Blar i NTNU Open på forfatter "Hibbins, Robert"
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Aeronomy of hydroxyl airglow variability by means of high-resolution telescope observations and gravity wave simulations
Franzen, Christoph (Doctoral theses at NTNU;2019:202, Doctoral thesis, 2019)Are there waves on the fjord right now? “Easy to find out”, you might think. Just go down to the water and have a look. Now imagine that you are in Oppdal, about 90 kilometres away, trying to see the waves on the fjord in ... -
Airglow Derived Measurements of Q-Branch Transition Probabilities for Several Hydroxyl Meinel Bands
Franzen, Christoph; Espy, Patrick Joseph; hofmann, niklas; Hibbins, Robert; Djupvik, Anlaug Amanda (Journal article; Peer reviewed, 2019)Spectroscopic measurements of the hydroxyl (OH) airglow emissions are often used to infer neutral temperatures near the mesopause. Correct Einstein coefficients for the various transitions in the OH airglow are needed to ... -
Aura MLS observations of the westward-propagating s=1, 16-day planetary wave in the stratosphere, mesosphere and lower thermosphere
Day, KA; Hibbins, Robert; Mitchell, NJ (Journal article; Peer reviewed, 2011)The Microwave Limb Sounder (MLS) on the Aura satellite has been used to measure temperatures in the stratosphere, mesosphere and lower thermosphere. The data used here are from August 2004 to December 2010 and latitudes ... -
Case study of a mesospheric wall event over Ferraz station, Antarctica (62 degrees S)
Bageston, JV; Wrasse, CM; Hibbins, Robert; Batista, PP; Gobbi, D; Takahashi, H; Fritts, DC; Andrioli, VF; Fechine, J; Denardini, CM (Journal article; Peer reviewed, 2011)On 16–17 July 2007 during an observational campaign at Comandante Ferraz Antarctic Station (62° S, 58° W), a mesospheric wall was observed with an airglow all-sky imager. The wave appeared like an extensive dark region in ... -
Characterisation of quasi-stationary planetary waves in the Northern MLT during summer
Stray, Nora Henriette; Espy, Patrick Joseph; Limpasuvan, Varavut; Hibbins, Robert (Journal article; Peer reviewed, 2015)Observations of planetary wave (PW) activity in the northern hemisphere, polar summer mesosphere and lower thermosphere (MLT) are presented. Meteor winds from a northern hemisphere chain of SuperDARN radars have been used ... -
Climatological Westward‐Propagating Semidiurnal Tides and Their Composite Response to Sudden Stratospheric Warmings in SuperDARN and SD‐WACCM‐X
Zhang, Z.; Limpasuvan, Varavut; Orsolini, Yvan J.; Espy, Patrick Joseph; Hibbins, Robert (Peer reviewed; Journal article, 2021)Using the Super Dual Auroral Radar Network observations (clustered around 60°N) and NCAR CESM2.0 extended Whole Atmosphere Community Climate Model nudged with reanalyzes, we examine the climatology of semidiurnal tides in ... -
Comparison of mesospheric winds from a high-altitude meteorological analysis system and meteor radar observations during the boreal winters of 2009-2010 and 2012-2013
McCormack, J; Hoppel, K; Kuhl, D; de Wit, R; Stober, G.; Espy, Patrick Joseph; Baker, N; Brown, P; Fritts, D; Jacobi, C.; Janches, D; Mitchell, N.; Ruston, B; Swadley, S; Viner, K; Whitcomb, T; Hibbins, Robert (Journal article; Peer reviewed, 2017)We present a study of horizontal winds in the mesosphere and lower thermosphere (MLT) during the boreal winters of 2009–2010 and 2012–2013 produced with a new high-altitude numerical weather prediction (NWP) system. This ... -
Coupling in the middle atmosphere related to the 2013 major sudden stratospheric warming
De Wit, Rosmarie Johanna; Hibbins, Robert; Espy, Patrick Joseph; Hennum, Endre Asheim (Journal article; Peer reviewed, 2015)The previously reported observation of anomalous eastward gravity wave forcing at mesopause heights around the onset of the January 2013 major sudden stratospheric warming (SSW) over Trondheim, Norway (63° N, 10° E), is ... -
Exploiting infrasound to probe the dynamics of the middle atmosphere
Vorobeva, Ekaterina (Doctoral theses at NTNU;2023:214, Doctoral thesis, 2023)This doctoral thesis examines the middle atmosphere (30 - 80 km altitude) using ground-based observations of low-frequency sound waves (infrasound). By exploiting infrasound waves, the thesis aims to increase observations ... -
Mesospheric CO above Troll station, Antarctica observed by a ground based microwave radiometer
Straub, Corinne; Espy, Patrick Joseph; Hibbins, Robert; Newnham, David (Journal article; Peer reviewed, 2013)This paper presents mesospheric carbon monoxide (CO) data acquired by the ground-based microwave radiometer of the British Antarctic Survey (BAS radiometer) stationed at Troll station in Antarctica (72° S, 2.5° E, 1270 m ... -
