Browsing by Author "Graffigna, Victoria"Més informacióMés informació

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    • Assessment of GRAS ionospheric measurements for ionospheric model assimilation 

      Mainul Hoque, Mohammed; Prol, Fabricio dos Santos; Hernández Pajares, Manuel; Notarpietro, Riccardo; Yuan, Liangliang; Olivares Pulido, Germán; Graffigna, Victoria; von Engeln, Axel; Marquardt, Christian (Multidisciplinary Digital Publishing Institute (MDPI), 2023-06-15)
      Article
      Open Access
      We conducted a study to assess the GNSS (Global Navigation Satellite System) Receiver for Atmospheric Sounding (GRAS) ionospheric data quality by processing Radio Occultation (RO) observations of ionospheric products. The ...

    • 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
      Open Access
      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 ...

    • 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
      Open Access
      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 ...

    • Interpretation of the tropospheric gradients estimated with GPS during hurricane Harvey 

      Graffigna, Victoria; Hernández Pajares, Manuel; Gende, Mauricio; Azpilicueta, Francisco; Antico, Pablo (2019-01-01)
      Article
      Open Access
      During the last decade Global Positioning System (GPS) Continuous Operating Reference Stations networks have become a new important data source for meteorology. This has dramatically improved the ability to remotely sense ...

    • Ionospheric tomographic common clock model of undifferenced uncombined GNSS measurements 

      Olivares Pulido, Germán; Hernández Pajares, Manuel; Lyu, Haixia; Gu, Shengfeng; García Rigo, Alberto; Graffigna, Victoria; Tomaszewski, Dariusz; Wielgosz, Pawel; Rapinski, Jacek; Krypiak-Gregorczyk, Anna; Kazmierczak, Rafal; Orús Pérez, Raul (2021-10-13)
      Article
      Open Access
      In this manuscript, we introduce the Ionospheric Tomographic Common Clock (ITCC) model of undifferenced uncombined GNSS measurements. It is intended for improving the Wide Area precise positioning in a consistent and simple ...

    • Real-time tomographic inversion of truncated ionospheric GNSS radio occultations 

      Olivares Pulido, Germán; Hernández Pajares, Manuel; Monte Moreno, Enrique; Lyu, Haixia; Graffigna, Victoria; Cardellach Galí, Estel; Mainul Hoque, Mohammed; Prol, Fabricio dos Santos; Notarpietro, Riccardo; García Fernández, Miquel (Multidisciplinary Digital Publishing Institute (MDPI), 2023-06-19)
      Article
      Open Access
      This paper presents a new way of combining Abel inversion and the Chapman model with a linearly increasing scale height to retrieve ionospheric electron density vertical profiles from truncated-sounding radio-occultation ...

    • Retrieving geophysical signals from GPS in the La Plata River region 

      Graffigna, Victoria; Brunini, Claudio; Gende, Mauricio; Hernández Pajares, Manuel; Galván, Romina de los Ángeles; Oreiro, Fernando (2019-06-08)
      Article
      Restricted access - publisher's policy
      Over the last few years, efforts to model short-term deformations of the Earth’s crust have multiplied. Sudden water level rise can cause sporadic, but significant, motions in the solid Earth’s surface. In this work, we ...

    • Systematic detection of anomalous ionospheric perturbations above LEOs from GNSS POD Data including possible tsunami signatures 

      Yang, Heng; Hernández Pajares, Manuel; Jarmolowski, Wojciech; Wielgosz, Pawel; Vadas, Sharon L.; Colombo, Oscar L.; Monte Moreno, Enrique; García Rigo, Alberto; Graffigna, Victoria; Krypiak-Gregorczyk, Anna; Milanowska, Beata; Bofill Soliguer, Pablo; Olivares Pulido, Germán; Liu, Qi; Haagmans, Roger (Institute of Electrical and Electronics Engineers (IEEE), 2022-06-13)
      Article
      Open Access
      In this article, we show the capability of a global navigation satellite system (GNSS) precise orbit determination (POD) low Earth orbit (LEO) data to detect anomalous ionospheric disturbances in the spectral range of the ...

    • The correlation between ionospheric electron density variations derived from swarm satellite observations and seismic activity at the Australian–Pacific tectonic plate boundary 

      Jarmolowski, Wojciech; Wielgosz, Pawel; Hernández Pajares, Manuel; Heng, Yang; Milanowska, Beata; Krypiak-Gregorczyk, Anna; Monte Moreno, Enrique; García Rigo, Alberto; Graffigna, Victoria; Haagmans, Roger (Multidisciplinary Digital Publishing Institute (MDPI), 2023-11-29)
      Article
      Open Access
      Swarm electron density (Ne) observations from the Langmuir probe (LP) can detect ionospheric disturbances at the altitude of a satellite. Along-track satellite observations provide a large number of very short observations ...

    • Topside ionospheric tomography exclusively based on LEO POD GPS carrier phases: application to autonomous LEO DCB estimation 

      Hernández Pajares, Manuel; Olivares Pulido, Germán; Hoque, Mainul; Prol, Fabricio dos Santos; Yuan, Liangliang; Notarpietro, Riccardo; Graffigna, Victoria (Multidisciplinary Digital Publishing Institute (MDPI), 2023-01-08)
      Article
      Open Access
      This paper presents a novel technique to estimate DCBs from GPS transmitters and receivers on-board Low Earth Orbit (LEO) satellites. The technique consists of obtaining the DCBs as residuals from the difference between ...

    • Validation of global ionospheric models using long-term observations of pulsar Faraday rotation with the LOFAR radio telescope 

      Porayko, Nataliya; Mevius, Maaijke; Hernández Pajares, Manuel; Tiburzi, Caterina; Olivares Pulido, Germán; Liu, Qi; Verbiest, Joris; Künsemöller, Jörn; Krishnakumar, Moochickal Ambalappat; Bak Nielsen, Ann Sofie; Brüggen, Marcus; Graffigna, Victoria; Dettmar, Ralf Jürgen; Kramer, Michael (Springer Nature, 2023-12-13)
      Article
      Open Access
      Broad band pulsar radiation can be effectively used to monitor the properties of the magneto-ionic media through which it propagates. Faraday rotation calculated from polarised pulsar observations provides an integrated ...

    • Validation of real-time zenith tropospheric delay estimation with TOMION software within WAGNSS networks 

      Graffigna, Victoria (Universitat Politècnica de Catalunya, 2017-02-15)
      Master thesis
      Open Access
      The TOmographic Model of the IONospheric electron content (TOMION) software implements a simultaneous precise geodetic and ionospheric modeling, which can be used to test new approaches for real-time precise GNSS modeling ...