Enviaments recents

  • The self organizing map of neighbour stars and its kinematical interpretation 

    Hernández Pajares, Manuel; Cubarsí Morera, Rafael; Monte Moreno, Enrique (1993-02)
    Article
    Accés obert
    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)
    Article
    Accés obert
    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)
    Article
    Accés restringit per política de l'editorial
    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)
    Article
    Accés obert
    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)
    Article
    Accés obert
    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 ...
  • 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
    Accés obert
    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 ...
  • GIM-TEC adaptive ionospheric weather assessment and forecast system 

    Gulyaeva, Tamara L.; Arikan, Feza; Hernández Pajares, Manuel; Stanislawska, Iwona (2013-09)
    Article
    Accés obert
    The Ionospheric Weather Assessment and Forecast (IWAF) system is a computer software package designed to assess and predict the world-wide representation of 3-D electron density profiles from the Global Ionospheric Maps ...
  • The 2013 Ibiza calibration campaign of Jason-2 and Saral altimeters 

    Frappart, Frédéric; Roussel, Nicolas; Biancale, Richard; Martínez Benjamín, Juan José; Mercier, Flavien; Pérosanz, Felix; Gárate Pasquín, Jorge; Martin Davila, José; Pérez Gómez, Begoña; Gracia Gómez, Carlos; López Bravo, Rogelio; Tapia Gómez, Ana M.; Gili Ripoll, José Antonio; Hernández Pajares, Manuel; Salazar, Mario; Bonnefond, Pascal; Valles Casanova, I. Berenguer (2015-02-09)
    Article
    Accés restringit per política de l'editorial
    This study presents the results of the 2013 Ibiza (Western Mediterranean) calibration campaign of Jason-2 and SARAL altimeters. It took place from 14 to 16 September 2013 and was composed of two phases: the calibration of ...
  • SHPTS: towards a new method for generating precise global ionospheric TEC map based on spherical harmonic and generalized trigonometric series functions 

    Li, Zishen; Yuan, Yunbin; Wang, Ningbo; Hernández Pajares, Manuel; Huo, Xingliang (2015-04)
    Article
    Accés restringit per política de l'editorial
    To take maximum advantage of the increasing Global Navigation Satellite Systems (GNSS) data to improve the accuracy and resolution of global ionospheric TEC map (GIM), an approach, named Spherical Harmonic plus generalized ...
  • Use of GNSS derived ionospheric information to detect and measure Solar Flares 

    Hernández Pajares, Manuel; García Rigo, Alberto; Aragón Ángel, María Ángeles (Universidad Complutense de Madrid (UCM), 2014-12)
    Article
    Accés obert
    The Ionosphere, the partially ionized atmospheric r egion ranging from approximately 60 to +1000 km height, is typically affected by spatial and tempor al variations, driven by Local Time (solar illumina - tion), Latitude ...

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