Hjem
Karl M. Laundals bilde

Karl M. Laundal

Forsker
  • E-postKarl.Laundal@uib.no
  • Telefon+47 55 58 27 06+47 913 50 772
  • Besøksadresse
    Allegt. 55
  • Postadresse
    Postboks 7803
    5020 BERGEN

Laundal, K. M. & Østgaard, N. Persistent global proton aurora caused by high solar wind dynamic pressure. J. Geophys. Res. 113. doi:10.1029/2008JA013147 (2008).

Laundal, K. M. & Østgaard, N. Asymmetric auroral intensities in the Earth’s Northern and Southern hemispheres. Nature 460, 491–493 (2009).

Laundal, K. M., Østgaard, N., Snekvik, K. & Frey, H. U. Inter-hemispheric observations of emerging polar cap asymmetries. J. Geophys. Res. doi:10.1029/2009JA015160 (2010).

Laundal, K. M., Østgaard, N., Frey, H. U. & Weygand, J. M. Seasonal and interplanetary magnetic field-dependent polar cap contraction during substorm expansion phase. J. Geophys. Res. doi:10.1029/ 2010JA015910 (2010).

Laundal, K. M. & Gjerloev, J. W. What is the appropriate coordinate system for magnetometer data when analyzing ionospheric currents? J. Geophys. Res. doi:10.1002/2014JA020484 (2014).

Laundal, K. M., Haaland, S. E., Lehtinen, N., Gjerloev, J. W., Ostgaard, N., Tenfjord, P., Reistad, J. P., Snekvik, K., Milan, S. E., Ohtani, S. & Anderson, B. J. Birkeland current effects on high-latitude ground magnetic field perturbations. Geophys. Res. Lett. doi:10.1002/2015GL065776 (2015).

Laundal, K. M., Gjerloev, J. W., Østgaard, N., Reistad, J. P., Haaland, S., Snekvik, K., Tenfjord, P., Ohtani, S. & Milan, S. E. The impact of sunlight on high-latitude equivalent currents. J. Geophys. Res. 2015JA022236. issn: 2169-9402. doi:10.1002/2015JA022236 (2016).

Laundal, K. M., Cnossen, I., Milan, S. E., Haaland, S. E., Coxon, J., Pedatella, N. M., Förster, M. & Reistad, J. P. North-South asymmetries in Earth’s magnetic field – Effects on high-latitude geospace. Space Sci. Rev. doi:10.1007/s11214-016-0273-0 (2017).

Laundal, K. M. & Richmond, A. D. Magnetic coordinate systems. Space Sci. Rev. doi:10.1007/s11214- 016-0275-y (2017).

Laundal, K. M., Finlay, C. C. & Olsen, N. Sunlight effects on the 3D polar current system determined from low Earth orbit measurements. Earth Planets Space. doi:10.1186/s40623-016-0518-x (2016).

Laundal, K. M., Reistad, J. P., Finlay, C. C., Østgaard, N., Tenfjord, P. & Snekvik, K. Interplanetary magnetic field Bx component influence on horizontal and field-aligned currents in the ionosphere. J. Geophys. Res. doi:10.1002/2017JA024864 (2018).

Laundal, K. M., Finlay, C. C., Olsen, N. & Reistad, J. P. Solar wind and seasonal influence on ionospheric currents from Swarm and CHAMP measurements. J. Geophys. Res. doi:10.1029/2018JA025387 (2018).

Reistad, J. P., Østgaard, N., Tenfjord, P., Laundal, K. M., Snekvik, K., Haaland, S., Milan, S., Oksavik, K., Frey, H. & Grocott, A. Dynamic effects of restoring footpoint symmetry on closed magnetic field-lines. J. Geophys. Res. doi:10.1002/2015JA022058 (2016).
  
Østgaard, N., Humberset, B. K. & Laundal, K. M. Evolution of auroral asymmetries in the conjugate hemispheres during two substorms. Geophys. Res. Lett. doi:10.1029/2010GL046057 (2011).

Østgaard, N., Laundal, K. M., Juusola, L., Aasnes, A., Haaland, S. E. & Weygand, J. Interhemispherical asymmetry of substorm onset locations and the interplanetary magnetic field. Geophys. Res. Lett. doi:doi:10.1029/2011GL046767 (2011).

Østgaard, N. & Laundal, K. M. Auroral Asymmetries in the Conjugate Hemispheres and Interhemi- spheric Currents in Auroral Phenomenology and Magnetospheric Processes: Earth And Other Planets (American Geophysical Union, 2013), 99–112. isbn: 9781118670286. doi:10.1029/2011GM001190.

Snekvik, K., Tanskanen, E., Østgaard, N., Juusola, L., Laundal, K. M., Gordeev, E. I. & Borg, A. L. Changes in the magnetotail configuration before near-Earth reconnection. J. Geophys. Res. 117 (2012).

Grujic, K. G., Hegna, T. & Laundal, K. M. In Situ Monitoring of Growth Interfaces: A Review of Noninvasive Methods. JOM 64, 96–101. issn: 1047-4838 (2012).

Søraas, F., Laundal, K. M. & Usanova, M. Coincident particle and optical observations of nightside subauroral proton precipitation. J. Geophys. Res. 118, 1112–1122 (2013).

Reistad, J. P., Østgaard, N., Laundal, K. M. & Oksavik, K. On the non-conjugacy of nightside aurora and their generator mechanisms. J. Geophys. Res. doi:10.1002/jgra.50300 (2013).

