Search results for "DAS"
showing 10 items of 4164 documents
In Situ Generation of Transverse Magnetohydrodynamic Waves from Colliding Flows in the Solar Corona
2018
This research has received funding from the UK Science and Technology Facilities Council (Consolidated Grant ST/K000950/1) and the European Union Horizon 2020 Research and Innovation Programme (grant agreement No. 647214). V.M.N. acknowledges the support of the BK21 plus program through the National Research Foundation funded by the Ministry of Education of Korea. Transverse magnetohydrodynamic (MHD) waves permeate the solar atmosphere and are a candidate for coronal heating. However, the origin of these waves is still unclear. In this Letter, we analyze coordinated observations from Hinode/Solar Optical Telescope (SOT) and Interface Region Imaging Spectrograph (IRIS) of a prominence/corona…
Hydrogen non-equilibrium ionisation effects in coronal mass ejections
2020
This research has received funding from the Science and Technology Facilities Council (UK) through the consolidated grant ST/N000609/1 and the European Research Council (ERC) under the European Union Horizon 2020 research and innovation program (grant agreement No. 647214). D.H.M. would like to thank both the UK STFC and the ERC (Synergy grant: WHOLE SUN, grant Agreement No. 810218) for financial support. D.H.M. and P.P. would like to thank STFC for IAA funding under grant number SMC1-XAS012. This work used the DiRAC@Durham facility man-aged by the Institute for Computational Cosmology on behalf of the STFC DiRAC HPC Facility (www.dirac.ac.uk. The equipment was funded by BEIS capital fundin…
Determining the source and eruption dynamics of a stealth CME using NLFFF modelling and MHD simulations
2021
Coronal mass ejections (CMEs) that exhibit weak or no eruption signatures in the low corona, known as stealth CMEs, are problematic as upon arrival at Earth they can lead to geomagnetic disturbances that were not predicted by space weather forecasters. We investigate the origin and eruption of a stealth event that occurred on 2015 January 3 that was responsible for a strong geomagnetic storm upon its arrival at Earth. To simulate the coronal magnetic field and plasma parameters of the eruption we use a coupled approach. This approach combines an evolutionary nonlinear force-free field model of the global corona with a MHD simulation. The combined simulation approach accurately reproduces th…
MHD simulations of the in situ generation of kink and sausage waves in the solar corona by collision of dense plasma clumps
2019
Funding: This research has received funding from the UK Science and Technology Facilities Council (Consolidated Grant ST/K000950/1) and the European Union Horizon 2020 research and innovation programme (grant agreement No. 647214). P.A. acknowledges funding from his STFC Ernest Rutherford Fellowship (No. ST/R004285/1). This research was supported by the Research Council of Norway through its Centres of Excellence scheme, project number 262622. Context. Magnetohydrodynamic (MHD) waves are ubiquitous in the solar corona where the highly structured magnetic fields provide efficient wave guides for their propagation. While MHD waves have been observed originating from lower layers of the solar …
Contribution of phase-mixing of Alfvén waves to coronal heating in multi-harmonic loop oscillations
2018
This research has received funding from the Science and Technology Facilities Council (UK) through the consolidated grant ST/N000609/1 and the European Research Council (ERC) under the European Union’s Horizon 2020 research and innovation program ( grant agreement No. 647214). This work is supported by the European Research Council under the SeismoSun Research Project No. 321141 (DJP). This project has received funding from the European Research Council (ERC) under the European Union’s Horizon 2020 research and innovation programme (grant agreement No 724326). This work used the DiRAC Data Centric system at Durham University, operated by the Institute for Computational Cosmology on behalf o…
Future capabilities of CME polarimetric 3D reconstructions with the METIS instrument: A numerical test
2015
D.H.M. would like to thank STFC and the Leverhulme Trust for their financial support. P.P. would like to thank STFC and the Leverhulme Trust. The computational work for this paper was carried out on the joint STFC and SFC (SRIF) funded cluster at the University of St Andrews (Scotland, UK). Context. Understanding the 3D structure of coronal mass ejections (CMEs) is crucial for understanding the nature and origin of solar eruptions. However, owing to the optical thinness of the solar corona we can only observe the line of sight integrated emission. As a consequence the resulting projection effects hide the true 3D structure of CMEs. To derive information on the 3D structure of CMEs from whit…
Errores y dificultades de los futuros maestros de educación primaria al afrontar un problema de modelización asociado a la medida de magnitudes
2021
En este trabajo se presenta un análisis cualitativo de una experiencia con estudiantes de segundo curso del Grado de Maestro/a en Educación Primaria. Concretamente, se detallan los diferentes errores conceptuales y procedimentales cometidos al resolver una tarea de modelización asociado a la medida de magnitudes. El problema presentado requiere cálculos matemáticos elementales que deberían estar consolidados en estudiantes de grado. Es la primera vez que el alumnado aborda una propuesta de este tipo y, aunque la modelización matemática se ha demostrado como un elemento eficaz para potenciar los procesos de enseñanza-aprendizaje de las matemáticas, en este caso supone un obstáculo añadido. S…
Uzņēmuma "KPMG Baltics"AS saimnieciskās darbības analīze un attīstības perspektīvas
2020
Ar finanšu analīzes palīdzību uzņēmumam ir iespējams laicīgi identificēt saimnieciskās darbības problēmas un tās cēloņus, tādā veidā samazinot iespējamo zaudējumu apmēru nākotnē. Diplomdarba mērķis ir, balstoties uz finanšu analīzes teorijas izpēti un pamatojoties uz veikto finanšu analīzi, izstrādāt priekšlikumus tās uzlabošanai uzņēmumā “KPMG Baltics” AS. Pētījuma gaitā tiek konstatēts, ka uzņēmums “KPMG Baltics” AS finansiālais stāvoklis tiek vērtēts kā stabils un finanšu analīzes rezultātā ir vērojama uzņēmuma attīstība. Diplomdarba ietvaros tika novērtētas saimnieciskās darbības pozitīvās un negatīvās iezīmes, izdarīti secinājumi un izstrādāti iespējamie pasākumi uzņēmuma vadībai finan…
Ricerca di nuovi marcatori, diagnostici e prognostici, nella malattia di Fabry
Sex-specific responses to cold in a very cold-tolerant, northern Drosophila species
2021
Funding: This work was supported by Academy of Finland projects 268214 and 322980 to MK and a NERC (UK) grant NE/P000592/1 to MGR. Organisms can plastically alter resource allocation in response to changing environmental factors. For example, in harsh conditions, organisms are expected to shift investment from reproduction toward survival; however, the factors and mechanisms that govern the magnitude of such shifts are relatively poorly studied. Here we compared the impact of cold on males and females of the highly cold-tolerant species Drosophila montana at the phenotypic and transcriptomic levels. Although both sexes showed similar changes in cold tolerance and gene expression in response…