Enviaments recents
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The Evolution over Time and North–South Asymmetry of Sunspots and Solar Plages for the Period 1910 to 1937 Using Data from Ebro Catalogues
(Solar Phys (2020) 295:99, 2020-07-23)In this work, we analysed both the evolution over time and the north–south (N-S) asymmetry of certain solar features with regards to their morphological type and area. We examined and compared simultaneously ... -
Application of the Markov Chain Model to Sunspots and Solar Plages for the Period 1910 to 1937 Using Data fromEbro Catalogues
(Solar Physics (2021) 296:92, 2021-06-11)In this article, we analyzed the morphological evolution of the sunspot and solar calcium plage groups recorded at the Ebro Observatory in the period 1910–1937 to make predictions about several properties ... -
Temporal variation and asymmetry of sunspot and solar plage types from 1930 to 1936
(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 ... -
The Solar Rotation in the 1930s from the Sunspot and Flocculi Catalogs of the Ebro Observatory
(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 ... -
Modelling by Spherical Cap Harmonic Analysis: A Literature Review
(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 ... -
Improving the modeling of geomagnetically induced currents in Spain
(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 ... -
Automatic detection of sudden commencements using neural networks
(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
(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, ... -
New Detailed Modeling of GICs in the Spanish Power Transmission Grid
(2021-07-20)The threat of Geomagnetically Induced Currents (GICs) driven by severe Space Weather looms over technological systems such as power grids. Assessing their vulnerability is thus vital to avoid damages ... -
Expected Geomagnetically Induced Currents in the Spanish Islands Power Transmission Grids
(Space Weather, 2023-05-19)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 ... -
A method for real-time identification and tracking of traveling ionospheric disturbances using ionosonde data: first results
(Journal of Space Weather Space Climate, 2020, 10, 2, 2020-01-20)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 ... -
Detection of Solar Flares from the Analysis of Signal-to-Noise Ratio Recorded by Digisonde at Mid-Latitudes
(Remote Sensing, 2022, 14, 1898, 2022-04-14)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 ... -
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
(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 ... -
The cyclic behaviour in the N–S asymmetry of sunspots and solar plages for the period 1910 to 1937 using data from Ebro catalogues
(MNRAS 512, 5726–5742 (2022), 2022-03-14)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 ... -
An example of operation for a partly manned Antarctic geomagnetic observatory and the development of a radio link for data transmission
(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
(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 ... -
Vertical and oblique ionospheric soundings performance comparison over the 12,760 km transequatorial HF link between Antarctica and Spain
(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 ... -
Vertical and Oblique ionospheric soundings over the long haul HF link between Antarctica and Spain
(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
(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 ... -
Physical Layer Definition for a Long-Haul HF Antarctica to Spain Radio Link
(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 ...