Options
Le Huy, Minh
Loading...
Preferred name
Le Huy, Minh
5 results
Now showing 1 - 5 of 5
- PublicationOpen AccessScintillation events over Vietnam on April 2006(2010-06-07)
; ; ; ; ; ; ; ; ;Alfonsi, Lucilla; Istituto Nazionale di Geofisica e Vulcanologia, Sezione Roma2, Roma, Italia ;Spogli, Luca; Istituto Nazionale di Geofisica e Vulcanologia, Sezione Roma2, Roma, Italia ;Tong, Jenna R.; Department of Electronic and Electrical Engineering, University of Bath ;De Franceschi, Giorgiana; Istituto Nazionale di Geofisica e Vulcanologia, Sezione Roma2, Roma, Italia ;Romano, Vincenzo; Istituto Nazionale di Geofisica e Vulcanologia, Sezione Roma2, Roma, Italia ;Bourdillon, Alain; Institut d’Electronique et de Te´ le´communications de Rennes (IETR), University of Rennes ;Le Huy, Minh; Vietnam Academy of Science and Technology (VAST), Institute of Geophysics ;Mitchell, Cathryn M.; Department of Electronic and Electrical Engineering, University of Bath; ; ; ; ; ; ; ; ; ; ;Hernandez-Pajares, Manuel; Technical University of Catalonia ;Doherty, Patricia; Boston College; In Vietnam, at Hue (16.4°N, 107.6°E) and Hoc Mon (10.9°N, 106.6°E), are located two GPS receivers specially modified for recording, at a sampling rate of 50 Hz, the phase and the amplitude of the L1 signal and the Total Electron Content (TEC) from L1 and L2. In April 2006 both the receivers have observed post-sunset scintillation inhibition when moderate magnetic storms occurred. These measurements together with a 3D plus time imaging of the ionosphere produced by the Multi-Instrument Data Analysis System (MIDAS) have revealed interesting features that will be described in the present paper. MIDAS allows the characterization of the TEC condition over the interested area supporting the speculation on the causes resulting on scintillating GPS signals received at ground. The results confirm the role of the ring current on the generation of the equatorial F layer small-scale irregularities, in relationship with the observed inhibition of scintillations during the storms. The case studies will be discussed also by looking at the different conditions of the Interplanetary Magnetic Field (IMF), to attempt a description of the scintillation effects over a region scarcely investigated in the open literature.177 121 - PublicationRestrictedGPS scintillation and TEC gradients at equatorial latitudes in April 2006(2011-05-17)
; ; ; ; ; ; ; ; ;Alfonsi, Lu.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione Roma2, Roma, Italia ;Spogli, L.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione Roma2, Roma, Italia ;Tong, J. R.; Department of Electronic and Electrical Engineering, University of Bath, Bath BA2 7AY, United Kingdom ;De Franceschi, G.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione Roma2, Roma, Italia ;Romano, V.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione Roma2, Roma, Italia ;Bourdillon, A.; Institut d’Electronique et de Te´ le´communications de Rennes (IETR), University of Rennes, Baˆt11D, Campus de Beaulieu 35042 Rennes Cedex, France ;Le Huy, M.; Vietnam Academy of Science and Technology (VAST), Institute of Geophysics, Box 411 Buudien Boho, Hanoi, Vietnam ;Mitchell, C. N.; Department of Electronic and Electrical Engineering, University of Bath, Bath BA2 7AY, United Kingdom; ; ; ; ; ; ; We use observations of ionospheric scintillation at equatorial latitudes from two GPS receivers specially modified for recording, at a sampling rate of 50 Hz, the phase and the amplitude of the L1 signal and the Total Electron Content (TEC) from L1 and L2. The receivers, called GISTM (GPS Ionospheric Scintillation and TEC Monitor), are located in Vietnam (Hue, 16.4 N, 107.6 E; Hoc Mon, 10.9 N, 106.6 E). These experimental observations are analysed together with the tomographic reconstruction of the ionosphere produced by the Multi-Instrument Data Analysis System (MIDAS) for investigating the moderate geomagnetic storm which occurred on early April 2006, under low solar activity. The synergic adoption of the ionospheric imaging and of the GISTM measurements supports the identification of the scale-sizes of the ionospheric irregularities causing scintillations and helps the interpretation of the physical mechanisms generating or inhibiting the appearance of the equatorial F layer irregularities. In particular, our study attributes to the turning of the IMF (Interplanetary Magnetic Field) between northward and southward direction an important role in the inhibition of the generation of spread F irregularities resulting in a lack of scintillation enhancement in the post-sunset hours. 2010 COSPAR. Published by Elsevier Ltd. All rights reserved.349 46 - PublicationRestrictedAnalysis of the Regional Ionosphere at Low Latitudes in Support of the Biomass ESA Mission(2018-11)
; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; Biomass is a spaceborn polarimetric P-band (435 MHz) synthetic aperture radar (SAR) in a dawn–dusk low Earth orbit. Its principal objective is to measure biomass content and change in all the Earth’s forests. The ionosphere introduces the Faraday rotation on every pulse emitted by low-frequency SAR and scintillations when the pulse traverses a region of plasma irregularities, consequently impacting the quality of the imaging. Some of these effects are due to total electron content (TEC) and its gradients along the propagation path. Therefore, an accurate assessment of the ionospheric morphology and dynamics is necessary to properly understand the impact on image quality, especially in the equatorial and tropical regions. To this scope, we have conducted an in-depth investigation of the significant noise budget introduced by the two crests of the equatorial ionospheric anomaly (EIA) over Brazil and Southeast Asia. This paper is characterized by a novel approach to conceive a SAR-oriented ionospheric assessment, aimed at detecting and identifying spatial and temporal TEC gradients, including scintillation effects and traveling ionospheric disturbances, by means of Global Navigation Satellite Systems ground-based monitoring stations. The novelty of this approach resides in the customization of the information about the impact of the ionosphere on SAR imaging as derived by local dense networks of ground instruments operating during the passes of Biomass spacecraft. The results identify the EIA crests as the regions hosting the bulk of irregularities potentially causing degradation on SAR imaging. Interesting insights about the local characteristics of low-latitudes ionosphere are also highlighted.1282 9 - PublicationOpen AccessFormation of ionospheric irregularities over Southeast Asia during the 2015 St. Patrickˈs Day storm(2016-12-29)
; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ;Spogli, L.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione Roma2, Roma, Italia ;Cesaroni, C.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione Roma2, Roma, Italia ;Di Mauro, D.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione Roma2, Roma, Italia ;Pezzopane, M.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione Roma2, Roma, Italia ;Alfonsi, Lu.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione Roma2, Roma, Italia ;Musicò, E.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione Roma2, Roma, Italia ;Povero, G.; Istituto Superiore Mario Boella ;Pini, M.; Istituto Superiore Mario Boella ;Dovis, F.; Politecnico di Torino ;Romero, R.; Politecnico di Torino ;Linty, N.; Politecnico di Torino ;Abadi, P.; National Institute of Aeronautics and Space LAPAN ;Nuraeni, F.; National Institute of Aeronautics and Space LAPAN ;Husin, A.; National Institute of Aeronautics and Space LAPAN ;Le Huy, M.; Institute of Geophysics Vietnam ;Thi Lan, T.; Institute of Geophysics Vietnam ;Vinh La, T.; University of Science and Technology, Hanoi, Vietnam ;Gil Pillat, V.; Universidade do Vale do Paraíba, São José dos Campos, Brazil ;Floury, N.; European Space Agency, Noordwijk, Netherlands; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; We investigate the geospace response to the 2015 St. Patrickˈs Day storm leveraging on instruments spread over Southeast Asia (SEA), covering a wide longitudinal sector of the low-latitude ionosphere. A regional characterization of the storm is provided, identifying the peculiarities of ionospheric irregularity formation. The novelties of this work are the characterization in a broad longitudinal range and the methodology relying on the integration of data acquired by Global Navigation Satellite System (GNSS) receivers, magnetometers, ionosondes, and Swarm satellites. This work is a legacy of the project EquatoRial Ionosphere Characterization in Asia (ERICA). ERICA aimed to capture the features of both crests of the equatorial ionospheric anomaly (EIA) and trough (EIT) by means of a dedicated measurement campaign. The campaign lasted from March to October 2015 and was able to observe the ionospheric variability causing effects on radio systems, GNSS in particular. The multiinstrumental and multiparametric observations of the region enabled an in-depth investigation of the response to the largest geomagnetic storm of the current solar cycle in a region scarcely reported in literature. Our work discusses the comparison between northern and southern crests of the EIA in the SEA region. The observations recorded positive and negative ionospheric storms, spread F conditions, scintillation enhancement and inhibition, and total electron content variability. The ancillary information on the local magnetic field highlights the variety of ionospheric perturbations during the different storm phases. The combined use of ionospheric bottomside, topside, and integrated information points out how the storm affects the F layer altitude and the consequent enhancement/suppression of scintillations.571 881 - PublicationRestrictedIonosphere Monitoring in South East Asia in the ERICA Study(2017)
; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; The ERICA study aims to find out signatures of the interplay between the magnetosphere‐geomagnetic field and the ionosphere that degrade trans‐ionospheric signals such as those transmitted by GNSS satellites. The project activity focuses on the characterization of the ionospheric variability of the Equatorial Ionospheric Anomaly in the South East Asian region through the analysis of datasets collected with an ad hoc measurements campaign. The campaign has been conducted with ground‐based instruments located in the footprints of the Equatorial Ionospheric Anomaly and Equatorial Ionospheric Trough. This paper presents some of the relevant results achieved by the project, in terms of ionospheric climatology and weather assessment over the interested area. In particular, the paper describes the average condition of the Equatorial Ionospheric Anomaly recorded during the entire campaign and provides interesting insights on relevant scintillation events.536 8