Now showing items 1-20 of 70

    • A linear scale height Chapman model supported by GNSS occultation measurements 

      Olivares Pulido, Germán; Hernández Pajares, Manuel; Aragón Ángel, Maria Angeles; García Rigo, Alberto (2016-05)
      Conference lecture
      Open Access
      Global Navigation Satellite Systems (GNSS) radio occultations allow the vertical sounding of the Earth's atmosphere, in particular, the ionosphere. The physical observables estimated with this technique permit to test ...
    • A New way of estimating the spatial and temporal components of the vertical total electron content gradient based on UPC-IonSAT global ionosphere maps 

      Liu, Qi; Hernández Pajares, Manuel; Yang, Heng; Monte Moreno, Enrique; García Rigo, Alberto; Lyu, Haixia; Olivares Pulido, Germán; Orús Pérez, Raul (2022-02)
      Article
      Open Access
      The determination of the ionospheric perturbation degree is essential to describe the ionosphere state for space weather monitoring. A new method for estimating the spatial and temporal components of the Vertical Total ...
    • 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)
      Conference lecture
      Restricted access - publisher's policy
      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
      Open Access
      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 ...
    • 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
      Open Access
      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 ...
    • 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 ...
    • 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
      Open Access
      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 ...
    • Comparing performances of seven different global VTEC ionospheric models in the IGS context 

      Hernández Pajares, Manuel; Roma Dollase, David; Krankowski, Andrzej; García Rigo, Alberto; Orús Pérez, Raul (International GNSS Service (IGS), 2016)
      Conference report
      Restricted access - publisher's policy
      A summary of the main concepts on Global Ionospheric Map(s) (hereinafter GIM(s)) of Vertical Electron Content (VTEC), with special emphasis on their assessment, is presented in this paper. It is based on the experience ...
    • 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)
      Conference lecture
      Restricted access - publisher's policy
    • Consistency of seven different GNSS global ionospheric mapping techniques during one solar cycle 

      Roma Dollase, David; Hernández Pajares, Manuel; Krankowski, Andrzej; Kotulak, Kacper; Ghoddousi Fard, Reza; Yuan, Yunbin; Li, Zishen; Zhang, Hongping; Shi, Chuang; Wang, Cheng; Feltens, Joachim; Vergados, Panagiotis; Komjathy, Attila; Schaer, Stefan C.; García Rigo, Alberto; Gómez Cama, José Mª (2018-06)
      Article
      Open Access
      In the context of the International GNSS Service (IGS), several IGS Ionosphere Associated Analysis Centers have developed different techniques to provide global ionospheric maps (GIMs) of vertical total electron content ...
    • Contributions to ionospheric determination with global positioning system: solar flare detection and prediction of global maps of total electron content 

      García Rigo, Alberto (Universitat Politècnica de Catalunya, 2012-12-17)
      Doctoral thesis
      Open Access
      Two research studies have been addressed in this thesis. Both of them are of actual scientific interest and are based on processing GNSS data. The first part of this thesis is devoted to GNSS detection and monitoring of ...
    • Description of the experiment set-up in Vietnam 

      Quang, Phuong Xuan; Vinh, La The; Juan Zornoza, José Miguel; Sanz Subirana, Jaume; García Rigo, Alberto; Hai Tung, Ta (2013-07-03)
      Research report
      Restricted access - author's decision
    • 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
      Open Access
      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 ...
    • Distribution and mitigation of higher-order ionospheric effects on precise GNSS processing 

      Hernández Pajares, Manuel; Aragón Ángel, María Ángeles; Defraigne, Pascale; Bergeot, Nicolas; Prieto Cerdeira, Roberto; García Rigo, Alberto (2014-04)
      Article
      Open Access
      Higher-order ionospheric effects (I2+) are one of the main limiting factors in very precise Global Navigation Satellite Systems (GNSS) processing, for applications where millimeter accuracy is demanded. This paper summarizes ...
    • Electron density extrapolation above F2 peak by the linear Vary-Chap model supporting new Global Navigation Satellite Systems-LEO occultation missions 

      Hernández Pajares, Manuel; García Fernández, Miquel; Rius Carrasco, Antoni; Notarpietro, Riccardo; von Engeln, Axel; Olivares Pulido, Germán; Aragón Ángel, Maria Angeles; García Rigo, Alberto (2017-08)
      Article
      Open Access
      The new radio-occultation (RO) instrument on board the future EUMETSAT Polar System-Second Generation (EPS-SG) satellites, flying at a height of 820 km, is primarily focusing on neutral atmospheric profiling. It will also ...
    • Experiments on the Ionospheric Models in GNSS 

      Vinh, La The; Quang, Phuong Xuan; García Rigo, Alberto; Rovira Garcia, Adrià; Ibáñez Segura, Deimos (2013)
      Conference report
      Open Access
      In GNSS, one of the main error sources of the Standard Positioning Service (SPS) is introduced by the ionosphere. Although this error can be cancelled by combining two signals at different frequencies, most of the ...
    • Global distribution of ionospheric scintillations from the Real-Time GPS ROTI 

      García Rigo, Alberto; Hernández Pajares, Manuel; Roma-Dollase, David (2018)
      Conference lecture
      Open Access
      A global real-time monitoring system has been implemented in the frame of ESA-ESTEC/EGNOS-POfunded project MONITOR. It is based on world-wide GNSS datastreams distributed by means of NTRIP and provides multiple ionospheric ...
    • Global monitoring of ionospheric weather by GIRO and GNSS data fusion 

      Galkin, Ivan; Fron, Adam; Reinisch, Bodo W.; Hernández Pajares, Manuel; Krankowski, Andrzej; Nava, Bruno; Bilitza, Dieter; Kotulak, Kacper; Flisek, Pawel; Li, Zishen; Wang, Ningbo; Roma Dollase, David; García Rigo, Alberto; Batista, Inez (2022-02-23)
      Article
      Open Access
      Prompt and accurate imaging of the ionosphere is essential to space weather services, given a broad spectrum of applications that rely on ionospherically propagating radio signals. As the 3D spatial extent of the ionosphere ...
    • Global prediction of the vertical total electron content of the ionosphere based on GPS data 

      García Rigo, Alberto; Monte Moreno, Enrique; Hernández Pajares, Manuel; Juan Zornoza, José Miguel; Sanz Subirana, Jaume; Aragón Ángel, María Ángeles; Salazar Hernández, Dagoberto José (2011-12-29)
      Article
      Open Access
      Although vertical total electron content (VTEC) forecasting is still an open subject of research, the use of predictions of the ionospheric state at a scale of several days is an area of increased interest. A global VTEC ...
    • GPS as a solar observational instrument: real-time estimation of EUV photons flux rate during strong, medium, and weak solar flares 

      Singh, Talwinder; Hernández Pajares, Manuel; Monte Moreno, Enrique; García Rigo, Alberto; Olivares Pulido, Germán (2015-12-15)
      Article
      Open Access
      In this manuscript, the authors show how the Global Navigation Satellite Systems, GNSS (exemplified in the Global Positioning System, GPS), can be efficiently used for a very different purpose from that for which it was ...