Now showing items 1-20 of 25

    • 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 ...
    • ADDTID: An alternative tool for studying earthquake/tsunami signatures in the ionosphere. Case of the 2011 Tohoku earthquake 

      Yang, Heng; Monte Moreno, Enrique; Hernández Pajares, Manuel (Multidisciplinary Digital Publishing Institute (MDPI), 2019-09-13)
      Article
      Open Access
      Traveling Ionospheric Disturbances (ADDTID) algorithm. This algorithm automatically detects and characterizes Traveling Ionospheric Disturbances (TIDs) from Global Navigation Satellite System (GNSS) measurements. Applying ...
    • Assessment of centre national d'Études spatiales real-time ionosphere maps in instantaneous precise real-time kinematic positioning over medium and long baselines 

      Tomaszewski, Dariusz; Wielgosz, Pawel; Rapinski, Jacek; Krypiak-Gregorczyk, Anna; Kazmierczak, Rafal; Hernández Pajares, Manuel; Yang, Heng; Orús Pérez, Raul (Multidisciplinary Digital Publishing Institute (MDPI), 2020-04-17)
      Article
      Open Access
      Precise real-time kinematic (RTK) Global Navigation Satellite System (GNSS) positioning requires fixing integer ambiguities after a short initialization time. Originally, it was assumed that it was only possible at a ...
    • 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 ...
    • Detection and description of the different ionospheric disturbances that appeared during the solar eclipse of 21 August 2017 

      Yang, Heng; Monte Moreno, Enrique; Hernández Pajares, Manuel (Multidisciplinary Digital Publishing Institute (MDPI), 2018-10-30)
      Article
      Open Access
      This work will provide a detailed characterization of the travelling ionospheric disturbances (TIDs) created by the solar eclipse of 21 August 2017, the shadow of which crossed the United States from the Pacific to the ...
    • 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 ...
    • Estimation of polar depletion regions by VTEC contrast and watershed enhancing 

      Monte Moreno, Enrique; Hernández Pajares, Manuel; Lyu, Haixia; Yang, Heng; Aragon-Angel, Angela (Institute of Electrical and Electronics Engineers (IEEE), 2022)
      Article
      Open Access
      This article presents a method for determining near-Pole ionization depletion regions and troughs from global navigation satellite system (GNSS) vertical total electron content (VTEC) maps. To define the regions, we use ...
    • Forecast of the global TEC by nearest neighbour technique 

      Monte Moreno, Enrique; Yang, Heng; Hernández Pajares, Manuel (Multidisciplinary Digital Publishing Institute (MDPI), 2022-03-11)
      Article
      Open Access
      We propose a method for Global Ionospheric Maps of Total Electron Content forecasting using the Nearest Neighbour method. The assumption is that in a database of global ionosphere maps spanning more than two solar cycles, ...
    • GNSS solar astronomy in real-time during more than one solar cycle 

      Hernández Pajares, Manuel; García Rigo, Alberto; Monte Moreno, Enrique; Liu, Qi; Roma Dollase, David; Yang, Heng; Beniguel, Yannick; Moreno Borrás, David; Fors Aldrich, Octavi; Lyu, Haixia; Orús Pérez, Raul; Ventura Traveset, Javier (Elsevier, 2023-12-09)
      Article
      Open Access
      This work presents a summary of the continuous non-stop (hereinafter 24/7) real-time measurement and warning system for EUV solar activity, which is based on worldwide multifrequency Global Navigation Satellite Systems ...
    • IGS real-time service for global ionospheric total electron content modeling 

      Li, Zishen; Wang, Ningbo; Hernández Pajares, Manuel; Yuan, Yunbin; Krankowski, Andrzej; Liu, Ang; Zha, Jiuping; García Rigo, Alberto; Roma Dollase, David; Yang, Heng (2020-02-18)
      Article
      Restricted access - publisher's policy
      Benefiting from global multi-frequency and multi-constellation GNSS measurements provided by the experimental International GNSS real-time service (IGS RTS), a predicting-plus-modeling approach employed by Chinese Academy ...
    • Improved MSTID modelling and impact on precise GNSS processing 

      Hernández Pajares, Manuel; Wielgosz, Pawel; Paziewski, Jacek; Krypiak-Gregorczyk, Anna; Stepniak, Katarzyna; Bosy, Jaroslaw; Kaplon, Jan; Hadas, Tomasz; Orús Pérez, Raul; Monte Moreno, Enrique; Yang, Heng; Olivares Pulido, Germán; García Rigo, Alberto (2015)
      Conference lecture
      Restricted access - publisher's policy
    • Internal report. Numerical methods for medium scale traveling ionospheric disturbances signal pre-processing 

