Thomas Gjesteland

Professor

Institutt for ingeniørvitenskap

E-post: thomas.gjesteland@uia.no
Telefon: +47 37233032
Mobiltelefon: +4741446418

Kontor C5102 (Jon Lilletuns vei 9, 4879 Grimstad, Norway)

Forskningsgrupper

Fysikk og anvendt matematikk

Ansvarsområde

2020 - present Director MatRIC

2019 - present member of Akademiet for yngre forskere (AYF)

2018 - 2020 Co-Director MatRIC

2017 - present Professor, University of Agder

2015 - 2017 Associate Professor, University of Agder

2013 - 2015 Researcher and Co-leader of CoE BCSS team Q4

2012 - 2013 Researcher at the University of Bergen, Norway

2007 - 2008 Assistant professor at the Bergen University College, Norway

2004 – 2007 Teaching assistant in mathematics at the University of Bergen, Norway

Education:

2008-2012 Ph.D. studies in space physics at the University of Bergen, Norway Thesis: “Properties of Terrestrial Gamma ray Flashes - Modelling and Analysis of BATSE and RHESSI data”.: University of Bergen 201 2 (ISBN 978-82-308-2060-5)

2002-2007 Master studies in space physics at the University of Bergen, Norway Thesis: “Terrestrial Gamma ray Flash - En Monte Carlo-simulering for å forstå deres fysiske egenskaper”

Pedagogical training

Basic course in pedagogical training, 2015 – 2016. A course containing 150 hours

Mathematics Teaching Course, University‐level Mathematics Teaching Course 2015‐2016 An induction course for mathematics teachers at higher education arranged by MatRIC/University of Agder in collaboration with the Norwegian University of Science and Technology (NTNU) (Course workload 100 hours)

Forskning

Faglige interesser

Undervisning

Høst 2017:

