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Showing 1 to 17 of 17 for “"LOFAR"”.
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Dispersion measure variations in pulsar observations with LOFAR
… observations were taken using six International LOFAR Stations in Europe over the period of 3.5 years (between June 2014 and November 2017) at the centre frequency of 150 MHz with 80 MHz of bandwidth. During this time each pulsar was observed on weekly basis resulting in an average of 160 …
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Cosmic rays at LOFAR: precision measurements with a radio telescope
Contains fulltext : 207473.pdf (Publisher’s version ) (Open Access)
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Radio emission of air showers : the perspective of LOFAR and AERA
Contains fulltext : 129668.pdf (Publisher’s version ) (Open Access)
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Propagation of energetic electrons in the solar corona observed with LOFAR
… on other stars. The novel radio interferometer LOFAR provides imaging and spectroscopic capabilities to study these processes at low frequencies. Here it was used for solar observations. LOFAR, the characteristics of its solar data and the processing and analysis of the latter with the Solar …
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Studies of the Ionised Interstellar Medium at Low Radio Frequencies using LOFAR
… dealt with.<br /> The LOw Frequency ARray (LOFAR) telescope is part of a new generation of radio telescopes, which can point in any direction without moving parts, but rather by combining the signals received by a large number of antennas with high-performance computers. This allows for very …
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The low frequency array and the transient and variable radio sky
… facilities such as the Low Frequency Array (LOFAR). Studies of well known variable radio sources are presented in conjunction with blind searches of parameter space for unknown sources. Firstly, a three year campaign to monitor the low luminosity Active Galactic Nucleus NGC 7213 in the radio …
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Radio & Infrared Observations of the W3/W4/W5 Star-forming Regions
As part of the Low Frequency Array (LOFAR) Surveys KSP, targeted observations of H II regions close to high mass star-forming regions in the Galactic plane have been conducted, as part of the telescope’s commissioning. This thesis details the calibration and analysis of one particular commissioning …
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Exploiting pulsar timing at low radio frequencies: applications to Pulsar Timing Arrays, Interstellar medium and HII regions
… thesis is the combination of observations from LOFAR and NenuFAR with higher-frequency data from the European PTA (EPTA). By extending the frequency coverage of common pulsars, it becomes possible to place tighter constraints on chromatic delays, dispersion measure (DM) variations and …
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Multiobjective optimization of a radio telescope array with site constraints
… apply to arrays currently under design such as LOFAR, ATA, and the SKA. In the initial implementation of the framework, designs were evaluated with respect to two metrics, array imaging performance and the length of cable necessary to connect the stations which adhere to LOFAR design objectives …
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From Layout to Manufacturing
… Ferillinn sem þróaður var lofar góðu fyrir framhaldið og gæti reynst gríðarlega mikilvægt skref í áframhaldandi vinnu við að auka skilvirkni, lækka kostnað og stytta afhendingartíma.
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Tools, techniques, and early results in studies of 21 cm, Lyman-alpha, and H-alpha emission from the cosmic dawn
… radio and near-infrared surveys such as LOFAR and the Dark Energy Survey can start to probe optimistic models of the EOR.
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Samanburðarmælingar á afkvæmahópum Hryms við rússa- og síberíulerki á Belgsá, Höfða, Mosfelli og Sarpi
… og rússalerkis (Larix decidua × sukaczewii) lofar góðu hér á landi og er nefndur Hrymur af Þresti Eysteinssyni. Tilgangur mælinganna var að kanna mun á vexti, lifun og vaxtarlagi Hryms miðað við þekkt rússa- og síberíulerki við sama aldur og að bera mismunandi útgáfur Hryms saman til þess að …
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The very high energy gamma ray burst GRB190114C as observed by MeerKAT
… radio transients or variables. We apply the LOFAR Transients Pipeline (TraP) in this pursuit. The pipeline has been adapted for MeerKAT data. We discover 11 potential transient or variable candidates. We detail their light curves, images, multi-wavelength counterparts and classifications to …
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Toward detection and characterization of exoplanetary magnetic fields via low frequency radio observation
… b's putative magnetosphere. Data obtained from LOFAR LBA is used to set the lowest limits to date on radio flux from HD 80606 b near planetary periastron. The same concept of orbital phase targeting is used to optimize an observing strategy for recently-discovered multiple planet host …
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The faint low-frequency radio universe in continuum: exploitation of the pre-SKA deepest survey
… at an intermediate-low frequency (higher than LOFAR and lower than JVLA), where previous work has not been sensitive enough to reach the µJy population. By cross-matching against the multi-wavelength data, I identify 72% of the radio sample having reliable redshifts, of which 19% of the …
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Statistical properties of Radio Halos and the re-acceleration model
… expected to be discovered in the next future by LOFAR at 150 MHz. This is the first (and so far unique) model expectation for the number counts of Radio Halos at lower frequency and allows to design future radio surveys. Based on the results of Chapt. 6, in Chapt.7 we present a work in progress …