A5046089236- Ionosphere and magnetosphere dynamics
- Solar and Space Plasma Dynamics
- Atmospheric Ozone and Climate
- Geophysics and Gravity Measurements
- GNSS positioning and interference
- Earthquake Detection and Analysis
- Astro and Planetary Science
- Geomagnetism and Paleomagnetism Studies
- Oceanographic and Atmospheric Processes
- Meteorological Phenomena and Simulations
- Seismic Waves and Analysis
- Planetary Science and Exploration
- Climate variability and models
- Atmospheric aerosols and clouds
- Ocean Waves and Remote Sensing
- Atmospheric chemistry and aerosols
- Methane Hydrates and Related Phenomena
- Tropical and Extratropical Cyclones Research
- Aeolian processes and effects
- Geochemistry and Elemental Analysis
- Quantum chaos and dynamical systems
- Geography and Environmental Studies
- Spaceflight effects on biology
- Network Security and Intrusion Detection
- Cancer and Skin Lesions
Universidade Federal de Campina Grande
2016-2025
Universidade Federal do Oeste da Bahia
2017
National Institute for Space Research
1997-2014
Utah AIDS Foundation
2009
Universidade Federal da Paraíba
2001-2003
Abstract The mesosphere/lower thermosphere (MLT, 80–100 km) region is an important boundary between Earth's atmosphere below and space above may act as a sensitive indicator for anthropogenic climate change. Existing observational modeling studies have shown the middle MLT cooling contracting because of increasing greenhouse gas emissions. However, trend analyses are highly to time periods covered, their length, measurement type methodology used. We present first linear 11‐year solar cycle...
Abstract. As part of the SpreadFEx campaign, coordinated optical and radio measurements were made from Brazil to investigate occurrence properties equatorial Spread F, characterize regional mesospheric gravity wave field. All-sky image two sites: Brasilia Cariri located ~10° S magnetic equator separated by ~1500 km. In particular, observations provided key data in relatively close proximity expected convective sources waves. High-quality OH emission thermospheric OI (630 nm) during...
[1] We report on the climatology of equatorial thermospheric winds and temperatures based Fabry-Perot interferometer measurements Doppler shifts broadenings 630.0 nm spectral emission from Cajazeiras observatory located in northeastern part Brazil (6.89°S, 38.56°W). These results apply to lower thermosphere region near 240 km were obtained during a period weak solar activity with flux typically within range 72 82 units. Examination monthly averaged meridional for 1 year measurement October...
Abstract. Periodic wave structures in the thermosphere have been observed at São João do Cariri (geographic coordinates: 36.5° W, 7.4° S; geomagnetic coordinates based on IGRF model to 2015: 35.8° E, 0.48° N) from September 2000 November 2010 using OI630.0 nm airglow images. During this period, which corresponds almost one solar cycle, characteristics of 98 waves were studied. Similarities between these events and observations other places around world noted, primarily spectral parameters....
Abstract We present a climatology of quiet time thermospheric winds and temperatures estimated from high‐resolution Fabry‐Perot interferometer measurements the 630.0 nm airglow emission spectral line shape. Three locations are examined in this long‐term study: northeastern Brazil (August 2009 to August 2014), midlatitude site North Carolina, USA (June 2011 December Morocco (November 2013 2014). discuss day‐to‐day, seasonal, solar cycle trends variations meridional winds, zonal neutral...
Abstract. The Hunga Tonga–Hunga Ha′apai volcano erupted on 15 January 2022, launching Lamb waves and gravity into the atmosphere. In this study, we present results using 13 globally distributed meteor radars identify volcanogenic in mesospheric/lower thermospheric winds. Leveraging High-Altitude Mechanistic general Circulation Model (HIAMCM), compare global propagation of these waves. We observed an eastward-propagating wave packet with phase speed 240 ± 5.7 m s−1 a westward-propagating...
Abstract. Previous efforts have used pairs of closely spaced specialized receivers to measure Global Navigation Satellite System (GNSS) signals and estimate ionospheric irregularity drifts. The relatively high cost associated with commercial GNSS-based has somewhat limited their deployment the estimation development an alternative, low-cost, scintillation monitor (ScintPi) motivated us investigate possibility using it overcome this limitation. ScintPi monitors can observe from geostationary...
Abstract. Using data collected from a meteor radar deployed at São João do Cariri (7.4° S, 36.5° W) and the TIMED Doppler Interferometer (TIDI) on board Thermosphere-Ionosphere-Mesosphere Energetics Dynamics (TIMED) satellite for 2006, comparisons of horizontal winds (meridional zonal components) were made in order to evaluate above-mentioned techniques scientific investigations point out advantages each instrument. A grid ± 5° latitude longitude centered was used calculate mean TIDI, which...