MA 154 Matematikk 1

Zakariya, Yusuf F.; Midttun, Øystein; Nyberg, Svein Olav Glesaaen & Gjesteland, Thomas (2022). Reforming the Teaching and Learning of Foundational Mathematics Courses: An Investigation into the Status Quo of Teaching, Feedback Delivery, and Assessment in a First-Year Calculus Course. Mathematics. ISSN 2227-7390. 10(13). doi: 10.3390/math10132164. Fulltekst i vitenarkiv
Gjesteland, Thomas & Vos, Pauline (2019). Affect and mathematical modeling assessment – A case study on students’ experience of challenge and flow during a compulsory mathematical modeling task by engineering students. I Chamberlin, Scott A. & Sriraman, Bharath (Red.), Affect in Mathematical Modeling. Springer Publishing Company. ISSN 978-3-030-04431-2. s. 257–272. doi: 10.1007/978-3-030-04432-9-16. Fulltekst i vitenarkiv Vis sammendrag
This chapter describes a study on engineering students’ affect while working on the Tracker Project Task, a group assessment task that asks students (1) to use digital tools (the camera in their smart phones and free tracker software) to capture the movement of an object, (2) to mathematically model that movement, and (3) to create a poster reporting on the video analysis of the movement. We applied an activity-based conceptualization of affect in mathematics (“do you like this activity?”), which differs from a subject-based conceptualization of affect (“do you like mathematics?”). A subject-based conceptualization has two drawbacks: (1) it does not distinguish among different aspects of mathematics, and (2) it draws in students’ bias and beliefs from earlier, often bad experiences of poor mathematics teaching. We found an activity-based operationalization of affect by using the concepts of challenge and flow. Flow is a state of absorption, in which people forget about time and experience feelings of happiness. We assessed n ¼ 346 students through the Tracker Project Task. To study affect, we developed an instrument of 10 items (Likert-type) to measure students’ experience of challenge and flow. We administered the survey through a web-based platform yielding a high response rate (n ¼ 239, 69%) and good reliability (Cronbach’s Alpha: 0,795). The results revealed that three out of five students experienced challenge and flow, which expresses students’ positive affect regarding a mathematical assessment activity. This can be ascribed to, on the one hand, the activity and the instrument not clearly being related to mathematics, and thus not being tainted by students’ earlier negative experiences with mathematics. On the other hand the Tracker Project Task had characteristics that can bring about flow: being open, offering ample time to submit the product, being accessible to all students (low floor), but also enabling the better students to challenge themselves further (high ceiling). Such characteristics may be better feasible within mathematical modeling assessment than canonical mathematics assessment.
Albrechtsen, Kjetil; Østgaard, Nikolai; Berge, Nini & Gjesteland, Thomas (2018). Observationally Weak TGFs in the RHESSI Data. Journal of Geophysical Research (JGR): Atmospheres. ISSN 2169-897X. 124(1), s. 287–298. doi: 10.1029/2018JD029272.
Gjesteland, Thomas; Vos, Pauline & Wold, Margrethe (2018). Mathematical modelling and activation – a study on a large class, a project-based task and students’ flow. International Network for Didactic Research in University Mathematics : INDRUM. ISSN 2496-1027. s. 175–184. Vis sammendrag
