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Aspects of Electron Dynamics in Atoms Exposed to Single Cycle Electromagnetic Pulses
(Doctoral thesis, 2018-06-29)This thesis covers the topic in atomic physics: Interaction of a strong external field with Rydberg hydrogen atom. In three scientific publications, we have targeted physical processes such as the field ionization in the ... -
Aspects of in situ angular scattering measurements in contrasting waters
(Doctoral thesis, 2022-01-28)Rapid changes are observed in oceanic and coastal environments around the world due to global temperatures increases, ocean acidification and changing weather patterns - anthropogenic climate change. These changes have ... -
Assessing North Atlantic winter climate response to geomagnetic activity and solar irradiance variability
(Peer reviewed; Journal article, 2019)Recent studies suggest a response in the North Atlantic winter circulation which lags by a couple of years with respect to sunspot maximum. This has been explained by two different top‐down mechanisms: a solar wind driven ... -
The asymmetric geospace as displayed during the geomagnetic storm on 17 August 2001
(Peer reviewed; Journal article, 2018-11-29)Previous studies have shown that conjugate auroral features are displaced in the two hemispheres when the interplanetary magnetic field (IMF) has a transverse (Y) component. It has also been shown that a BY component is ... -
Asymmetric Ionospheric Equivalent Currents at Magnetic Conjugate Points
(Master thesis, 2017-07-01)In this thesis we will study high-latitude ionospheric equivalent currents at magnetic conjugate points. The following questions have been addressed in this thesis: What solar zenith angle defines the dark-sunlit terminator? ... -
Asymmetrically Varying Guide Field During Magnetic Reconnection: Particle-In-Cell Simulations
(Journal article; Peer reviewed, 2022)Using fully kinetic particle-in-cell modeling, we investigate how magnetic reconnection responds to a varying guide field in one of the inflow regions. We find that the reconnection rate varies significantly when the ... -
ATLAS b-jet identification performance and efficiency measurement with tt¯ events in pp collisions at √s=13 TeV
(Peer reviewed; Journal article, 2019)The algorithms used by the ATLAS Collaboration during Run 2 of the Large Hadron Collider to identify jets containing b-hadrons are presented. The performance of the algorithms is evaluated in the simulation and the efficiency ... -
ATLAS data quality operations and performance for 2015–2018 data-taking
(Journal article; Peer reviewed, 2020-04)The ATLAS detector at the Large Hadron Collider reads out particle collision data from over 100 million electronic channels at a rate of approximately 100 kHz, with a recording rate for physics events of approximately 1 ... -
ATLAS Detector Monitoring with Jets
(Master thesis, 2009-10-02)The purpose of this thesis was to provide a high level software framework for detecting large problems with the ATLAS detector at the LHC and estimate the jet resolution from the f irst data. The result was the program ... -
The ATLAS Fast TracKer system
(Journal article; Peer reviewed, 2021)The ATLAS Fast TracKer (FTK) was designed to provide full tracking for the ATLAS high-level trigger by using pattern recognition based on Associative Memory (AM) chips and fitting in high-speed field programmable gate ... -
ATLAS search for new phenomena in dijet mass and angular distributions using pp collisions at \(\sqrt{s}\)=7 TeV
(Peer reviewed; Journal article, 2013-01)Mass and angular distributions of dijets produced in LHC proton-proton collisions at a centre-of-mass energy \(\sqrt{s}\)=7 TeV have been studied with the ATLAS detector using the full 2011 data set with an integrated ... -
AtlFast3: The Next Generation of Fast Simulation in ATLAS
(Journal article; Peer reviewed, 2022)The ATLAS experiment at the Large Hadron Collider has a broad physics programme ranging from precision measurements to direct searches for new particles and new interactions, requiring ever larger and ever more accurate ... -
Atmospheric Drag, Occultation 'N' Ionospheric Scintillation (ADONIS) mission proposal: Alpbach Summer School 2013 team orange
(Peer reviewed; Journal article, 2015)The Atmospheric Drag, Occultation ‘N’ Ionospheric Scintillation mission (ADONIS) studies the dynamics of the terrestrial thermosphere and ionosphere in dependency of solar events over a full solar cycle in Low Earth Orbit ... -
Atomic resolution imaging of beryl: an investigation of the nano-channel occupation
(Peer reviewed; Journal article, 2016)Beryl in different varieties (emerald, aquamarine, heliodor etc.) displays a wide range of colours that have fascinated humans throughout history. Beryl is a hexagonal cyclo-silicate (ring-silicate) with channels going ... -
Auroral imaging as a tracer of global magnetospheric dynamics
(Doctoral thesis, 2010-11-12) -
Auroral oval morphology: Dawn-dusk asymmetry partially induced by Earth’s rotation
(Journal article; Peer reviewed, 2023)The auroral oval morphology has been investigated in previous studies presenting maps of average auroral precipitation. However, such distributions tend to emphasize auroral intensity rather than the actual extent of the ... -
Auroral Region Morphology and the Influence of Earth’s Rotation on Geospace Dynamics
(Doctoral thesis, 2024-06-07)Koblingen mellom solvinden, magnetosfæren, og ionosfæren er avgjørende for å forstå verdensrommet og dens påvirkning på Jorden. I de øvre lagene av atmosfæren ved polene, spesielt i området kjent som auroraregionen, møtes ... -
Automated XY-table for the characterisation of arrays of pixel sensors for photons and charge particles
(Master thesis, 2010-06-01)A variety of arrays of pixels sensors (pixel = picture elements) have been developed during the last 30 years for the detection of photons and charge particles. Pixel based semiconductor detectors are not only used for ... -
Autonomic Operation of a Large High Performance On-Line Compute Cluster
(Doctoral thesis, 2015-12-10)A High-Level Trigger (HLT) system is composed of both hardware and software. Designing the physical layout of the cluster mainly concerns the hardware; node distribution, network layout, estimation of power requirements, ... -
Azimuthal anisotropy of charged jet production in \(\sqrt{s_{\rm NN}}=2.76\) TeV Pb–Pb collisions
(Peer reviewed; Journal article, 2016-02)This paper presents measurements of the azimuthal dependence of charged jet production in central and semi-central \(\sqrt{s_{\rm NN}}=2.76\) TeV Pb–Pb collisions with respect to the second harmonic event plane, quantified ...