A5016190744- Ionosphere and magnetosphere dynamics
- Solar and Space Plasma Dynamics
- Atmospheric Ozone and Climate
- GNSS positioning and interference
- Earthquake Detection and Analysis
- Geophysics and Gravity Measurements
- Atmospheric and Environmental Gas Dynamics
- Astro and Planetary Science
- Geomagnetism and Paleomagnetism Studies
- Climate variability and models
- Geography and Environmental Studies
- Ocean Waves and Remote Sensing
- Plasma Diagnostics and Applications
- Tropical and Extratropical Cyclones Research
- Astronomical Observations and Instrumentation
- Nuclear Physics and Applications
- Meteorological Phenomena and Simulations
- Planetary Science and Exploration
- Atmospheric aerosols and clouds
- Coastal and Marine Dynamics
- Precipitation Measurement and Analysis
- Atmospheric chemistry and aerosols
- Calibration and Measurement Techniques
- Cerebrovascular and Carotid Artery Diseases
- Science and Science Education
National Institute for Space Research
2015-2025
National Space Science Center
2016-2025
Chinese Academy of Sciences
2017-2025
State Key Laboratory of Space Weather
2020-2024
Centrum Badań Jakości
2021
Chinese Academy of Meteorological Sciences
2019
Northwest Research Associates
2011
Universidade Federal de Santa Maria
2005-2007
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. 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. The advantages of using a composite day analysis for all-sky interferometric meteor radars when measuring mean winds and tides are widely known. On the other hand, problems arise if this technique is applied to Hocking's (2005) gravity wave radars. In paper we describe how simple change in procedure makes it possible use analysis. Also, explain modified can be constructed test its ability measure momentum fluxes. Test results specified mean, tidal, fields, including tidal...
In the present work, we analyze competition between tidal winds and electric fields in formation of blanketing sporadic E layers (Esb) over São Luís, Brazil (2° 31′ S, 44° 16′ W), a quasi-equatorial station. To investigate this competition, have used an ionospheric region model (MIRE) that is able to Esb taking into account fields. The calculates densities for main molecular metallic ions by solving continuity momentum equations each species. Thus, purpose analysis verify role occurrence or...
Spread echoes from the E-region observed in ionograms obtained at high latitudes are generally classified as auroral sporadic-E (Esa) layers. These layers have also been detected nighttime collected some ionospheric stations South American Magnetic Anomaly (SAMA) region Brazil during recovery phases of geomagnetic storms. However, similar SAMA geomagnetically quiet periods or daytime, which not caused by energetic particle precipitation. Therefore, investigating occurrence these spread over...
This work investigates a slightly-deformed cloud of enhanced mesospheric sodium (Na) and potassium (K) layers registered on 24 June 2023 by the dual-beam Na/K LIDAR system operating over low-latitude sector São José dos Campos - Brazil (23.1°S; 45.9°W), region under influence South Atlantic Magnetic Anomaly (SAMA). In this event, these peculiar metal clouds presented strong quick intensification with vertical extension ∼4 km duration only few minutes. At same time, evidence Energetic...
This study utilizes 3 years of observational data from the China-Brazil Joint Laboratory for Space Weather (CBJLSW) dual-beam Na-K LIDAR to investigate fast-type sporadic sodium (Na) and potassium (K) layers. The focus is on sudden enhancement these metal densities within thin layers, duration which less than 1 hour. These transient layers were identified in five nights always located a few hundred meters above main Na K There was good correspondence between Ns layer occurrence Sporadic-E...
Abstract This study analyzes strong sporadic E layer (Es) formation in Boa Vista (BV, 2.8°N, 60.7°W, dip: 18°), a low‐latitude region the Brazilian sector, which occurred far after onset of magnetic storm recovery phase. Such occurrences were observed during seven storms with available data for BV. Thus, ionospheric behavior on days around that 20 January 2016 was investigated to search possible explanations. analysis indicated probable mechanism acting Es strengthening is zonal westward...
Abstract. A mesospheric front was observed with an all-sky airglow imager on the night of 9–10 July 2007 at Ferraz Station (62° S, 58° W), located King George island Antarctic Peninsula. The wave propagated from southwest to northeast a well defined and series crests behind main front. parameters were obtained via 2-D Fourier transform data providing horizontal wavelength 33 km, period 6 min, phase speed 92 m s−1. Simultaneous winds measured medium frequency (MF) radar Rothera (68° 68° W)...
