journal Article
%3 fulltext.pdf
%4 sid.inpe.br/mtc-m18@80/2008/07.15.14.55
%8 June
%@issn 1364-6826
%A McNamara, Leo F.,
%A Retterer, John M.,
%A Abdu, Mangalathayil Ali,
%A Batista, Inez S.,
%A Reinisch, Bodo W.,
%@secondarytype PRE PI
%B Journal of Atmospheric and Solar-Terrestrial Physics
%D 2008
%F self-archiving-INPE-MCTIC-GOV-BR
%@secondarykey INPE--PRE/
%K Ionosphere (equatorial ionosphere, Ionospheric irregularities, Instruments and techniques).
%@archivingpolicy denypublisher denyfinaldraft24
%N 8-9
%P 1133-1242
%@secondarymark A_ENGENHARIAS_IV A_GEOCIÊNCIAS A_INTERDISCIPLINAR B_ASTRONOMIA_/_FÍSICA
%T F2 Peak parameters, drifts and spread F derived from digisonde ionograms for the COPEX campaign in Brazil
%V 70
%X Digisonde ionograms recorded in Brazil during the COPEX campaign of 2002 have been analyzed to determine the diurnal variations of the F2 peak parameters (foF2, hmF2 and the Chapman scale height, Hm) for the three COPEX stations, Boa Vista, Cachimbo and Campo Grande. Values of foF2 were derived at 15-min intervals for UT days 278298. The autoscaled F2 traces for all ionograms recorded on several days were modified manually as required and then used to derive the F2 peak parameters. The Cachimbo ionograms have also been analyzed to determine the post-sunset vertical drifts and the occurrence of spread F echoes at the magnetic equator. Spread F occurred on 90% of the nights at all three sites, limiting the number of ionograms that provide well-defined peak parameters during these conditions. The ionograms provide a wealth of details not previously reported for equatorial locations, and not predicted by current models of the equatorial ionosphere. In this paper, we discuss the correlation between the observed vertical drifts and the occurrence of spread F echoes, describe the short-term variability of the three peak parameters, and provide brief interpretations of this variability in terms of the processes that control plasma production and transport.
%@area CEA
%@documentstage not transferred
%@group
%@group
%@group DAE-CEA-INPE-MCT-BR
%@group DAE-CEA-INPE-MCT-BR
%@dissemination WEBSCI; PORTALCAPES; AGU.
%@usergroup administrator
%@usergroup banon
%@usergroup marciana
%@nexthigherunit 8JMKD3MGPCW/3ETL868
%@affiliation Institute for Scientific Research, Boston College, Chestnut Hill, MA, USA
%@affiliation Air Force Research Laboratory, Research Vehicles Directorate, Hanscom Air Force Base, Massachusetts
%@affiliation Instituto Nacional de Pesquisas Espaciais (INPE)
%@affiliation Instituto Nacional de Pesquisas Espaciais (INPE)
%@affiliation Center for Atmospheric Research, University of Massachusetts Lowell, Lowell, MA, USA
%@versiontype publisher
%@holdercode {isadg {BR SPINPE} ibi 8JMKD3MGPCW/3DT298S}
%@doi 10.1016/j.jastp.2008.02.001
%2 sid.inpe.br/mtc-m18@80/2008/07.15.14.55.29