We studied how engineering students in a large class (n=346) can be activated by a project-based task, in which they have to model mathematically the motion of an object. The students had to throw an object, use (1) their smart phones for filming, and (2) tracker software for capturing the motion. Through a poster, they had to report their video analysis. We framed activation through the concept of flow, which is a state of being fully absorbed by an activity. We administered a web-based questionnaire (response rate 69%). The results show that such a project-based task is feasible with >300 students and activated them: three out of five experienced flow. Also, we validated the theory that for experiencing flow, a task must be perceived as challenging and that one’s skills should match that challenge.
Gjesteland, Thomas; Vos, Pauline & Wold, Margrethe (2017). Students experiencing flow in a Physics lab task using mobile phones and free software. I Tveiten, Oddgeir (Red.), Smart Universities: Education´s Digital Future. Logos Verlag Berlin. ISSN 978-3-8325-4595-6. s. 37–44.
Gjesteland, Thomas; Østgaard, Nikolai; Bitzer, Phillip & Christian, Hugh J. (2017). On the timing between terrestrial gamma ray flashes, radio atmospherics, and optical lightning emission. Journal of Geophysical Research (JGR): Space Physics. ISSN 2169-9380. 122(7), s. 7734–7741. doi: 10.1002/2017JA024285. Fulltekst i vitenarkiv
Østgaard, Nikolai; Carlson, Brant Edward; Nisi, Ragnhild Schrøder; Gjesteland, Thomas; Grøndahl, Øyvind & Skeltved, Alexander Broberg [Vis alle 10 forfattere av denne artikkelen] (2016). Relativistic electrons from sparks in the laboratory. Journal of Geophysical Research (JGR): Biogeosciences. ISSN 2169-8953. 121(6), s. 2939–2954. doi: 10.1002/2015JD024394.
Mezentsev, Andrey; Østgaard, Nikolai; Gjesteland, Thomas; Albrechtsen, Kjetil; Lehtinen, Nikolai & Marisaldi, Martino [Vis alle 8 forfattere av denne artikkelen] (2016). Radio emissions from double RHESSI TGFs. Journal of Geophysical Research (JGR): Biogeosciences. ISSN 2169-8953. 121(13), s. 8006–8022. doi: 10.1002/2016JD025111.
Østgaard, Nikolai; Albrechtsen, Kjetil; Gjesteland, Thomas & Collier, Andrew B. (2015). A new population of terrestrial gamma-ray flashes in the RHESSI data. Geophysical Research Letters. ISSN 0094-8276. 42(24), s. 10937–10942. doi: 10.1002/2015GL067064. Fulltekst i vitenarkiv
Gjesteland, Thomas; Østgaard, Nikolai; Laviola, Sante; Miglietta, Mario Marcelli; Arnone, Enrico & Marisaldi, Martino [Vis alle 10 forfattere av denne artikkelen] (2015). Observation of intrinsically bright terrestrial gamma ray flashes from the Mediterranean basin. Journal of Geophysical Research (JGR): Atmospheres. ISSN 2169-897X. 120(23), s. 12143–12156. doi: 10.1002/2015JD023704. Fulltekst i vitenarkiv
Marisaldi, Martino; Argan, Andrea; Ursi, Alessandro; Gjesteland, Thomas; Fuschino, Fabio & Labanti, Claudio [Vis alle 24 forfattere av denne artikkelen] (2015). Enhanced detection of terrestrial gamma-ray flashes by AGILE. Geophysical Research Letters. ISSN 0094-8276. 42(21), s. 9481–9487. doi: 10.1002/2015GL066100. Fulltekst i vitenarkiv Vis sammendrag
At the end of March 2015 the onboard software configuration of the Astrorivelatore Gamma a Immagini Leggero (AGILE) satellite was modified in order to disable the veto signal of the anticoincidence shield for the minicalorimeter instrument. The motivation for such a change was the understanding that the dead time induced by the anticoincidence prevented the detection of a large fraction of Terrestrial Gamma-Ray Flashes (TGFs). The configuration change was highly successful resulting in an increase of one order of magnitude in TGF detection rate. As expected, the largest fraction of the new events has short duration (<100 μs), and part of them has simultaneous association with lightning sferics detected by the World Wide Lightning Location Network. The new configuration provides the largest TGF detection rate surface density (TGFs/km2/yr) to date, opening prospects for improved correlation studies with lightning and atmospheric parameters on short spatial and temporal scales along the equatorial region.
