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Anders Ohma

Postdoctoral fellow
  • E-mailAnders.Ohma@uib.no
  • Visitor Address
    Allegt. 55
  • Postal Address
    Postboks 7803
    5020 BERGEN
Academic article
  • Reistad, Jone Peter; Laundal, Karl Magnus; Østgaard, Nikolai; Ohma, Anders; Thomas, Evan G.; Haaland, Stein; Oksavik, Kjellmar; Milan, Stephen Eric. 2019. Separation and quantification of ionospheric convection sources: 2. The dipole tilt angle influence on reverse convection cells during northward IMF. Journal of Geophysical Research (JGR): Space Physics. 6182-6194.
  • Reistad, Jone Peter; Laundal, Karl Magnus; Østgaard, Nikolai; Ohma, Anders; Haaland, Stein; Oksavik, Kjellmar; Milan, Stephen Eric. 2019. Separation and quantification of ionospheric convection sources: 1. A new technique. Journal of Geophysical Research (JGR): Space Physics. 6343-6357.
  • Reistad, Jone Peter; Laundal, Karl Magnus; Ohma, Anders; Moretto, Therese; Milan, Steve. 2019. An explicit IMF By dependence on solar wind ‐ magnetosphere coupling. Geophysical Research Letters.
  • Østgaard, Nikolai; Reistad, Jone Peter; Tenfjord, Paul; Laundal, Karl Magnus; Rexer, Theresa; Haaland, Stein; Snekvik, Kristian; Hesse, Michael; Milan, Stephen Eric; Ohma, Anders. 2018. The asymmetric geospace as displayed during the geomagnetic storm on 17 August 2001. Annales Geophysicae. 1577-1596.
  • Reistad, Jone Peter; Østgaard, Nikolai; Laundal, Karl Magnus; Ohma, Anders; Snekvik, Kristian; Tenfjord, Paul; Grocott, Adrian; Oksavik, Kjellmar; Milan, Steve; Haaland, Stein. 2018. Observations of asymmetries in ionospheric return flow during different levels of geomagnetic activity. Journal of Geophysical Research (JGR): Space Physics. 4638-4651.
  • Laundal, Karl Magnus; Reistad, Jone Peter; Finlay, Christopher C.; Østgaard, Nikolai; Tenfjord, Paul; Snekvik, Kristian; Ohma, Anders. 2018. Interplanetary Magnetic Field Bx Component Influence on Horizontal and Field-Aligned Currents in the Ionosphere. Journal of Geophysical Research (JGR): Space Physics. 3360-3379.
  • Tenfjord, Paul; Østgaard, Nikolai; Haaland, Stein; Snekvik, Kristian; Laundal, Karl Magnus; Reistad, Jone Peter; Strangeway, Robert J.; Milan, Stephen Eric; Hesse, Michael; Ohma, Anders. 2018. How the IMF By Induces a Local By Component During Northward IMF Bz and Characteristic Timescales. Journal of Geophysical Research (JGR): Space Physics. 3333-3348.
  • Ohma, Anders; Østgaard, Nikolai; Reistad, Jone Peter; Tenfjord, Paul; Laundal, Karl Magnus; Snekvik, Kristian; Haaland, Stein; Fillingim, Matthew. 2018. Evolution of Asymmetrically Displaced Footpoints During Substorms. Journal of Geophysical Research (JGR): Space Physics. 10,030-10,063.
  • Haaland, Stein; Lybekk, Bjørn; Maes, Lukas; Laundal, Karl Magnus; Pedersen, Amund; Tenfjord, Paul; Ohma, Anders; Østgaard, Nikolai; Reistad, Jone Peter; Snekvik, Kristian. 2017. North-south asymmetries in cold plasma density in the magnetotail lobes: Cluster observations. Journal of Geophysical Research (JGR): Space Physics. 136-149.
Academic lecture
  • Ohma, Anders; Østgaard, Nikolai; Reistad, Jone Peter; Tenfjord, Paul; Laundal, Karl Magnus; Moretto, Therese; Haaland, Stein; Krcelic, Patrik; Milan, Stephen Eric. 2019. Observations of Asymmetric Lobe Convection for Weak and Strong Tail Reconnection.
  • Ohma, Anders; Østgaard, Nikolai; Reistad, Jone Peter; Tenfjord, Paul; Laundal, Karl Magnus. 2019. How asymmetries in Geospace evolve during increased tail reconnection.
  • Ohma, Anders; Østgaard, Nikolai; Reistad, Jone Peter; Tenfjord, Paul; Laundal, Karl Magnus. 2019. How Asymmetries in Geospace Evolve During Substorms.
  • Ohma, Anders; Østgaard, Nikolai; Reistad, Jone Peter; Tenfjord, Paul; Laundal, Karl Magnus; Moretto, Therese; Haaland, Stein; Krcelic, Patrik; Milan, S. E. 2019. Cluster EDI Observations of the Asymmetric Plasma Convection in the Magnetotail Lobes During Different Levels of Tail Reconnection Rate .
