Journal ArticleDOI
Ionospheric plasma bubble climatology over Brazil based on 22 years (1977–1998) of airglow observations
J. H. A. Sobral,M. A. Abdu,H. Takahashi,Michael J. Taylor,E. R. de Paula,C.J. Zamlutti,M. G. de Aquino,G.L. Borba +7 more
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TLDR
In this paper, the frequency of large-scale ionospheric plasma depletions, or plasma bubbles, over Cachoeira Paulista, with solar activity, season, and geomagnetic activity, during the period of 1977-1998, was studied based on 934 days of scanning photometers and imagers data of the atomic oxygen 630 nm nocturnal airglow.About:
This article is published in Journal of Atmospheric and Solar-Terrestrial Physics.The article was published on 2002-08-01. It has received 129 citations till now. The article focuses on the topics: Solar maximum.read more
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Simultaneous observation of ionospheric plasma bubbles and mesospheric gravity waves during the SpreadFEx Campaign
H. Takahashi,Michael J. Taylor,Pierre-Dominique Pautet,Amauri Fragoso de Medeiros,Delano Gobbi,Cristiano Max Wrasse,Joaquim Fechine,M. A. Abdu,Inez S. Batista,Eurico R. de Paula,J. H. A. Sobral,Daniela C. S. Arruda,Sharon L. Vadas,F. S. Sabbas,David C. Fritts +14 more
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.
Journal ArticleDOI
Equatorial ionosphere–thermosphere system: Electrodynamics and irregularities
TL;DR: In this paper, the authors focus on the ambient conditions of the ionosphere-thermosphere system and the electro dynamics and plasma instability processes that govern the plasma irregularity generation.
Journal ArticleDOI
Conjugate Point Equatorial Experiment (COPEX) Campaign in Brazil: Electrodynamics highlights on spread F development conditions and day-to-day variability
M. A. Abdu,Inez S. Batista,Bodo W. Reinisch,J.R. de Souza,J. H. A. Sobral,Todd Pedersen,Amauri Fragoso de Medeiros,Nelson Jorge Schuch,E. R. de Paula,Keith M. Groves +9 more
TL;DR: In this article, the authors analyze the extensive Digisonde data from the COPEX stations, complemented by limited all-sky imager conjugate point observations, presenting a perspective on the ESF day-to-day and medium-term variabilities.
Journal ArticleDOI
Toward a synthesis of equatorial spread F onset and suppression during geomagnetic storms
TL;DR: In this article, the development of equatorial irregularities during magnetically active periods can be understood using the AE-parameterized Fejer-Scherliess model for disturbance vertical drifts versus storm time and local time.
Journal ArticleDOI
On the occurrence of equatorial F-region irregularities during solar minimum using radio occultation measurements
TL;DR: In this paper, the authors used radio occultation (RO) to study equatorial F-region irregularities (EFIs) associated with equatorial plasma bubbles and found that the EFI occurrence statistics largely match those reported previously, with the exception of an equinoctial E FI occurrence maximum in the American sector that is absent from previous studies.
References
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Radar observations of F region equatorial irregularities
Ronald F. Woodman,Cesar La Hoz +1 more
TL;DR: In this paper, the results of backscatter observations of the F region irregularities made with the large 50MHz radar at Jicamarca, Peru, during a few days of observations are presented.
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Effects of the vertical plasma drift velocity on the generation and evolution of equatorial spread F
TL;DR: In this paper, the authors used radar observations from the Jicamarca Observatory from 1968 to 1992 to study the effects of the F region vertical plasma drift velocity on the generation and evolution of equatorial spread F.
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Average vertical and zonal F region plasma drifts over Jicamarca
TL;DR: The seasonal average of the equatorial F region vertical and zonal plasma drifts were determined using extensive incoherent scatter radar observations from Jicamarca during 1968-1988.
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Control of the seasonal and longitudinal occurrence of equatorial scintillations by the longitudinal gradient in integrated E region Pedersen conductivity
TL;DR: In this article, the seasonal maxima in scintillation activity coincide with the times of year when the solar terminator is most nearly aligned with the geomagnetic flux tubes, and the occurrence of plasma density irregularities responsible for scintillations is most likely when the integrated E-region Pedersen conductivity is changing most rapidly.
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Storm time dependence of equatorial disturbance dynamo zonal electric fields
Ludger Scherliess,Bela G. Fejer +1 more
TL;DR: In this article, the authors used Jicamarca radar observations of F region vertical plasma drifts and auroral electrojet indices during 1968-1988 to study the characteristics and temporal evolution of equatorial disturbance dynamo zonal electric fields.