Skeltved, Alexander Broberg; Østgaard, Nikolai; Carlson, Brant Edward; Gjesteland, Thomas & Celestin, Sebastien (2015). Modeling the relativistic runaway electron avalanche and the feedback mechanism with GEANT4. Journal of Geophysical Research (JGR): Space Physics. ISSN 2169-9380. 119(11), s. 9174–9191. doi: 10.1002/2014JA020504. Fulltekst i vitenarkiv
Nisi, Ragnhild Schrøder; Østgaard, Nikolai; Gjesteland, Thomas & Collier, Andrew B. (2014). An altitude and distance correction to the initial fluence distribution of TGFs. Journal of Geophysical Research (JGR). ISSN 0148-0227. 119(10), s. 8698–8704. doi: 10.1002/2014JA019817. Fulltekst i vitenarkiv
Hansen, Ragnhild Schrøder; Østgaard, Nikolai; Gjesteland, Thomas & Carlson, Brant Edward (2013). How simulated fluence of photons from terrestrial gamma ray flashes at aircraft and balloon altitudes depends on initial parameters. Journal of Geophysical Research (JGR). ISSN 0148-0227. 118(5), s. 2333–2339. doi: 10.1002/jgra.50143.
Østgaard, Nikolai; Gjesteland, Thomas; Carlson, Brant Edward; Collier, Andrew B.; Cummer, Steven A. & Lu, Gaopeng [Vis alle 7 forfattere av denne artikkelen] (2013). Simultaneous observations of optical lightning and terrestrial gamma ray flash from space. Geophysical Research Letters. ISSN 0094-8276. 40(10), s. 2423–2426. doi: 10.1002/grl.50466.
Østgaard, Nikolai; Gjesteland, Thomas; Hansen, Ragnhild Schrøder; Collier, Andrew B. & Carlson, Brant Edward (2012). The true fluence distribution of terrestrial gamma flashes at satellite altitude. Journal of Geophysical Research (JGR): Space Physics. ISSN 2169-9380. 117. doi: 10.1029/2011JA017365.
Gjesteland, Thomas; Østgaard, Nikolai; Collier, Andrew B.; Carlson, Brant Edward; Eyles, Chris J. & Smith, David M. (2012). A new method reveals more TGFs in the RHESSI data. Geophysical Research Letters. ISSN 0094-8276. 39. doi: 10.1029/2012GL050899.
Carlson, Brant Edward; Gjesteland, Thomas & Østgaard, Nikolai (2012). Connecting the terrestrial gamma-ray flash source strength and observed fluence distributions. Journal of Geophysical Research (JGR): Space Physics. ISSN 2169-9380. 117. doi: 10.1029/2011JA017122.
Carlson, Brant Edward; Gjesteland, Thomas & Østgaard, Nikolai (2011). Terrestrial gamma-ray flash electron beam geometry, fluence, and detection frequency. Journal of Geophysical Research (JGR): Space Physics. ISSN 2169-9380. 116. doi: 10.1029/2011JA016812.
Gjesteland, Thomas; Østgaard, Nikolai; Collier, A. B.; Carlson, Brant Edward; Cohen, M. B. & Lehtinen, N. G. (2011). Confining the angular distribution of terrestrial gamma ray flash emission. Journal of Geophysical Research (JGR): Space Physics. ISSN 2169-9380. 116. doi: 10.1029/2011JA016716.
Collier, Andrew B.; Gjesteland, Thomas & Østgaard, Nikolai (2011). Assessing the power law distribution of TGFs. Journal of Geophysical Research (JGR): Space Physics. ISSN 2169-9380. 116. doi: 10.1029/2011JA016612.
Cohen, Morris B.; Inan, Umran S.; Said, Ryan K. & Gjesteland, Thomas (2010). Geolocation of terrestrial gamma-ray flash source lightning. Geophysical Research Letters. ISSN 0094-8276. 37. doi: 10.1029/2009GL041753.
Gjesteland, Thomas; Østgaard, Nikolai; Connell, Paul H.; Stadsnes, Johan & Fishman, Gerald J. (2010). Effects of dead time losses on terrestrial gamma ray flash measurements with the Burst and Transient Source Experiment. Journal of Geophysical Research (JGR): Space Physics. ISSN 2169-9380. 115. doi: 10.1029/2009JA014578.
Østgaard, Nikolai; Gjesteland, Thomas; Stadsnes, Johan; Connell, Paul H. & Carlson, Bran (2008). Production altitude and time delays of the terrestrial gamma flashes: Revisiting the Burst and Transient Source Experiment spectra. Journal of Geophysical Research (JGR). ISSN 0148-0227. 113(A2). doi: 10.1029/2007JA012618.

