Blar i Department of Physics and Technology på emneord "VDP::Matematikk og naturvitenskap: 400::Fysikk: 430::Rom- og plasmafysikk: 437"

Viser treff 1-11 av 11

    • Analysis of Ozone (O3) and Erythemal UV (EUV) measured by TOMS in the equatorial African belt 

      Ssenyonga, Taddeo; Stamnes, Jakob J.; Dahlback, Arne; Steigen, Andreas L; Okullo, Willy; Frette, Øyvind (Peer reviewed; Journal article, 2010-01-19)
      We presented time series of total ozone column amounts (TOCAs) and erythemal UV (EUV) doses derived from measurements by TOMS (Total Ozone Mapping Spectrometer) instruments on board the Nimbus-7 (N7) and the Earth Probe ...

    • Atmospheric Drag, Occultation 'N' Ionospheric Scintillation (ADONIS) mission proposal: Alpbach Summer School 2013 team orange 

      Hettrich, Sebastian; Kempf, Yann; Perakis, Nikolaos; Górski, Jędrzej; Edl, Martina; Urbář, Jaroslav; Dósa, Melinda; Gini, Francesco; Roberts, Owen W.; Schindler, Stefan; Schemmer, Maximilian; Steenari, David; Joldžić, Nina; Ødegaard, Linn-Kristine Glesnes; Sarria, David; Volwerk, Martin; Praks, Jaan (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 ...

    • Can magnetotail reconnection produce the auroral intensities observed in the conjugate ionosphere? 

      Østgaard, Nikolai; Snekvik, Kristian; Borg, Anette Lauen; Åsnes, Arne; Pedersen, Arne; Øieroset, Marit; Phan, Tai D.; Haaland, Stein (Peer reviewed; Journal article, 2009-06)
      [1] In a recent case study, Borg et al. (2007) reported that an inverted V structure, caused by a field-aligned potential drop of 30 kV producing very strong X-ray aurora, was found in connection with tail reconnection. ...

    • Dawn-dusk asymmetries in the coupled solar wind-magnetosphere-ionosphere system: a review 

      Walsh, Andrew P.; Haaland, Stein; Forsyth, Colin; Keesee, Amy M.; Kissinger, Jennifer; Li, Kun; Runov, Andrei; Soucek, Josef; Walsh, Brian M.; Wing, Simon; Taylor, Matthew G.G.T. (Peer reviewed; Journal article, 2014-07-01)
      Dawn–dusk asymmetries are ubiquitous features of the coupled solar-wind–magnetosphere–ionosphere system. During the last decades, increasing availability of satellite and ground-based measurements has made it possible to ...

    • Distribution of energetic oxygen and hydrogen in the near-Earth plasma sheet 

      Kronberg, Elena A.; Grigorenko, Elena; Haaland, Stein; Daly, Patrick W.; Delcourt, Dominique C.; Luo, Hao; Kistler, Lynn M.; Dandouras, Iannis (Peer reviewed; Journal article, 2015-05)
      The spatial distributions of different ion species are useful indicators for plasma sheet dynamics. In this statistical study based on 7 years of Cluster observations, we establish the spatial distributions of oxygen ions ...

    • GPS scintillation and irregularities at the front of an ionization tongue in the nightside polar ionosphere 

      van der Meeren, Christer; Oksavik, Kjellmar; Lorentzen, Dag Arne; Moen, Jøran Idar; Romano, Vincenzo (Peer reviewed; Journal article, 2014-10)
      In this paper we study a tongue of ionization (TOI) on 31 October 2011 which stretched across the polar cap from the Canadian dayside sector to Svalbard in the nightside ionosphere. The TOI front arrived over Svalbard ...

    • High-latitude magnetic fields and their time derivatives: interhemispheric similarities 

      Viljanen, Ari; Tanskanen, Eija Irene (Peer reviewed; Journal article, 2013-02-19)
      There are two simple and objective measures of geomagnetic activity: the daily range of field components, and the daily maximum of the time derivative of the field. We study these using data from the geomagnetic latitude ...

    • Results from the intercalibration of optical low light calibration sources 2011 

      Brändström, B. Urban E.; Enell, Carl-Fredrik; Widell, Ola; Hansson, Thord; Whiter, Daniel; Mäkinen, Sanna; Mikhaylova, Daria; Axelsson, Katarina; Sigernes, Fred; Gulbrandsen, Njål; Schlatter, Nicola M.; Gjendem, Amund Gjerde; Cai, L.; Reistad, Jone Peter; Daae, Marianne; Demissie, Teferi Dejene; Andalsvik, Yngvild Linnea; Roberts, Owen; Poluyanov, Stepan Viktorovich; Chernouss, Sergey (Peer reviewed; Journal article, 2012-05-03)
      Following the 38th Annual European Meeting on Atmospheric Studies by Optical Methods in Siuntio in Finland, an intercalibration workshop for optical low light calibration sources was held in Sodankylä, Finland. The main ...

    • Solar illumination control of ionospheric outflow above polar cap arcs 

      Maes, Lukas; Maggiolo, Romain; De Keyser, Johan; Dandouras, Iannis; Fear, Robert C.; Fontaine, Dominique; Haaland, Stein (Peer reviewed; Journal article, 2015-03-12)
      We measure the flux density, composition, and energy of outflowing ions above the polar cap, accelerated by quasi-static electric fields parallel to the magnetic field and associated with polar cap arcs, using Cluster. ...

    • Swarm in situ observations of F region polar cap patches created by cusp precipitation 

      Goodwin, Lindsay; Iserhienrhien, Blessing; Miles, David M.; Patra, Swadesh; van der Meeren, Christer; Buchert, Stephan C.; Burchill, Jonathan; Clausen, Lasse Boy Novock; Knudsen, David J.; McWilliams, Kathryn A.; Moen, Jøran Idar (Peer reviewed; Journal article, 2015-02-26)
      High-resolution in situ measurements from the three Swarm spacecraft, in a string-of-pearls configuration, provide new insights about the combined role of flow channel events and particle impact ionization in creating F ...

    • Time domain simulations of preliminary breakdown pulses in natural lightning 

      Carlson, Brant Edward; Liang, Can; Bitzer, Phillip M.; Christian, Hugh J. (Peer reviewed; Journal article, 2015-06)
      Lightning discharge is a complicated process with relevant physical scales spanning many orders of magnitude. In an effort to understand the electrodynamics of lightning and connect physical properties of the channel to ...