      Yang, Heng; Monte Moreno, Enrique; Hernández Pajares, Manuel (2015-01-15)
      Research report
      Open Access
      In this paper we discuss the e ects of several signal preprocessing methods for enhancing the Medium Scale Traveling Ionospheric Dis- turbances (MSTIDs) signal. The MSTIDs signal are the ionospheric signatures of waves ...
    • Internal report. Solving mixed integer non-linear programming problem applied to GNSS data 

      Yang, Heng; Monte Moreno, Enrique; Hernández Pajares, Manuel (2014-11-07)
      Research report
      Open Access
      The purpose of this paper is to characterize Medium Scale Trav- eling Ionospheric Disturbances (MSTIDs), by means of Mixed Integer Nonlinear Programming (MINLP). The MINLP techniques are used to for estimating the ...
    • Internal report. Spectral methods for time delay estimation of MSTIDs signal 

      Yang, Heng; Monte Moreno, Enrique; Hernández Pajares, Manuel (2015-02-14)
      Research report
      Open Access
      The primary goal of this work is to summarize spectral meth- ods to estimate the time delay variations of the detrended Medium Scale Traveling Ionospheric Disturbances (MSTIDs) signals and pre- liminarily discuss the ...
    • Interpretación de un experimento de transporte de solutos con reacciones bimoleculares irreversibles utilizando un modelo de transferencia de masa 

      Yang, Heng (Universitat Politècnica de Catalunya, 2015-05)
      Master thesis
      Restricted access - author's decision
      El transporte de soluto reactivo en medio poroso es caracterizado por una combinación de procesos físico - químicos. Esto ocurre en una multiplicidad de escalas espaciotemporales que deben ...
    • Ionospheric response to the 2020 Samos earthquake and tsunami 

      Alfonsi, Lucilla; Cesaroni, Claudio; Hernández Pajares, Manuel; Astafyeva, Elvira; Bufféral, Simon; Elias, Panagiotis; Belehaki, Anna; Ioanna, Tsagouri; Yang, Heng; Guerra, Marco (Springer, 2024-01-19)
      Article
      Open Access
      On 30 October 2020 at 11:51 UT, a magnitude 7.0 earthquake occurred in the Dodecanese sea (37.84°N, 26.81°E, 10 km depth) and generated a tsunami with an observed run-up of more than 1 m on the Turkish coasts. Both the ...
    • Ionospheric storm scale index based on high time resolution UPC-IonSAT global ionospheric maps (IsUG) 

      Liu, Qi; Hernández Pajares, Manuel; Lyu, Haixia; Nishioka, Michi; Yang, Heng; Monte Moreno, Enrique; Gulyaeva, Tamara L.; Beniguel, Yannick; Wilken, Volker; Olivares Pulido, Germán; Orús Pérez, Raul (2021-11)
      Article
      Open Access
      The ionospheric storms have adverse effects on the radio communications, satellite communications and also the Global Navigation Satellite Systems (GNSS) application. A new Ionospheric storm Scale from Universitat Politècnica ...
    • Method for forecasting ionospheric electron content fluctuations based on the optical flow algorithm 

      Monte Moreno, Enrique; Hernández Pajares, Manuel; Yang, Heng; García Rigo, Alberto; Jin, Yaqi; Høeg, Per; Miloch, Wojciech J.; Wielgosz, Pawel; Jarmolowski, Wojciech; Paziewski, Jacek; Milanowska, Beata; Hoque, Mainul; Orús Pérez, Raul (2022-01-01)
      Article
      Open Access
      We present the optical flow algorithm for forecasting the rate of total electron content index (OFROTI). It consists of a method for predicting maps of rapid fluctuations of ionospheric electron content in terms of global ...
    • Multi-TID detection and characterization in a dense Global Navigation Satellite System receiver network 

      Yang, Heng; Monte Moreno, Enrique; Hernández Pajares, Manuel (2017-09-01)
      Article
      Open Access
      The medium-scale traveling ionospheric disturbances (MSTIDs) constitute the most frequent ionospheric wave signatures. We propose a method for detecting the number of simultaneous MSTIDs from a time series of high-pass-filtered ...
    • On the detection of ionospheric waves, relationship with earthquakes and tsunamis 

      Yang, Heng (Universitat Politècnica de Catalunya, 2019-06-11)
      Doctoral thesis
      Open Access
      The research of this thesis addresses the detection and characterization of ionospheric waves and its application to traveling ionospheric disturbances (TIDs) induced by the natural events, such as earthquakes and tsunamis. ...