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Bakke, Jostein; Langford, Malcolm; Børrud, Elin; Cotner, Sehoya Harris; Engebretsen, Eivind & Graver, Fredrik (Georg Fredrik) [Vis alle 14 forfattere av denne artikkelen] (2023). Fremtidens høyere utdanning trenger en oppgradering - ikke budsjettkutt! Khrono.no. ISSN 1894-8995.
Gjesteland, Thomas & Sydnes, Magne Olav (2023). Editorial. Nordic Journal of STEM Education. ISSN 2535-4574. 8(1).
Gjesteland, Thomas (2022). Norge trenger senter for fremragende utdanning. Khrono.
Gjesteland, Thomas (2022). Scholarly approaches to Teaching and Learning.
Gjesteland, Thomas; Lima, Vegard; Lunøe-Nielsen, Sverre A; Radmehr, Farzad & Goodchild, Simon (2021). Gruppebasert prosjektoppgave i matematikk: Veiledernes erfaringer.
Tranberg, Anders; Lurås, Inger Johanne; Jakobsen, Mette Mo; Siqveland, Arvid & Gjesteland, Thomas (2021). New Guidelines for the National Curriculum Regulations for Engineering Education in Norway(with emphasis on Mathematics) .
Langford, Malcolm; Larsen, Johanne Maria Rohde; Vandvik, Vigdis; Vabø, Ørjan Sørstrønen; Sindre, Guttorm & Gjesteland, Thomas [Vis alle 10 forfattere av denne artikkelen] (2020). Aune-utvalget vil gi bråstopp i utviklingen av gode vurderingsformer. Khrono.no. ISSN 1894-8995.
Eriksen, Marianne Hem; Gjesteland, Thomas & Bølstad, Jørgen (2020). «All forskning er vel ikke like bra?» En arkeolog, en fysiker og en statsviter svarer . Morgenbladet. ISSN 0805-3847.
Tjønndal, Anne Beret; Korsvoll, Nils Hallvard & Gjesteland, Thomas (2020). Er man hysterisk hvis man er redd for å bli smittet av koronaviruset her i Norge? Morgenbladet. ISSN 0805-3847.
Nilsen, Hans Kristian & Gjesteland, Thomas (2019). How do we get active students? Students enjoying transformed and improved learning experiences of mathematics in higher education.
Albrechtsen, Kjetil; Østgaard, Nikolai; Marisaldi, Martino; Gjesteland, Thomas & Berge, Nini (2017). Estimating the global production rate of TGFs.
Gjesteland, Thomas; Vos, Pauline & Wold, Margrethe (2017). Students experiencing flow in a Physics lab task using mobile phones and free software.
Gjesteland, Thomas & Vos, Pauline (2017). Assessment of Physics laboratory skills of engineering students – project-based assessment with mobile phones and free tracker software.
Gjesteland, Thomas & Vos, Pauline (2017). Modelling motion by engineering students - getting into a flow.
Gjesteland, Thomas & Vos, Pauline (2017). The Physics Lab experiment: Students Experiencing Flow.
Mezentsev, Andrey; Østgaard, Nikolai; Gjesteland, Thomas; Albrechtsen, Kjetil; Marisaldi, Martino & Smith, David [Vis alle 7 forfattere av denne artikkelen] (2016). Radio emissions from RHESSI TGFs.
Mezentsev, Andrey; Østgaard, Nikolai; Gjesteland, Thomas; Albrechtsen, Kjetil; Marisaldi, Martino & Smith, David [Vis alle 7 forfattere av denne artikkelen] (2016). Radio emissions from double RHESSI TGFs.
Mezentsev, Andrey; Østgaard, Nikolai; Gjesteland, Thomas; Albrechtsen, Kjetil & Cummer, Steven A. (2016). Radio emissions from RHESSI TGFs.
Gjesteland, Thomas; Vos, Pauline & Wold, Margrethe (2016). Students Experiencing Flow in a Physic Laboratory Task using Mobile Phones and Free Software.
Gjesteland, Thomas; Østgaard, Nikolai; Marisaldi, Martino; Briggs, M. S. & Smith, David M. (2016). Stereo Observations of Terrestrial Gamma-ray Flashes.
Østgaard, Nikolai; Gjesteland, Thomas; Carlson, Brant Edward; Collier, Andrew B.; Cummer, Steven A. & Lu, Gang [Vis alle 7 forfattere av denne artikkelen] (2015). Simultaneous observations of optical lightning and terrestrial gamma flash and radio signals on ground.
Albrechtsen, Kjetil; Østgaard, Nikolai; Gjesteland, Thomas & Collier, Andrew B. (2015). Do all lightning produce TGFs? Approaching this question using data from RHESSI and WWLLN.
Østgaard, Nikolai; Gjesteland, Thomas; Christian, Hugh; Albrechtsen, Kjetil; Carlson, Brant Edward & Collier, Andrew B. [Vis alle 8 forfattere av denne artikkelen] (2015). The sequence of events in a lightning stroke: terrestrial gamma ray flash, radio signal and optical lightning.
Østgaard, Nikolai; Gjesteland, Thomas; Carlson, Brant Edward; Collier, Andrew B.; Cummer, Steven A. & Lu, Gaopeng [Vis alle 7 forfattere av denne artikkelen] (2015). Simultaneous observations of optical lightning and terrestrial gamma flash from space and radio signals on ground.
