Blar i Faculty of Mathematics and Natural Sciences på tittel
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Observation of intrinsically bright terrestrial gamma ray flashes from the Mediterranean basin
(Peer reviewed; Journal article, 2015-12-14)We present three terrestrial gamma ray flashes (TGFs) observed over the Mediterranean basin by the Reuven Ramaty High Energy Solar Spectroscope Imager (RHESSI) satellite. Since the occurrence of these events in the ... -
Observation of light-by-light scattering in ultraperipheral Pb+Pb collisions with the ATLAS detector
(Peer reviewed; Journal article, 2019) -
Observation of photon-induced W+W− production in pp collisions at √s = 13 TeV using the ATLAS detector
(Journal article; Peer reviewed, 2021)This letter reports the observation of photon-induced production of W -boson pairs, γγ → W W . The analysis uses 139 fb−1 of LHC proton–proton collision data taken at √s = 13 TeV recorded by the ATLAS experiment during the ... -
Observation of Terrestrial Gamma-Ray Flashes at Mid Latitude
(Journal article; Peer reviewed, 2021)We present a sample of Terrestrial Gamma-ray Flashes (TGFs) observed at mid latitudes by the Atmosphere Space Interaction Monitor (ASIM). The events were detected between June 2018 and August 2020 in the latitude bands ... -
Observation of the associated production of a top quark and a Z boson in pp collisions at √s = 13 TeV with the ATLAS detector
(Journal article; Peer reviewed, 2020-07-20)Single top-quark production in association with a Z boson, where the Z boson decays to a pair of charged leptons, is measured in the trilepton channel. The proton-proton collision data collected by the ATLAS experiment ... -
Observation of the boson peak in a two-dimensional material
(Journal article; Peer reviewed, 2023)The boson peak is an excess in the phonon vibrational density of states relative to the Debye model. It has been observed in a wide range of amorphous materials, from inorganic glasses to polymers. Two-dimensional random ... -
Observation of the decay D0→K−π+e+e−
(Peer reviewed; Journal article, 2019) -
Observation of the Gamma-Ray Binary HESS J0632+057 with the H.E.S.S., MAGIC, and VERITAS Telescopes
(Journal article; Peer reviewed, 2021)The results of gamma-ray observations of the binary system HESS J0632 + 057 collected during 450 hr over 15 yr, between 2004 and 2019, are presented. Data taken with the atmospheric Cherenkov telescopes H.E.S.S., MAGIC, ... -
Observation of WWW production in pp collisions at √s=13 TeV with the ATLAS detector
(Journal article; Peer reviewed, 2022)This Letter reports the observation of WWW production and a measurement of its cross section using 139 fb−1 of proton-proton collision data recorded at a center-of-mass energy of 13 TeV by the ATLAS detector at the Large ... -
Observation on the survival of Francisella noatunensis in water and in blue mussel (Mytilus edulis)
(Master thesis, 2009-06-09)Francisellosis was discovered in farmed Atlantic cod (Gadus morhua) in the western parts of Norway in 2004. The bacterium Francisella noatunensis was identified as the causative agent. Today, francisellosis is known as one ... -
Observational and Model Impact of Tonga Volcano Eruption on Schumann Resonance
(Journal article; Peer reviewed, 2023)Tonga volcano eruption on 15 January 2022 was accompanied by an unprecedentedly high lightning activity in the volcano plume which significantly exceeded the lightning activity level of the whole globe. We compare model ... -
Observational evidence for on-shelf heat transport driven by dense water export in the Weddell Sea
(Journal article; Peer reviewed, 2023)The transport of oceanic heat towards the Antarctic continental margin is central to the mass balance of the Antarctic Ice Sheet. Recent modeling efforts challenge our view on where and how the on-shelf heat flux occurs, ... -
Observational evidence for throat aurora being associated with magnetopause reconnection
(Peer reviewed; Journal article, 2019)Throat auroras have been suggested to be related to indentations on the subsolar magnetopause. However, the indentation generation process and the resulting ionospheric responses have remained unknown. An EISCAT Svalbard ... -
Observational Evidence of Magnetic Reconnection in the Terrestrial Bow Shock Transition Region
(Journal article; Peer reviewed, 2019)We report evidence of magnetic reconnection in the transition region of the Earth's bow shock when the angle between the shock normal and the immediate upstream magnetic field is 65°. An ion‐skin‐depth‐scale current sheet ... -
Observational validation of the diffusive convection flux laws in the Amundsen Basin, Arctic Ocean
(Peer reviewed; Journal article, 2015-12)The low levels of mechanically driven mixing in many regions of the Arctic Ocean make double diffusive convection virtually the only mechanism for moving heat up from the core of Atlantic Water towards the surface. In an ... -
Observations of Asymmetric Lobe Convection for Weak and Strong Tail Activity
(Journal article; Peer reviewed, 2019)In this study we use high‐quality convection data from the Electron Drift Instrument on board Cluster to investigate how near‐Earth tail activity affects the average convection pattern in the magnetotail lobes when the ... -
Observations of asymmetries in ionospheric return flow during different levels of geomagnetic activity
(Peer reviewed; Journal article, 2018-06)It is known that the magnetic field of the Earth's closed magnetosphere can be highly displaced from the quiet‐day configuration when interacting with the interplanetary magnetic field (IMF), an asymmetry largely controlled ... -
Observations of barotropic oscillations and their influence on mixing in the Faroe bank channel overflow region
(Peer reviewed; Journal article, 2013)Observations of hydrography, currents, and microstructure are presented together with sea surface height (SSH) patterns from concurrent satellite tracks to describe the subinertial oscillations in the region downstream of ... -
Observations of Blue Corona Discharges in Thunderclouds
(Journal article; Peer reviewed, 2022)Blue electric streamer discharges in the upper reaches of thunderclouds are observed as flashes of 337.0 nm (blue) with faint or no emissions of 777.4 nm (red). Analyzing 3 years of measurements by the Atmosphere-Space ... -
Observations of bridge stay cable vibrations in dry and wet conditions: A case study
(Journal article; Peer reviewed, 2021-04-01)The characteristics of wind- and rain-wind-induced vibrations of bridge stay cables are studied by using ambient vibrations records acquired on a cable-stayed bridge. Mean wind speed and wind-cable angle, as well as the ...