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    • An example of operation for a partly manned Antarctic geomagnetic observatory and the development of a radio link for data transmission 

      Torta Margalef, Joan Miquel; Marsal Vinadé, Santiago; Riddick, John C.; Vilella Parra, Carles; Altadill Felip, David; Blanch Llosa, Estefania; Cid, Oscar; Curto, Joan J.; De Santis, Angelo; Gaya-Piqué, Luis R.; Mauricio Ferré, Juan; Pijoan Vidal, Joan Lluís; Solé, Germán J.; Ugalde, Arantza (Annals of Geophysics, 2009. Vol. 52, 1 (Febrer), 2009-02)
      The experience acquired from more than ten years of operation of an Antarctic geomagnetic observatory is described along with the development of data transmission facilities. The observatory was deployed ...

    • Vertical and oblique ionospheric soundings over a very long multihop HF radio link from polar to midlatitudes: Results and relationships 

      Vilella Parra, Carles; Miralles Esteban, David; Fonseca, David; Acosta Pérez, Francisco; Solé, J.G.; Torta Margalef, Joan Miquel (Radio Science, 2009. Vol. 44, Rs2014, 2009-04)
      A vertical incidence sounder (VIS) was installed at the Spanish Antarctic Base (62.7°S, 299.6°E) during the Antarctic summer survey 2004–2005. In addition, an oblique sounding (OS) system for HF ...

    • A new approach to the hourly mean computation problem when dealing with missing data 

      Marsal Vinadé, Santiago; Curto, J. J. (Earth Planet Sp (2009) 61: 945, 2009-10-19)
      Geomagnetic observatory records are unavoidably affected by primary data interruptions which, in turn, may have possible effects on the accuracy of the definitive data derived from them. One of the ...

    • Geomagnetically induced currents in a power grid of northeastern Spain 

      Torta, Joan Miquel; Serrano, Lluís; Regué, Joan Ramon; Sánchez, Albert Miquel; Roldán, Elionor (Space Weather, 10, S06002, 2012-06-07)
      Using the geomagnetic records of Ebro geomagnetic observatory and taking the plane wave assumption for the external current source and a homogeneous Earth conductivity, a prediction of the effects of ...

    • Midlatitude F region peak height changes in response to interplanetary magnetic field conditions and modeling results 

      Blanch Llosa, Estefania; Altadill, David (Blanch, E., and D. Altadill (2012), Midlatitude F region peak height changes in response to interplanetary magnetic field conditions and modeling results, J. Geophys. Res., 117, A12311, doi:10.1029/2012JA018009., 2012-12-13)
      The response of the electron density peak height of the F2 region, hmF2, to geomagnetic storms has been investigated and a characteristic behavior of the peak height disturbance in relation to local-time, ...

    • Automatic detection of sudden commencements using neural networks 

      Segarra, Antoni; Curto, Juan José (Earth, Planets and Space, volum 65, pàg. 791-797, 2013-08-23)
      The aim of this work is to develop an automatic system to detect sudden commencements (SCs). SCs are produced by a sudden increase of solar wind dynamic pressure and are detected simultaneously everywhere ...

    • Multipoint observation of the response of the magnetosphere and ionosphere related to the sudden impulse event on 19 November 2007 

      Segarra, Antoni; Nosé, Masahito; Curto, Juan José; Arak, Tohru (Journal of Space Weather Space Climate, 5, A13, 2015-05-18)
      The aim of this study is to provide a complete scope of a magnetic sudden impulse (SI) event along its way through interplanetary space and the magnetosphere until its arrival to the ground. In our case, ...

    • Vertical and Oblique ionospheric soundings over the long haul HF link between Antarctica and Spain 

      Ads, Ahmed Gamal; Bergada, Pau; Regué, Joan Ramon; Alsina-Pagès, Rosa Ma; Pijoan, Joan Lluis; Altadill Felip, David; Badia Folguera, David; Graells Castellà, Simó (Radio Science. 2015, Vol. 50, No.9 (Setembre), 2015-09)
      This paper presents a comparative study between the oblique sounding results, theInternational Telecommunication Union Rec533 HF prediction model, and the vertical sounding results of atransequatorial ...

    • Narrowband and Wideband Channel Sounding of an Antarctica to Spain Ionospheric Radio Link 

      Hervás, Marcos; Alsina-Pagès, Rosa Ma; Orga, Ferran; Altadill Felip, David; Pijoan, Joan Lluis; Badia, David (Remote Sensing. 2015, Vol.7, 2015-09)
      La Salle and Ebro Observatory have been involved in remote sensing projects in Antarctica for the last 11 years (approximately one solar cycle). The Ebro Observatory has been monitoring and analyzing ...

    • Conductivities consistent with Birkeland currents in the AMPERE-driven TIE-GCM 

      Marsal Vinadé, Santiago (Marsal,S.(2015),Conductivities consistent with Birkeland currents in the AMPERE-driven TIE-GCM, J. Geophys. Res. Space Physics, 120, 8045–8065, doi:10.1002/ 2015JA021385., 2015-09-26)
      The Active Magnetosphere and Planetary Electrodynamics Response Experiment (AMPERE) satellite mission has offered for the first time global snapshots of the geomagnetic field-aligned currents with ...