Østgaard, Nikolai; Carlson, Brant Edward; Gjesteland, Thomas; Grøndahl, Øystein; kochkin, pavlo & Nisi, Ragnhild Schrøder (2015). Search for relativistic electrons in laboratory discharge experiments.
Mezentsev, Andrew; Østgaard, Nikolai; Gjesteland, Thomas; Skeltved, Alexander Broberg & Cummer, Steven A. (2015). VLF sferics associated with TGFs.
Aamodt, Vegard; Østgaard, Nikolai; Gjesteland, Thomas; Carlson, Brant Edward & Collier, Andrew B. (2015). Search for Terrestrial Electron Beams (TEBs) in SAMPEX data.
Skeltved, Alexander Broberg; Østgaard, Nikolai; Gjesteland, Thomas & Carlson, Brant Edward (2015). Modeling the production and acceleration of runaway electrons in strong inhomogeneous electric fields with GEANT4.
Gjesteland, Thomas; Christian, Hugh & Østgaard, Nikolai (2015). An observation of a TGF from the convective core of a thundercloud.
Infanger, Andrew; Smith, David M.; Gjesteland, Thomas & Østgaard, Nikolai (2014). Toward an optimized Third Catalog of RHESSI TGFs.
Østgaard, Nikolai; Carlson, Brant Edward; Grøndahl, Øystein; Nisi, Ragnhild Schrøder & Gjesteland, Thomas (2014). Search for X-rays and relativistic electrons in laboratory discharge experiments.
Skeltved, Alexander Broberg; Østgaard, Nikolai; Gjesteland, Thomas & Collier, Andrew B. (2014). Modelling the runaway electron avalanche and the feedback mechanism with GEANT4.
Aamodt, Vegard; Østgaard, Nikolai; Gjesteland, Thomas; Carlson, Brant Edward & Collier, Andrew B. (2014). Search for Terrestrial Electron Beams (TEB) in SAMPEX data.
Skeltved, Alexander Broberg; Østgaard, Nikolai; Carlson, Brant Edward & Gjesteland, Thomas (2014). A study of the runaway relativistic electron avalanche and the feedback theory using GEANT4.
Gjesteland, Thomas; Østgaard, Nikolai; Nisi, Ragnhild Schrøder; Collier, Andrew B.; Smith, David M. & Cummer, Steven A. [Vis alle 7 forfattere av denne artikkelen] (2014). Twelve Years of RHESSI TGFs - The second RHESSI TGF catalog.
Nisi, Ragnhild Schrøder; Østgaard, Nikolai & Gjesteland, Thomas (2014). An altitude and distance correction to the initial fluence distribution of TGF.
Østgaard, Nikolai; Gjesteland, Thomas; Carlson, Brant Edward; Collier, Andrew B.; Cummer, Steven A. & Lu, Gaopeng [Vis alle 7 forfattere av denne artikkelen] (2014). First simultaneous observations of optical lightning and terrestrial gamma flash from space.
Montanya, J.; Fabro, F; van der Velde, O; Aranguren, David; Williams, E. & Morales, C [Vis alle 12 forfattere av denne artikkelen] (2014). Lightning activity and radar for a TGF case in Colombia.
Østgaard, Nikolai; Carlson, Brant Edward; Grøndahl, Øystein; Kochkin, P; Nisi, Ragnhild Schrøder & Gjesteland, Thomas (2014). Search for X-rays and relativistic electrons in laboratory discharge experiments.
Kelley, N. A.; Smith, David M.; Bowers, G. S.; Buzbee, P; Dwyer, J. R. & Cramer, E. S. [Vis alle 10 forfattere av denne artikkelen] (2014). Recent Results from ADELE and RHESSI.
Gjesteland, Thomas (2013). Terrestrial Gamma ray Flashes, dark lightning and the dark side of dark lightning.
Kelley, N. A.; Smith, David M.; Bowers, G. S.; Dwyer, J. R.; Cummer, Steven A. & Gjesteland, Thomas [Vis alle 10 forfattere av denne artikkelen] (2013). Recent Results from ADELE and RHESSI.
Smith, David M.; Buzbee, P; Infanger, A; Cummer, Steven A.; Dwyer, J. R. & Lu, Gaopeng [Vis alle 8 forfattere av denne artikkelen] (2013). Results from the third RHESSI catalog of Terrestrial Gamma-ray Flashes.
Østgaard, Nikolai; Gjesteland, Thomas; Carlson, Brant Edward; Collier, Andrew B.; Cummer, Steven A. & Lu, Gaopeng [Vis alle 7 forfattere av denne artikkelen] (2013). First simultaneous observations of optical lightning and terrestrial gamma flash from space.
Collier, Andrew B.; Gjesteland, Thomas & Østgaard, Nikolai (2013). Intensity of Lightning Associated with TGFs.
Gjesteland, Thomas; Østgaard, Nikolai; Collier, Andrew B.; Martino, Marisaldi; Fabio, Fushino & Arnona, Enrico [Vis alle 7 forfattere av denne artikkelen] (2013). Terrestrial Gamma ray Flashes observed over low clod tops.
Gjesteland, Thomas; Østgaard, Nikolai; Marisaldi, Martino; Fabio, Fushino; Sante, Laviola & Collier, Andrew B. (2013). Terrestrial Gamma ray Flashes observed over low clod tops.
Gjesteland, Thomas (2013). Ser bak Lynet. Dagens næringsliv. ISSN 0803-9372.
Gjesteland, Thomas (2013). Det Gåtefulle gammaglimtet. Bergens Tidende. ISSN 0804-8983.
Nisi, Ragnhild Schrøder; Østgaard, Nikolai; Carlson, Brant Edward & Gjesteland, Thomas (2013). Modeling of the Bremsstrahlung process in connection to Terrestrial gamma-ray flashes.
