Exploració per tema "Geofísica"

Ara es mostren els items 21-40 de 172

    • Assessment of edge-based finite element technique for geophysical electromagnetic problems: efficiency, accuracy and reliability 

      Castillo Reyes, Octavio; de la Puente, Josep; Puzyrev, Vladimir; Cela, José M. (International Center for Numerical Methods in Engineering (CIMNE), 2015-04)
      Comunicació de congrés
      Accés obert
      In Finite Element Methods for solving electromagnetic field problems, the use of Edge Elements has become very popular. In fact, Edge Elements are often said to be a cure to many difficulties that are encountered (particularly ...

    • Assessment of lidar inversion errors for homogeneous atmospheres 

      Rocadenbosch Burillo, Francisco; Comerón Tejero, Adolfo; Pineda Masnou, Daniel (OPTICAL SOC AMER, 1998-04-30)
      Article
      Accés obert
      The inversion of lidar returns from homogeneous atmospheres has been done customarily through the well-known slope method. The logarithmic operation over the range-corrected and system-normalized received signal used in ...

    • Assessment of St. Patrick's Day 2015 Geomagnetic storm impact on EGNOS 

      Hernández Pajares, Manuel; Béniguel, Yannick; Orús Pérez, Raul; Prieto Cerdeira, Roberto; García Rigo, Alberto; Kinrade, J; Kauristie, Kirsti; Schlueter, Stefan; Serant, Damien; Krankowski, Andrzej; Secretan, Hugues; Sampedro Casis, Rodrigo; Prats Menéndez, Xavier (European Space Agency (ESA), 2015)
      Comunicació de congrés
      Accés restringit per política de l'editorial
      The Monitor project has been designed to monitor ionospheric events that would allow evaluating its impact on European GNSS Systems. It includes a network of ionospheric scintillation monitoring stations in various ...

    • Assessment of the capabilities and applicability of ionospheric perturbation indices provided in Europe 

      Borries, Claudia; Wilken, Volken; Jacobsen, Knut Stanley; García Rigo, Alberto; Dziak-Jankowska, Beata; Kervalishvili, Guram; Jakowski, Norbert; Tsagouri, Ioanna; Hernández Pajares, Manuel; Ferreira, Arthur A.; Hoque, Mainul (2020-08-01)
      Article
      Accés obert
      Perturbations in the ionosphere are of great interest not only for scientific research, but also for applications using transionospheric radiosignals (e.g. GNSS applications and HF communication), because the transmission ...

    • Assessment of the F2-layer electron density peak inferred from Formosat-3/COSMIC radio occultations over half a Solar Cycle 

      Aragon-Angel, Angela; Limberger, Marco; Hernández Pajares, Manuel; Altadill, David; Dettmering, Denise (2016)
      Text en actes de congrés
      Accés restringit per política de l'editorial
      GNSS radio occultation (RO) measurements have become crucial to provide valuable information on the vertical electron density structure of the Ionosphere. Ionospheric key parameters such as the maximum electron density ...

    • Automated GPS Signal-in-Space anomalies monitoring over more than 11 years 

      Sanz Subirana, Jaume; Juan Zornoza, José Miguel; López de Echazarreta, Carlos; González Casado, Guillermo; Rovira Garcia, Adrià; Alonso Alonso, María Teresa; Ibáñez Segura, Deimos (ION Publications (The Institute of navigation), 2019)
      Text en actes de congrés
      Accés restringit per decisió de l'autor

    • Calibration procedures in 2-D large interferometric radiometers study applied to the MIRAS/SMOS instrument 

      Torres Torres, Francisco; Camps Carmona, Adriano José; Corbella Sanahuja, Ignasi; Bará Temes, Francisco Javier; Vall-Llossera Ferran, Mercedes Magdalena; Duffo Ubeda, Núria (2000)
      Text en actes de congrés
      Accés obert

    • Chaotic advection, transport and patchiness in clouds of pollution in an estuarine flow 

      Stirling, James Robert (American Institute of Mathematical Sciences, 2001)
      Article
      Accés obert
      We present an application of the transport theory developed for area preserving dynamical systems, to the problem of pollution and in particular patchiness in clouds of pollution in partially stratified estuaries. We ...

    • Climatology and modeling of ionospheric irregularities over Greenland based on empirical orthogonal function method 

      Jin, Yaqi; Clausen, Lasse B. N.; Miloch, Wojciech J.; Høeg, Per; Jarmolowski, Wojciech; Wielgosz, Pawel; Paziewski, Jacek; Milanowska, Beata; Hoque, Mainul; Berdermann, Jens; Lyu, Haixia; Hernández Pajares, Manuel; García Rigo, Alberto (EDP Sciences, 2022-05-31)
      Article
      Accés obert
      This paper addresses the long-term climatology (over two solar cycles) of total electron content (TEC) irregularities from a polar cap station (Thule) using the rate of change of the TEC index (ROTI). The climatology reveals ...

    • Coincident observations by the Kharkiv IS radar and ionosonde, DMSP and Arase (ERG) satellites, and FLIP model simulations: implications for the NRLMSISE-00 hydrogen density, plasmasphere, and ionosphere 

      Kotov, Dmytro; Richards, Philip G.; Truhlík, Vladimír; Hernández Pajares, Manuel (2018-08)
      Article
      Accés obert
      This paper reports the results of ionosphere and plasmasphere observations with the Kharkiv incoherent scatter radar and ionosonde, Defense Meteorological Satellite Program, and Arase (ERG) satellites and simulations with ...

