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  • 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)
    Artículo
    Acceso restringido por política de la editorial
    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 ...
  • Sibsonian and non-Sibsonian natural neighbour interpolation of the total electron content value 

    Kotulak, Kacper; Fron, Adam; Krankowski, Andrzej; Olivares Pulido, German; Hernández Pajares, Manuel (2017-03)
    Artículo
    Acceso abierto
    In radioastronomy the interferometric measurement between radiotelescopes located relatively close to each other helps removing ionospheric effects. Unfortunately, in case of networks such as LOw Frequency ARray (LOFAR), ...
  • 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, German (2017-03)
    Artículo
    Acceso restringido por política de la editorial
    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 ...
  • 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 (2017-11-28)
    Artículo
    Acceso abierto
    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 ...
  • Temporal and spatial variations of global ionospheric total electron content under various solar conditions 

    Liu, Jingbin; Hernández Pajares, Manuel; Liang, Xinlian; An, Jiachun; Wang, Zemin; Chen, Ruizhi; Sun, Wei; Hyyppä, Juha (2016-12-09)
    Artículo
    Acceso abierto
    By utilizing the numerical technique of principal component analysis (PCA), this work analyses temporal and spatial variations of the ionosphere under various solar conditions during the period 1999–2013. Applying the PCA ...
  • MONITOR Ionospheric Network: two case studies on scintillation and electron content variability 

    Beniguel, Yannick; Cherniak, Iurii; García Rigo, Alberto; Hamel, P.; Hernández Pajares, Manuel; Kameni, Roland; Kashcheyev, Anton; Krankowski, Andrzej; Monnerat, Michel; Nava, Bruno; Ngaya, Herbert; Orús Pérez, Raul; Secretan, Hugues; Serant, Damien; Schlüter, Stefan; Wilken, Volken (2017-03-13)
    Artículo
    Acceso abierto
    The ESA MONITOR network is composed of high-frequency-sampling global navigation satellite systems (GNSS) receivers deployed mainly at low and high latitudes to study ionosphere variability and jointly with global GNSS ...
  • Ionospheric tomography by gradient-enhanced kriging with STEC measurements and ionosonde characteristics 

    Minkwitz, David; van den Boogaart, K. Gerald; Gerzen, Tatjana; Hoque, Mainul; Hernández Pajares, Manuel (2016-11-14)
    Artículo
    Acceso abierto
    The estimation of the ionospheric electron density by kriging is based on the optimization of a parametric measurement covariance model. First, the extension of kriging with slant total electron content (STEC) measurements ...
  • The self organizing map of neighbour stars and its kinematical interpretation 

    Hernández Pajares, Manuel; Cubarsí Morera, Rafael; Monte Moreno, Enrique (1993-02)
    Artículo
    Acceso abierto
    The Self-Organizing Map (SOM) is a neural network algorithm that has the special property ofcreating spatially organized tepresetüatioes of various features of input signals. The resulting maps resemble realneural structures ...
  • Prediction and warning system of SEP events and solar flares for risk estimation in space launch operations 

    García Rigo, Alberto; Nuñez, Marlon; Qahwaji, Rami; Ashamari, Omar W; Jiggens, Piers; Pérez Querol, Gustau; Hernández Pajares, Manuel; Hilgers, Alain (2016-07-08)
    Artículo
    Acceso abierto
    A web-based prototype system for predicting solar energetic particle (SEP) events and solar flares for use by space launch operators is presented. The system has been developed as a result of the European Space Agency (ESA) ...
  • 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)
    Artículo
    Acceso abierto
    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 ...
  • Long-term comparison of the ionospheric F2 layer electron density peak derived from ionosonde data and Formosat-3/COSMIC occultations 

    Limberger, Marco; Hernández Pajares, Manuel; Aragón Àngel, Angela; Altadill, David; Dettmering, Denise (2015-06-15)
    Artículo
    Acceso abierto
    Electron density profiles (EDPs) derived from GNSS radio occultation (RO) measurements provide valuable information on the vertical electron density structure of the ionosphere and, among others, allow the extraction of ...
  • North-south components of the annual asymmetry in the ionosphere 

    Gulyaeva, Tamara L.; Arikan, Feza; Hernández Pajares, Manuel; Veselovsky, I.S. (2014-07-01)
    Artículo
    Acceso abierto
    A retrospective study of the asymmetry in the ionosphere during the solstices is made using the different geospace parameters in the North and South magnetic hemispheres. Data of total electron content (TEC) and global ...

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