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Blanch, Estefania
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Blanch, Estefania
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- PublicationOpen AccessAn example of operation for a partly manned Antarctic geomagnetic observatory and the development of a radio link for data transmission(2009-02)
; ; ; ; ; ; ; ; ; ; ; ; ; ; ;Torta, J. M.; Observatori de l’Ebre, CSIC - Universitat Ramon Llull, Roquetes, Spain ;Marsal, S.; Observatori de l’Ebre, CSIC - Universitat Ramon Llull, Roquetes, Spain ;Riddick, J. C.; Observatori de l’Ebre, CSIC - Universitat Ramon Llull, Roquetes, Spain ;Vilella, C.; Enginyeria i Arquitectura La Salle, Universitat Ramon Llull, Barcelona, Spain ;Altadill, D.; Observatori de l’Ebre, CSIC - Universitat Ramon Llull, Roquetes, Spain ;Blanch, E.; Observatori de l’Ebre, CSIC - Universitat Ramon Llull, Roquetes, Spain ;Cid, O.; Observatori de l’Ebre, CSIC - Universitat Ramon Llull, Roquetes, Spain ;Curto, J. J.; Observatori de l’Ebre, CSIC - Universitat Ramon Llull, Roquetes, Spain ;De Santis, A.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione Roma2, Roma, Italia ;Gaya-Piqué, L. R.; Equipe de Géomagnétisme, Institut de Physique du Globe de Paris-CNRS, Paris, France ;Mauricio, J.; Enginyeria i Arquitectura La Salle, Universitat Ramon Llull, Barcelona, Spain ;Pijoan, J. L.; Enginyeria i Arquitectura La Salle, Universitat Ramon Llull, Barcelona, Spain ;Solé, J. G.; Observatori de l’Ebre, CSIC - Universitat Ramon Llull, Roquetes, Spain ;Ugalde, A.; Observatori de l’Ebre, CSIC - Universitat Ramon Llull, Roquetes, Spain; ; ; ; ; ; ; ; ; ; ; ; ; 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 at the Spanish Antarctic Station in 1996. The main instrument was an Overhauser magnetometer deployed in dual axis Helmholtz coils, a δD/δI configuration. The site is only manned during the summer, with the magnetometer left recording throughout the rest of the year. During the 2007-2008 survey the observatory instrumentation has been upgraded with a DMI suspended triaxial fluxgate magnetometer, new sampling hardware and data logging software. Both sampling and timing are carried out under the control of a PIC based microcontroller and GPS receiver. Data presentation, transmission and archiving are performed under the control of a low power embedded PC. For real time access to the data two options have been provided and rigorously tested during the last 10 years: METEOSAT and GOES Data Collection Systems, and recently, a high frequency (HF) digital radio-link, using ionospheric propagation between Antarctica and Spain, has been developed. This latest transmission system is being continuously upgraded, and it would be possible to extend its application to other remote stations. Measurements have been made during the last four years in order to determine the channel characteristics and its variability, mainly the multipath and Doppler spread and the link availability for a given SNR in the receiver. These measurements are being used to design the physical layer of a radiomodem intended to maximize the link capacity keeping the emitted power low.314 512 - PublicationOpen AccessOblique Ionograms Automatic Scaling Algorithm OIASA application to the ionograms recorded by Ebro observatory ionosondeThe oblique ionograms automatic scaling algorithm (OIASA), developed at the INGV for the identification of trace of oblique ionograms, allows the determination of the maximum usable frequency (MUF) for communication between the transmitter and receiver, automatically rejecting poor quality ionograms. A test of the algorithm using data from a campaign of oblique soundings between Dourbes (50.1°N, 4.6°E) and Roquetes (40.8°N, 0.5°E) has been performed. Oblique soundings from three different campaigns have been studied, covering different geomagnetic conditions, in order to study the behavior of the autoscaling algorithm under quiet and perturbed geomagnetic periods. The reported results demonstrate that OIASA performance is not influenced by geomagnetic or ionospheric activity conditions. This demonstrates a satisfactory performance of the automatic scaling algorithm, even under different geomagnetic conditions, the potential application of OIASA as a near-real-time tool for ionospheric monitoring purposes, and its performance for tracking ionospheric effects caused by space weather events.
