Showing papers by "Royal Institute and Observatory of the Spanish Navy published in 2019"
TL;DR: In this paper, the authors search for coherent variations in the recorded clock frequency comparisons across the network, and significantly improve the constraints on transient variations of the fine structure constant, for example, constraining the variation in alpha to ~10^4 km.
Abstract: We search for transient variations of the fine structure constant using data from a European network of fiber-linked optical atomic clocks. By searching for coherent variations in the recorded clock frequency comparisons across the network, we significantly improve the constraints on transient variations of the fine structure constant. For example, we constrain the variation in alpha to ~10^4 km) objects.
37 citations
TL;DR: In this paper, the authors performed a regional scale analysis and interpretation of the shallow morpho-structure and active processes along the northern margin of the Dominican Republic and identified three morphostructural provinces: a) the Bahamas Carbonate Province, b) the Hispaniola Trench and c) the Insular Margin, which are divided into two tectonic domains, the Collision Domain and Underthrusting Domain.
14 citations
TL;DR: The NW Iberian margin is a hyperextended continental margin, formed during the opening of the North Atlantic Ocean, where a subsequent partial tectonic inversion has undergone during the Alpine Oro.
Abstract: The NW Iberian margin is a hyperextended continental margin, formed during the opening of the North Atlantic Ocean, where a subsequent partial tectonic inversion has undergone during the Alpine Oro...
7 citations
13 Apr 2019
TL;DR: The International Scientific Optical Network (ISON) as mentioned in this paper provides permanent monitoring of the whole GEO region, regular surveying of Molniya type orbits, and tracking of objects at GEO, GTO, HEO and LEO.
Abstract: Interagency International Scientific Optical Network (ISON) represents one of largest systems specializing in observation of space objects. ISON provides permanent monitoring of the whole GEO region, regular surveying
of Molniya type orbits, and tracking of objects at GEO, GTO, HEO and LEO. Currently ISON cooperates with 43 observation facilities of various affiliations with 100 telescopes in 17 countries. Six telescope subsets have been completed to the date, ISON encompasses five groups of telescopes and three scheduling centers. Obtained measurements are processed at the KIAM ballistic center to be used for scientific and applied goals, including collision risks analysis and space situation analysis. 20 millions measurements in 2.58 millions of tracklets for more 6740 objects have been collected by KIAM in 2016.
4 citations
01 Apr 2019
TL;DR: In this article, the authors present the results of the operational transfer of spectral purity at LNE-SYRTE in single-branch configurations between 698 nm, 1062 nm, 1160 nm and 1542 nm, with added noise in the 10-8 range.
Abstract: We present the results of the operational transfer of spectral purity at LNE-SYRTE. The frequency chain offers the possibility to transfer spectral properties in single-branch configurations between 698 nm, 1062 nm, 1160 nm and 1542 nm, with added noise in the 10-8 range. In this paper, we will discuss the results, we will analyze the impact of the different sources of noise and we will present the architecture of the frequency chain.