Migrating tide climatologies measured by a high-latitude array of SuperDARN HF radars
van Caspel, Willem Elias; Espy, Patrick Joseph; Hibbins, Robert; McCormack, John (Peer reviewed; Journal article, 2020)This study uses hourly meteor wind measurements from a longitudinal array of 10 high-latitude SuperDARN high-frequency (HF) radars to isolate the migrating diurnal, semidiurnal, and terdiurnal tides at mesosphere–lower-t ... -
Modelled effects of temperature gradients and waves on the hydroxyl rotational distribution in ground-based airglow measurements
Franzen, Christoph; Espy, Patrick Joseph; Hibbins, Robert (Journal article; Peer reviewed, 2020)Spectroscopy of the hydroxyl (OH) airglow has been a commonly used way to remotely sense temperatures in the mesopause region for many decades. This technique relies on the OH rotational state populations to be thermalized ... -
Modelling the descent of nitric oxide during the elevated stratopause event of January 2013
Orsolini, Yvan; Limpasuvan, Varavut; Pérot, Kristell; Espy, Patrick Joseph; Hibbins, Robert; Lossow, Stefan; Raaholt Larsson, Katarina; Murtagh, Donal (Journal article; Peer reviewed, 2017)Using simulations with a whole-atmosphere chemistry-climate model nudged by meteorological analyses, global satellite observations of nitrogen oxide (NO) and water vapour by the Sub-Millimetre Radiometer instrument (SMR), ... -
Observation of a mesospheric front in a thermal-doppler duct over King George Island, Antarctica
Bageston, JV; Wrasse, CM; Batista, PP; Hibbins, Robert; Fritts, DC; Gobbi, D; Andrioli, VF (Journal article; Peer reviewed, 2011)A mesospheric front was observed with an all-sky airglow imager on the night of 9–10 July 2007 at Ferraz Station (62° S, 58° W), located on King George island on the Antarctic Peninsula. The observed wave propagated from ... -
Observation of Quasiperiodic Structures in the Hydroxyl Airglow on Scales Below 100 m
Franzen, Christoph; Espy, Patrick Joseph; Hibbins, Robert; Djupvik, Anlaug Amanda (Journal article; Peer reviewed, 2018)Gravity waves are known to transport energy and momentum to the middle atmosphere. The breaking processes associated with divergence of fluxes of energy and momentum into the atmosphere occur on scales that cannot be ... -
Observational evidence of the influence of Antarctic stratospheric ozone variability on middle atmosphere dynamics
Narukull, Venkateswara Rao; Espy, Patrick Joseph; Hibbins, Robert; Fritts, David C.; Kavanagh, Andrew J. (Journal article; Peer reviewed, 2015)Modeling results have suggested that the circulation of the stratosphere and mesosphere in spring is strongly affected by the perturbations in heating induced by the Antarctic ozone hole. Here using both mesospheric MF ... -
Observations of gravity wave forcing of the mesopause region during the January 2013 major Sudden Stratospheric Warming
De Wit, Rosmarie Johanna; Hibbins, Robert; Espy, Patrick Joseph; Orsolini, Yvan; Limpasuvan, Varavut; Kinnison, Douglas E. (Journal article; Peer reviewed, 2014)Studies of vertical and interhemispheric coupling during Sudden Stratospheric Warmings (SSWs) suggest that gravity wave (GW) momentum flux divergence plays a key role in forcing the middle atmosphere, although observational ... -
Observations of planetary waves in the mesosphere-lower thermosphere during stratospheric warming events
Stray, Nora Henriette; Orsolini, Yvan; Espy, Patrick Joseph; Limpasuvan, Varavut; Hibbins, Robert (Journal article; Peer reviewed, 2015-05-04)This study investigates the effect of stratospheric sudden warmings (SSWs) on planetary wave (PW) activity in the mesosphere–lower thermosphere (MLT). PW activity near 95 km is derived from meteor wind data using a chain ... -
Optimizing an Infrared Camera for Observing Atmospheric Gravity Waves from a CubeSat Platform
Rønning, Snorre Stavik (Master thesis, 2012)The NTNU Test Satellite (NUTS) is a double CubeSat deigned by master students at NTNU. The goal of the project is to image atmospheric gravity waves in the OH airglow layer. This thesis explores the theory behind gravity ... -
Optimizing hydroxyl airglow retrievals from long-slit astronomical spectroscopic observations
Franzen, Christoph; Hibbins, Robert; Espy, Patrick Joseph; Djupvik, Anlaug Amanda (Journal article; Peer reviewed, 2017)Astronomical spectroscopic observations from ground-based telescopes contain background emission lines from the terrestrial atmosphere's airglow. In the near infrared, this background is composed mainly of emission from ...