    • Combining Swarm Langmuir probe observations, LEO-POD-based and ground-based GNSS receivers and ionosondes for prompt detection of ionospheric earthquake and tsunami signatures: Case study of 2015 Chile-Illapel event 

      Jarmolowski, Wojciech; Belehaki, Anna; Hernández Pajares, Manuel; Schmidt, Michael; Goss, Andreas; Wielgosz, Pawel; Yang, Heng; Krypiak-Gregorczyk, Anna; Tsagouri, Ioanna; Paouris, Evangelos; Monte Moreno, Enrique; García Rigo, Alberto; Milanowska, Beata; Erdogan, Eren; Graffigna, Victoria; Haagmans, Roger (2021-12-08)
      Article
      Accés obert
      The study investigates ionospheric electric field responses to the earthquake (EQ) of magnitude 8.3, and the related seismic activity and tsunami triggered by the mainshock in Chile-Illapel region, at 22:54 UTC, in the ...

    • Comments on: confirming geomagnetic Sfe by means of a solar flare detector based on GNSS 

      Hernández Pajares, Manuel; García Rigo, Alberto (2020-01-01)
      Article
      Accés obert
      We report two comments affecting the paper “Curto JJ, Juan JM & Timoté CC, 2019. Confirming geomagnetic Sfe by means of a solar flare detector based on GNSS. J Space Weather Space Clim 9: A42. https://doi.org/10.1051/sws ...

    • Comparison of GPS analysis strategies for high-accuracy vertical land motion 

      Kierulf, H P; Plag, H P; Bingley, R M; Teferle, N; Demir, C; Cingoz, A; Yildiz, H; Zdunek, R; Jaworski, L; Martínez Benjamín, Juan José; Orús Pérez, Raul; Aragón Ángel, María Ángeles (2008-01)
      Article
      Accés obert
      Tide gauges measure sea level changes relative to land. To separate absolute changes in sea level from vertical land movements tide gauges are often co-located with Continuous GPS (CGPS). In order to achieve an accuracy ...

    • Comprehensive ionospheric delay modelling for single-frequency GNSS precise positioning: first steps 

      Colombo, Oscar L.; Hernández Pajares, Manuel; Janssen, Volker; García Rigo, Alberto (International GNSS Service (IGS), 2016)
      Comunicació de congrés
      Accés restringit per política de l'editorial

    • Comprehensive study on the tropospheric Wet Delay and horizontal gradients during a severe weather event 

      Graffigna, Victoria; Hernández Pajares, Manuel; Azpilicueta, Francisco; Gende, Mauricio (Multidisciplinary Digital Publishing Institute (MDPI), 2022-02-12)
      Article
      Accés obert
      GNSS meteorology is today one of the most growing technologies to monitor severe weather events. In this paper, we present the usage of 160 GPS reference stations over the period of 14 days to monitor and track Hurricane ...

    • Confined rotating convection in water-ethanol mixtures 

      Montmany Majó, Martí (Universitat Politècnica de Catalunya, 2019-10-15)
      Treball Final de Grau
      Accés obert
      Flows driven by temperature gradients in the presence of a gravity field have interest in geophysical flows and in many engineering applications (heat transfer, crystal growth, storage tanks, etc ). Special attention ...

    • Continuous time-varying kriging for spatial prediction of functional data: An environmental application 

      Giraldo, Ramón; Delicado Useros, Pedro Francisco; Mateu, Jorge (2008-07-07)
      Article
      Accés obert
      Spatially correlated functional data is present in a wide range of environmental disciplines and, in this context, efficient prediction of curves is a key issue. We present an approach for spatial prediction based on the ...

    • Critical issues in ionospheric data quality and implications for scientific studies 

      Araujo-Pradere, E.; Weatherhead, E. C.; Dandenault, P. B.; Bilitza, D.; Wilkinson, P.; Hernández Pajares, Manuel (2019-05)
      Article
      Accés obert
      Ionospheric data are valuable records of the behavior of the ionosphere, solar activity, and the entire Sun-Earth system. The data are critical for both societally important services and scientific investigations of upper ...

    • Data gathering and methodology 

      Sanz Subirana, Jaume; Juan Zornoza, José Miguel (2018-10-31)
      Report de recerca
      Accés obert
      The aim of this WP5 is to specify the impact of TID in EGNOS, N-RTK and HF systems through statistical correlation of the performance data recorded from system operators and of TID detection results. The analysis will be ...

    • Direct MSTID mitigation in precise GPS processing 

      Hernández Pajares, Manuel; Wielgosz, Pawel; Paziewski, Jacek; Krypiak-Gregorczyk, Anna; Krukowska, Marta; Stepniak, Katarzyna; Kaplon, Jan; Hadas, Tomasz; Sosnica, Krzysztof; Bosy, Jaroslaw; Orús Pérez, Raul; Monte Moreno, Enrique; Yang, Heng; García Rigo, Alberto; Olivares Pulido, Germán (2017-03)
      Article
      Accés obert
      In this paper, the authors summarize a simple and efficient approach developed to mitigate the problem in precise GNSS positioning originated by the most frequent ionospheric wave signatures: the Medium Scale Travelling ...