<title>Abstract</title> From airglow OI 630 nm observations in the low-latitude ionosphere, we identified an enhancement emission rate inside Equatorial Plasma Bubbles (EPBs) on certain occasions after local midnight during equinox seasons. On night of 7–8 October 2021, all-sky imager, operated at Bom Jesus da Lapa (BJL) (13.3°S, 43.5°W, dip 14.1°S), observed a dark plasma bubble transitioning into bright one due to rate, phenomenon refer as "White Bubble" (WhB). Prior appearance WhB, imager...
We analyze in detail the zonal velocities of large‐scale ionospheric plasma depletions over two conjugate stations inferred from OI 630 nm airglow all‐sky images obtained during Conjugate Point Equatorial Experiment (COPEX) campaign carried out Brazil between October and November 2002. The were Boa Vista (BV) (geogr. 2.8N, 60.7W, dip angle 22.0°N) Campo Grande (CG) 20.5S, 54.7W, 22.32°S). Over Grande, measured also by a system spaced GPS scintillation receivers. at sites seen to agree very...
Abstract. We provide here an overview of, and a summary of results arising from, extensive experimental campaign (the Spread F Experiment, or SpreadFEx) performed from September to November 2005, with primary measurements in Brazil. The motivation was define the potential role neutral atmosphere dynamics, specifically gravity wave motions propagating upward lower atmosphere, seeding Rayleigh-Taylor instability (RTI) plasma bubbles extending higher altitudes. Campaign focused on Brazilian...
We present results from the first extended period of coincident observations thermospheric zonal neutral winds and equatorial plasma bubble (EPB) drift velocities over northeastern Brazil during October to December months 2009 2010. The EPB are estimated utilizing images O I 630.0 nm emissions recorded by a wide‐angle imaging system at Cajazeiras. Thermospheric wind estimates based upon common volume made bistatic Fabry‐Perot interferometer (FPI) experiment using FPIs located Cajazeiras...
Simultaneous observations of the night airglow OH (6, 2) band emission intensity and rotational temperature, by a sky scanning spectrophotometer, meteor winds, middle upper atmosphere radar (MU radar), were carried out at Shigaraki (34.9°N, 136.1°E), Japan, from October 29 to November 11, 1994, as first phase campaign, July 25 31, 1995 second phase. Horizontal structures in temperature monitored optically, together with background wind its wave induced fluctuations, measured MU radar. Since...
Abstract The generation of a large‐scale wave in the upper atmosphere caused by solar eclipse was first predicted 1970s, but experimental evidence remains sparse and comprises mostly indirect observations. This study presents observations wind component thermospheric generated 21 August 2017 total eclipse. In contrast with previous studies, are made on nightside, after ended. A ground‐based interferometer located northeastern Brazil is used to monitor Doppler shift 630.0‐nm airglow emission,...
Abstract Quasi 16‐day waves (Q16DWs) are a prominent and recurrent phenomenon in the middle atmosphere, typically observed over winter mid high latitudes. This study investigates intense Q16DW event during 2018–2019 Northern Hemisphere (NH) winter, explores its propagation atmosphere notable influence on E‐region ionosphere. Long‐term geopotential height estimates of Aura Microwave Limb Sounder (MLS) reveal that wave activity under consideration exhibited largest amplitudes mesosphere for...
Using airglow images observed at São João do Cariri (7.4ºS, 36.5ºW; dip angle: -11ºS) from September 2000 to April 2007, plasma bubblezonal drifts for ninety-seven geomagnetically quiet nights (Dst index higher than -30 nT) were calculated. The bubble eastward averaged presented an increase 18:00 22:00 local time (LT), and followed by a deceleration. bubbles during high solar activity faster after LT. Eastward the summer, 21:00 LT, equinox months. Few had 100 m/s almost all disappeared 02:00...
Abstract Planetary wave (PW) associated dynamical variability in the equatorial and extratropical middle atmosphere during September 2019 Southern hemisphere minor sudden stratospheric warming (SSW) is investigated utilizing meteor radar wind observations from São João do Cariri (7.4°S, 36.5°W) Cachoeira Paulista (22.7°S, 45°W) reanalysis data. Signature of mesospheric conjunction with cooling found at low latitudes. The strong westerly latitudes decelerates notably near 65 km onset episode,...
Abstract. Mesospheric winds observed with a meteor radar at Cariri (7.4° S, 36.5° W), Brazil, during the period of July 2004 to June 2005, show clear semiannual oscillation known as Semiannual Oscillation (MSAO), which maximizes in zonal mean wind mainly 82 km, amplitude decreasing height. Maximum westward for MSAO occurred March and September. The meridional wind, on other hand, presented annual variation maximizing December. On average, was smaller than component. Comparison models shows...