Observatori de l'Ebre: Envíos recientes
Mostrando ítems 21-40 de 44
A method for real-time identification and tracking of traveling ionospheric disturbances using ionosonde data: first results
Traveling Ionospheric Disturbances (TIDs) are wave-like propagating irregularities that alter the electron density environment and play an important role spreading radio signals propagating through the ionosphere. A ...
Multipoint observation of the response of the magnetosphere and ionosphere related to the sudden impulse event on 19 November 2007
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, we chose the event ...
Detection of Solar Flares from the Analysis of Signal-to-Noise Ratio Recorded by Digisonde at Mid-Latitudes
This work proposes a new indirect method to detect the impact of solar flares on ionospheric sounding measurements, i.e., on the signal-to-noise ratio of ionospheric reflected radio signals. The method allows us to detect ...
The cyclic behaviour in the N–S asymmetry of sunspots and solar plages for the period 1910 to 1937 using data from Ebro catalogues
The heliophysics catalogues published by the Ebro Observatory during 1910-1937 have been converted into a digital format in order to provide the data for computational processing. This has allowed us to study in detail the ...
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
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 on the Earth’s ...
Expected Geomagnetically Induced Currents in the Spanish Islands Power Transmission Grids
The aim of this study is to evaluate the geomagnetically induced current (GIC) hazard in the power networks of the Canary and Balearic archipelagos. This is done in order to strictly complete the detailed assessment at ...
An example of operation for a partly manned Antarctic geomagnetic observatory and the development of a radio link for data transmission
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 ...
Narrowband and Wideband Channel Sounding of an Antarctica to Spain Ionospheric Radio Link
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 the geomagnetic and ...
Physical Layer Definition for a Long-Haul HF Antarctica to Spain Radio Link
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 years and also the ...
Behaviour of the quiet day geomagnetic variation at Livingston Island and variability of the Sq focus position in the South American-Antarctic Peninsula region
The characteristics of the regular daily variation at the relatively new geomagnetic observatory of Livingston Island have been studied. They include the seasonal and solar cycle variabilities. Studies of the solar cycle ...
Conductivities consistent with Birkeland currents in the AMPERE-driven TIE-GCM
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 unprecedented space and ...
SSC detection using wavelet analysis
For Sudden Storm Commencements, several methods aiming automatic detection of the events have been proposed. Most of them are based in the analysis of digital geomagnetic field data using some morphological aspects of ...
Remote Sensor Data Transmission from Antarctica to Spain with a Long-Haul HF Ionospheric Link
The geophysical observatory in the Antarctic Spanish Station Juan Carlos I (BAE), on Livingston Island (62.6S, 60.4W), has been monitoring the magnetic field in the Antarctic region for more than fifteen years. In 2004, a ...
Vertical and oblique ionospheric soundings over a very long multihop HF radio link from polar to midlatitudes: Results and relationships
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 communications between ...
A new approach to the hourly mean computation problem when dealing with missing data
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 products most widely ...
Midlatitude F region peak height changes in response to interplanetary magnetic field conditions and modeling results
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, season and ...
Geomagnetism at Ebro: Present and Future
Activities of research and services are performed at the magnetic section of Ebro Observatory. Most of the scientific projects are related to Solar_terrestrial Physics. Latest projects focused on Antarctic continent
Cent anys de suport a la recerca científica
Breu presentació del que ha estat l’experiència de suport a la recerca Geofísica a l'Observatori de l'Ebre, institució amb 110 anys d’història i allunyada de la gran ciutat. La funció desenvolupada per la seva biblioteca ...
Fons Monturiol a la Biblioteca de l'Observatori de l'Ebre: anàlisi grafològica de les anotacions i estudi de l'estat de conservació
L’any 2009, aprofitant els actes de la celebració del 150è aniversari de l’avarament de l’Ictíneu, es va donar a conèixer la troballa dels llibres propietat de Narcís Monturiol amb una exposició. El conjunt de llibres va ...
Vertical and Oblique ionospheric soundings over the long haul HF link between Antarctica and Spain
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 long haul link. The ...