  • Reistad, Jone Peter; Laundal, Karl Magnus; Ohma, Anders; Østgaard, Nikolai; Thomas, Evan G.; Haaland, Stein; Oksavik, Kjellmar; Milan, Stephen Eric. 2019. A new way to identify and quantify the sources of ionospheric convection.
  • Reistad, Jone Peter; Laundal, Karl Magnus; Østgaard, Nikolai; Ohma, Anders; Snekvik, Kristian; Tenfjord, Paul. 2018. Plasma circulation inside the polar cap and lobe reconnection.
  • Reistad, Jone Peter; Østgaard, Nikolai; Laundal, Karl Magnus; Tenfjord, Paul; Snekvik, Kristian; Haaland, Stein; Milan, Stephen Eric; Ohma, Anders; Grocott, Adrian; Oksavik, Kjellmar. 2017. The influence of plasma flows bringing the magnetotail back to a more symmetric configuration.
  • Laundal, Karl Magnus; Reistad, Jone Peter; Tenfjord, Paul; Snekvik, Kristian; Østgaard, Nikolai; Ohma, Anders. 2017. Seasonal and IMF-controlled variations in the large-scale true horizontal ionospheric current.
  • Laundal, Karl Magnus; Finlay, Christopher C.; Olsen, NIls; Reistad, Jone Peter; Tenfjord, Paul; Østgaard, Nikolai; Ohma, Anders; Snekvik, Kristian; Haaland, Stein; Milan, Stephen Eric. 2017. North-south asymmetries in polar ionospheric currents - effects of asymmetries in the main magnetic field.
  • Haaland, Stein; Laundal, Karl Magnus; Lybekk, Bjørn; Baddeley, Lisa; Bjoland, Lindis Merete; Pedersen, Arne; Tenfjord, Paul; Østgaard, Nikolai; Gustavsson, Björn Johan; Reistad, Jone Peter; Snekvik, Kristian; Ohma, Anders. 2017. North-south asymmetries in lobe density: Cluster observations.
  • Haaland, Stein; Lybekk, Bjørn; Maes, Lukas; Laundal, Karl Magnus; Baddeley, Lisa; Bjoland, Lindis Merete; Pedersen, Arne; Tenfjord, Paul; Østgaard, Nikolai; Gustavsson, Björn Johan; Reistad, Jone Peter; Snekvik, Kristian; Ohma, Anders. 2017. North-South asymmetries in cold plasma density.
  • Laundal, Karl Magnus; Finlay, Christopher C.; Olsen, NIls; Reistad, Jone Peter; Tenfjord, Paul; Østgaard, Nikolai; Ohma, Anders; Snekvik, Kristian; Haaland, Stein; Milan, Stephen Eric. 2017. Characterizing external influence on the large-scale polar ionospheric current system.
Doctoral dissertation
  • Ohma, Anders. 2019. How Asymmetries in Geospace Evolve During Increased Tail Reconnection .
Poster
  • Reistad, Jone Peter; Laundal, Karl Magnus; Østgaard, Nikolai; Ohma, Anders; Thomas, Evan G.; Haaland, Stein; Oksavik, Kjellmar; Milan, Stephen Eric. 2019. Quantifying the dipole tilt influence on reverse convection cells during northward IMF using spherical elementary functions.
  • Reistad, Jone Peter; Laundal, Karl Magnus; Ohma, Anders; Østgaard, Nikolai; Thomas, Evan G.; Haaland, Stein; Oksavik, Kjellmar; Milan, Steve. 2019. A new way to identify and quantify the sources of ionospheric convection.
  • Ohma, Anders; Østgaard, Nikolai; Reistad, Jone Peter; Tenfjord, Paul; Laundal, Karl Magnus; Snekvik, Kristian; Fillingim, Matthew. 2018. Evolution of asymmetrically displaced footpoints during substorms.
  • Reistad, Jone Peter; Østgaard, Nikolai; Laundal, Karl Magnus; Tenfjord, Paul Arne Riksheim; Snekvik, Kristian; Haaland, Stein; Milan, Stephen Eric; Ohma, Anders; Grocott, Adrian; Oksavik, Kjellmar. 2017. When and where is the process of restoring symmetry important?
  • Ohma, Anders; Østgaard, Nikolai; Reistad, Jone Peter; Tenfjord, Paul; Laundal, Karl Magnus; Snekvik, Kristian; Fillingim, M. 2017. Evolution of asymmetrically displaced footpoints during substorms.
  • Ohma, Anders; Østgaard, Nikolai; Reistad, Jone Peter; Tenfjord, Paul; Laundal, Karl Magnus; Snekvik, Kristian. 2017. Evolution of asymmetrically displaced footpoints during substorms.

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