176 140 - PublicationOpen AccessSolar activity impact on the Earth’s upper atmosphere(2013-12)
; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ;Kutiev, I.; National Institute of Geophysics, Geodesy and Geography, Bulgarian Academy of Sciences, 1113 Sofia, Bulgaria ;Tsagouri, I.; Institute for Space Applications and Remote Sensing, National Observatory of Athens, 15236 Mount Penteli, Greece ;Perrone, L.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione Roma2, Roma, Italia ;Pancheva, D.; National Institute of Geophysics, Geodesy and Geography, Bulgarian Academy of Sciences, 1113 Sofia, Bulgaria ;Mukhtarov, P.; National Institute of Geophysics, Geodesy and Geography, Bulgarian Academy of Sciences, 1113 Sofia, Bulgaria ;Mikhailov, A.; Institute of Terrestrial Magnetism, Ionosphere, and Radio Propagation, Russian Academy of Sciences, 142190 Troitsk, Moskovskaya obl., Russia 5 Institute of Atmospheric Physics ASCR, 14131 Prague, Czech Republic 6 Institute of Communications and Navigation, German Aerospace Center, 51147 Cologne, Germany 7 Ebro Observatory, University Ramon Llull, CSIC, E-43520 Roquetes, Spain 8 Dipartimento di Fisica, Universita` degli Studi di Roma, 00185 Rome, Italy 9 Atmospheric Sounding Station ;Lastovicka, J.; Institute of Atmospheric Physics ASCR, 14131 Prague, Czech Republic ;Jakowski, N.; Institute of Communications and Navigation, German Aerospace Center, 51147 Cologne, Germany ;Buresova, D.; Institute of Atmospheric Physics ASCR, 14131 Prague, Czech Republic ;Blanch, E.; Ebro Observatory, University Ramon Llull, CSIC, E-43520 Roquetes, Spain ;Andonov, B.; National Institute of Geophysics, Geodesy and Geography, Bulgarian Academy of Sciences, 1113 Sofia, Bulgaria ;Altadill, D.; Ebro Observatory, University Ramon Llull, CSIC, E-43520 Roquetes, Spain ;Magdaleno, S.; Atmospheric Sounding Station ‘‘El Arenosillo’’, INTA, Huelva, Spain ;Parisi, M.; Dipartimento di Fisica, Universita` degli Studi di Roma, 00185 Rome, Italy ;Torta, J. M.; Ebro Observatory, University Ramon Llull, CSIC, E-43520 Roquetes, Spain; ; ; ; ; ; ; ; ; ; ; ; ; ; The paper describes results of the studies devoted to the solar activity impact on the Earth’s upper atmosphere and ionosphere, conducted within the frame of COST ES0803 Action. Aim: The aim of the paper is to represent results coming from different research groups in a unified form, aligning their specific topics into the general context of the subject. Methods: The methods used in the paper are based on data-driven analysis. Specific databases are used for spectrum analysis, empirical modeling, electron density profile reconstruction, and forecasting techniques. Results: Results are grouped in three sections: Medium- and long-term ionospheric response to the changes in solar and geomag- netic activity, storm-time ionospheric response to the solar and geomagnetic forcing, and modeling and forecasting techniques. Section 1 contains five subsections with results on 27-day response of low-latitude ionosphere to solar extreme-ultraviolet (EUV) radiation, response to the recurrent geomagnetic storms, long-term trends in the upper atmosphere, latitudinal dependence of total electron content on EUV changes, and statistical analysis of ionospheric behavior during prolonged period of solar activity. Section 2 contains a study of ionospheric variations induced by recurrent CIR-driven storm, a case-study of polar cap absorption due to an intense CME, and a statistical study of geographic distribution of so-called E-layer dominated ionosphere. Section 3 comprises empirical models for describing and forecasting TEC, the F-layer critical frequency foF2, and the height of maximum plasma density. A study evaluates the usefulness of effective sunspot number in specifying the ionosphere state. An original method is presented, which retrieves the basic thermospheric parameters from ionospheric sounding data.343 657