Gjesteland, Thomas; Østgaard, Nikolai; Marisaldi, Martino; fuschino, f; arnona, e & laviola, s (2013). Unusual bright TGF from low cloud tops over the Mediterranean sea.
Skeltved, Alexander Broberg; Østgaard, Nikolai; Carlson, Brant Edward & Gjesteland, Thomas (2013). A study of the relativistiv runaway electron avalanche and the feedback theories to explain terrestrial gammaray production.
Hansen, Ragnhild Schrøder; Østgaard, Nikolai; Gjesteland, Thomas & Carlson, Brant Edward (2012). Fluence of photons from Terrestrial Gamma ray flashes in aircraft and balloon altitudes - dependence of initial parameters in simulations.
Østgaard, Nikolai; Carlson, Brant Edward; Hansen, Ragnhild Schrøder; Gjesteland, Thomas & Collier, Andrew B. (2011). The true distribution of TGF fluence measured from space.
Carlson, Brant Edward; Gjesteland, Thomas & Østgaard, Nikolai (2011). The TGF source luminosity distribution.
Østgaard, Nikolai; Hansen, Ragnhild Schrøder; Gjesteland, Thomas; Carlson, Brant Edward & Collier, Andrew B. (2011). Occurence frequency and fluence of TGFs.
Collier, Andrew B.; Gjesteland, Thomas & Østgaard, Nikolai (2011). Terrestrial Gamma-ray Flash Intensity Distribution.
Carlson, Brant Edward; Fishman, G; Briggs, M. S.; Cohen, M. B.; Østgaard, Nikolai & Said, R. K. [Vis alle 8 forfattere av denne artikkelen] (2011). Modeling TGF electron beams and constraints on the TGF source.
Vaktdal, Siri M.; Østgaard, Nikolai; Gjesteland, Thomas; Hansen, Ragnhild Schrøder; Collier, Andrew B. & Carlson, Brant Edward (2011). TGF dependence on magnetic latitude and solar zenith angle.
Collier, Andrew B.; Gjesteland, Thomas & Østgaard, Nikolai (2011). Terrestrial Gamma-Ray Flash Intensity Distribution.
Østgaard, Nikolai; Hansen, Ragnhild Schrøder; Gjesteland, Thomas; Carlson, Brant Edward & Collier, Andrew B. (2011). Occurence frequency and fluence of TGFs.
Collier, Andrew B. & Gjesteland, Thomas (2011). Terrestrial Gamma-ray flash intensity distribution.
Carlson, Brant Edward; Gjesteland, Thomas & Østgaard, Nikolai (2011). The frequency of terrestrial gamma-ray flash electron beam observations.
Gjesteland, Thomas (2011). Jordiske Gammaglimt.
Gjesteland, Thomas; Østgaard, Nikolai & Collier, Andrew B. (2011). Constrains on the Terrestrial Gamma-ray Flashes Emission Cone by Spectral Analysis of Geolocated Events. EGU.
Gjesteland, Thomas; Østgaard, Nikolai; Collier, Andrew B.; Carlson, Brant Edward; Hansen, Ragnhild Schrøder & Eyles, C [Vis alle 8 forfattere av denne artikkelen] (2011). Are there more TGFs in the RHESSI data.
Gjesteland, Thomas; Østgaard, Nikolai; Collier, Andrew B.; Carlson, Brant Edward; Cohen, Morris B. & Lehtinen, Nikolai (2011). Confining the angular distribution of TGF emission.
Østgaard, Nikolai; Gjesteland, Thomas; Connell, Paul H. & Stadsnes, Johan (2009). Production altitude, initial distributions and time delays for TGFs when instrumental deadtime effects are treated properly.
Gjesteland, Thomas; Østgaard, Nikolai; Connell, Paul H. & Stadsnes, Johan (2009). Analysis of BATSE TGFs taking instrumental limitations into account.
Østgaard, Nikolai; Gjesteland, Thomas; Connell, Paul H. & Stadsnes, Johan (2009). Analysis of a subset of BATSE TGFs that do not suffer from instrumental limitations.
Østgaard, Nikolai; Gjesteland, Thomas; Connell, Paul H. & Stadsnes, Johan (2008). Analysis of a subset of BATSE TGFs that do not suffer from instrumental limitations.
Gjesteland, Thomas; Østgaard, Nikolai; Connell, Paul H. & Stadsnes, Johan (2008). Monte Carlo simulation of the temporal behavior of Terrestrial Gamma ray Flashes and analysis of the BATSE measurements.
Østgaard, Nikolai; Gjesteland, Thomas; Stadsnes, Johan; Connell, Paul H. & Carlson, Brant (2008). The production altitude and time delays of the terrestrial gamma flashes - revisiting the BATSE spectra.
Gjesteland, Thomas; Østgaard, Nikolai; Connell, Paul H. & Stadsnes, Johan (2008). Monte Carlo simulation of the temporal behavior of Terrestrial Gamma ray Flashes.
Østgaard, Nikolai; Gjesteland, Thomas; Stadsnes, Johan; Connell, Paul H. & Carlson, Brant (2008). The production altitude and time delays of the terrestrial gamma flashes - revisiting the BATSE spectra.
Gjesteland, Thomas (2012). Properties of Terrestrial Gamma ray Flashes - Modelling and Analysis of BATSE and RHESSI data. Universitetet i Bergen. ISSN 978-82-308-2060-5.

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Publisert 16. apr. 2024 11:01