    • Physical Layer Definition for a Long-Haul HF Antarctica to Spain Radio Link 

      Alsina-Pagès, Rosa Ma; Hervás, Marcos; Orga, Ferran; Pijoan, Joan Lluis; Badia, David; Altadill Felip, David (Remote Sensing. 2016. Vol.8 No.5 (Maig), 2016-05)
      La Salle and the Observatori de l’Ebre (OE) have been involved in a remote sensing project in Antarctica for the last 11 years. The OE has been monitoring the geomagnetic activity for more than twenty ...

    • The Solar Rotation in the 1930s from the Sunspot and Flocculi Catalogs of the Ebro Observatory 

      de Paula Vila, Víctor; Curto, Juan José; Casas, Ricard (Solar Phys (2016) 291:2269–2279, 2016-09-06)
      The tables of sunspot and flocculi heliographic positions included in the catalogs published by the Ebro Observatory in the 1930s have recently been recovered and converted into digital format by using ...

    • Use of spherical elementary currents to map the polar current systems associated with the geomagnetic sudden commencements on 2013 and 2015 St. Patrick’s Day storms 

      Marsal, Santiago; Torta, Joan Miquel; Segarra, Antoni; Araki, Tohru (Journal of Geophysical Research: Space Physics, 112, 194-211, 2017-01-13)
      Araki’s model of geomagnetic sudden commencements (SCs) establishes that the ground magnetic signatures globally observed after the onset produced by an increased solar wind dynamic pressure impacting ...

    • Vertical and oblique ionospheric soundings performance comparison over the 12,760 km transequatorial HF link between Antarctica and Spain 

      Alsina-Pagès, Rosa Ma; Hervás, Marcos; Altadill Felip, David; Calduch Casas, Jordi; Blanch Llosa, Estefania (Radio Science. 2017. Vol.52, No.4 (Abril), 2017-03)
      This paper presents the second part of the study of the oblique sounding of a 12,760 km transequatorial ionospheric link between Livingston Island (Antarctica) and Cambrils in Spain. The study consists ...

    • Improving the modeling of geomagnetically induced currents in Spain 

      Torta, Joan Miquel; Marcuello, Alejandro; Campanyà, Joan; Marsal, Santiago; Queralt, Pilar; Ledo, Juanjo (2017-04-19)
      Vulnerability assessments of the risk posed by geomagnetically induced currents (GICs) to power transmission grids benefit from accurate knowledge of the geomagnetic field variations at each node of ...

    • Pilot Ionosonde Network for Identification of Traveling Ionospheric Disturbances 

      Reinisch, Bodo W.; Galkin, Ivan; Belehaki, Anna; Paznukhov, Vadym; Huang, Xueqin; Altadill Felip, David; Buresova, Dalia; Mielich, Jens; Verhulst, Tobias G. W.; Stankov, Stanimir; Blanch, Estefania; Kouba, Daniel; Hamel, Ryan; Kozlov, Alexander; Tsagouri, Ioanna; Mouzakis, Angelos; Messerotti, Mauro; Parkinson, Murray; Ishii, Mamoru (Radio Science, 53, 365–378., 2018-03-30)
      Traveling ionospheric disturbances (TIDs) are the ionospheric signatures of atmospheric gravity waves. Their identification and tracking is important because the TIDs affect all services that rely on ...

    • Improved characterization and modeling of equatorial plasma depletions 

      Blanch, Estefania; Altadill Felip, David; Juan, José Miguel; Camps, Adriano; Basbosa, José; González-Casado, Guillermo; Riba, Jaume; Sanz, Jaume; Vazquez, Gregori; Orús-Pérez, Raúl (J. Space Weather Space Clim. 2018, 8, A38, 2018-08-22)
      This manuscript presents a method to identify the occurrence of Equatorial Plasma Bubbles (EPBs) with data gathered from receivers of Global Navigation Satellite System (GNSS). This method adapts a ...

    • Temporal variation and asymmetry of sunspot and solar plage types from 1930 to 1936 

      Seguí, Aleix; Curto, Juan José; de Paula Vila, Víctor; Rodríguez Gasén, Rosa; Vaquero, José Manuel (Advances in Space Research, 63, 11, 2019-02-23)
      Using the recently converted to digital format heliophysics catalogues of the Ebro Observatory published in the 1930s, we analyse simultaneously the temporal variation and asymmetry of two different ...

    • Quantifying the Performance of Geomagnetically Induced Current Models 

      Marsal, Santiago; Torta, Joan Miquel (Space Weather, 17, 941–949, 2019-07-24)
      We describe a metric that has been repeatedly applied to assess the performance of models aimed at predicting geomagnetically induced currents from Space Weather events. The used parameterization, ...

    • Modelling by Spherical Cap Harmonic Analysis: A Literature Review 

      Torta, Joan Miquel (Surveys in Geophysics, Volume 41, pages 201–247, (2020), 2019-11-06)
      There is the need for robust alternatives to the widely used spherical harmonic analysis when measurements are restricted to a region, or when high spatial frequency fields with much less parameters ...