Abstract During disturbed periods, E region electric fields can cause anomalous Es layer behavior, which is observed in the digital ionosonde data. To investigate influence of these development, we analyzed a set 20 magnetic storms from 2015 to 2018 over Boa Vista (BV, 2.8°N, 60.7°W, dip ∼18°), São Luís (SLZ, 2.3°S, 44.2°W, ∼8°), and Cachoeira Paulista (CXP, 22.41°S, 45°W, ∼35°). The field zonal components during main recovery phases each storm are computed study corresponding...
Abstract Mesospheric winds have been measured by meteor radar at Cachoeira Paulista (22.7°S; 45°W) since April 1999. The tidal components were analyzed over about 21 years of available data exhibiting an annual and semi‐annual variation. Amplitudes meridional diurnal (semidiurnal) tide are on averaged 30% (28%) the zonal ones 14% (20%) stronger solar minimum than maximum. anticorrelation between F10.7 cm flux amplitudes semiannual oscillation semidiurnal tides is presented. Additionally,...
Abstract. Sporadic E (Es) layers are patches of high ionization observed at around 100–140 km height in the region. Their formation low latitudes is primarily associated with diurnal and semidiurnal components tidal winds via ion convergence driven by wind shear mechanism. However, recent studies have shown influence other modes, such as terdiurnal tide. Therefore, this work investigates effect tide-like oscillations on occurrence Es over Palmas (10.17∘ S, 48.33∘ W; dip lat. −7.31∘), a...
Abstract. We have applied a modified composite day analysis to the Hocking (2005) technique study gravity wave (GW) momentum fluxes in mesosphere and lower thermosphere (MLT). Wind measurements from almost continuous meteor radar observations during June 2004–December 2008 over São João do Cariri (Cariri; 7° S, 36° W), April 1999–November Cachoeira Paulista (CP; 23° 45° February 2005–December 2009 Santa Maria (SM; 30° 54° W) were used estimate GW variances MLT region. Our can provide monthly...
Abstract Equatorial E region electric fields (EEFs) inferred from coherent radar data, sporadic‐ ( s ) layers observed a digital ionosonde and modeling results are used to study the responses of equatorial over São Luís (SLZ, 2.3°S, 44.2°W, ~−7° dip angle), Brazil, during super storm November 2004. The EEF is presented in terms zonal y vertical z components order analyze corresponding characteristics different types seen ionograms simulated with ionospheric model. We bring out variabilities...
Abstract In this work, the occurrence of different types sporadic‐ E layers ( Es ) was described for two stations located in region South America Magnetic Anomaly: Jataí and São José dos Campos. The results show hourly monthly values occurrences presented five (cusp, high, flat, low, slant), with flat/low f/l being most frequent over both stations. We also analyzed layer parameters blanketing frequency f b top t obtained from ionosonde data during storm‐time periods, order to investigate...
Abstract. The temperature trend in the mesosphere and lower-thermosphere (MLT) region can be regarded as an indicator of climate change. Using profiles measured by Sounding Atmosphere using Broadband Emission Radiometry (SABER) instrument during 2002–2023 binning them based on yaw cycle, we obtain a continuous dataset with wide local time coverage at 50° S–80° N or 80° S–50° N. seasonal change temperature, caused forward drift SABER is removed climatological Naval Research Laboratory's Mass...
Abstract. On 16–17 July 2007 during an observational campaign at Comandante Ferraz Antarctic Station (62° S, 58° W), a mesospheric wall was observed with airglow all-sky imager. The wave appeared like extensive dark region in the images, large depletion OH emission. Simultaneous winds measured MF radar Rothera station and temperature profiles from SABER instrument, on board of TIMED satellite, were used to obtain propagation condition wave. Wind measurements four days, around time...
We present a study about the atypical and spreading Sporadic E-layers (Es) observed in Digisonde data. analyzed set of days around space weather events from 2016 to 2018 over Cachoeira Paulista (CXP, 22.41°S, 45°W, dip ∼35°), low-latitude Brazilian station. The inhomogeneous Es layer is associated with auroral-type (Es ) occurrence this region due presence South American Magnetic Anomaly (SAMA). However, we also observe that layers occurred before magnetic storms or quiet times. Also,...
Abstract. We employ a modified composite day extension of the Hocking (2005) analysis method to study gravity wave (GW) activity in mesosphere and lower thermosphere using 4 meteor radars spanning latitudes from 7° S 53.6° S. Diurnal semidiurnal modulations were observed GW variances over all sites. Semidiurnal modulation with downward phase propagation was at mainly near equinoxes. occur solstice and, except for zonal component Cariri (7° S), do not exhibit propagation. At higher latitude...