Reistad, J. P., Østgaard, N., Laundal, K. M., Haaland, S., Tenfjord, P., Snekvik, K., Oksavik, K. & Milan, S. E. Intensity asymmetries in the dusk sector of the poleward auroral oval due to IMF Bx. J. Geophys. Res. doi:10.1002/2014JA020216 (2014).

Tenfjord, P., Østgaard, N., Snekvik, K., Laundal, K. M., Reistad, J. P., Haaland, S. E. & Milan, S. E. How the IMF By induces a By component in the closed magnetosphere and how it leads to asymmetric currents and convection patterns in the two hemispheres. J. Geophys. Res. (2015).

Østgaard, N., Reistad, J. P., Tenfjord, P., Laundal, K. M., Snekvik, K., Milan, S. E. & Haaland, S. E. Mechanisms that Produce Auroral Asymmetries in Conjugate Hemispheres in Auroral Dynamics and Space Weather (John Wiley & Sons, Inc, 2015), 131–143. isbn: 9781118978719. doi:10.1002/ 9781118978719.ch10.

Tenfjord, P., Østgaard, N., Strangeway, R. J., Haaland, S., Snekvik, K., Laundal, K. M., Reistad, J. P. & Milan, S. E. Magnetospheric response and reconfiguration times following IMF By reversal. J. Geophys. Res. doi:10.1002/2016JA023018 (2017).

Haaland, S., Lybekk, B., Maes, L., Laundal, K. M., Pedersen, A., Tenfjord, P., Ohma, A., Østgaard, N., Reistad, J. P. & Snekvik, K. North-south asymmetries in cold plasma density in the magnetotail lobes: Cluster observations. J. Geophys. Res. doi:10.1002/2016JA023404 (2017).

Snekvik, K., Østgaard, N., Tenfjord, P., Reistad, J. P., Laundal, K. M., Milan, S. E. & Haaland, S. E. Dayside and nightside magnetic field responses at 780 km altitude to dayside reconnection. J. Geophys. Res. doi:10.1002/2016JA023177 (2017).

Milan, S. E., Clausen, L. B. N., Coxon, J. C., Carter, J. A., Walach, M.-T., Laundal, K., Østgaard, N., Tenfjord, P., Reistad, J., Snekvik, K., Korth, H. & Anderson, B. J. Overview of Solar Wind– Magnetosphere–Ionosphere–Atmosphere Coupling and the Generation of Magnetospheric Currents. Space Sci Rev. doi:10.1007/s11214-017-0333-0 (2017).

Friis-Christensen, E., Finlay, C. C., Hesse, M. & Laundal, K. M. Magnetic Field Perturbations from Currents in the Dark Polar Regions During Quiet Geomagnetic Conditions. Space Sci Rev. doi:10. 1007/s11214-017-0332-1 (2017).

Tenfjord, P., Østgaard, N., Haaland, S., Snekvik, K., Laundal, K. M., Reistad, J. P., Strangeway, R. J., Milan, S. E., Hesse, M. & Ohma, A. How the IMF By induces a local By component during northward IMF Bz and characteristic timescales. J. Geophys. Res. 123. doi:10.1002/2018JA025186 (2018).

Vitenskapelig artikkel
  • 2020. The Relationship Between Cusp Region Ion Outflows and East‐West Magnetic Field Fluctuations at 4,000‐km Altitude. Journal of Geophysical Research (JGR): Space Physics.
  • 2020. An Explicit IMF B 𝑦 Dependence on Solar Wind-Magnetosphere Coupling. Geophysical Research Letters. 8 sider.
  • 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.
  • 2019. Separation and quantification of ionospheric convection sources: 1. A new technique. Journal of Geophysical Research (JGR): Space Physics. 6343-6357.
  • 2019. Observations of asymmetric lobe convection for weak and strong tail activity. Journal of Geophysical Research (JGR): Space Physics. 9999-10017.
  • 2019. Magnetic Effects of Plasma Pressure Gradients in the Upper F Region. Geophysical Research Letters. 2355-2363.
  • 2019. IMF By Influence on Magnetospheric Convection in Earth's Magnetotail Plasma Sheet . Geophysical Research Letters. 11698-11708.
  • 2018. Timescales of dayside and nightside field-aligned current response to changes in solar wind-magnetosphere coupling. Journal of Geophysical Research (JGR): Space Physics. 7307-7319.
  • 2018. The asymmetric geospace as displayed during the geomagnetic storm on 17 August 2001. Annales Geophysicae. 1577-1596.
  • 2018. Solar Wind and Seasonal Influence on Ionospheric Currents From Swarm and CHAMP Measurements. Journal of Geophysical Research (JGR): Space Physics. 4402-4429.
  • 2018. Snakes on a spaceship—An overview of Python in heliophysics. Journal of Geophysical Research (JGR): Space Physics. 10,384-10,402.
  • 2018. Seasonal and solar cycle variations of thermally excited 630.0 nm emissions in the polar ionosphere. Journal of Geophysical Research (JGR): Space Physics. 7029-7039.
  • 2018. Observations of asymmetries in ionospheric return flow during different levels of geomagnetic activity. Journal of Geophysical Research (JGR): Space Physics. 4638-4651.
  • 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.
  • 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.
  • 2018. Evolution of Asymmetrically Displaced Footpoints During Substorms. Journal of Geophysical Research (JGR): Space Physics. 10,030-10,063.
  • 2017. Overview of solar wind - magnetosphere - ionosphere - atmosphere coupling and the generation of magnetospheric currents. Space Science Reviews. 547-573.
  • 2017. North-south asymmetries in cold plasma density in the magnetotail lobes: Cluster observations. Journal of Geophysical Research (JGR): Space Physics. 136-149.
  • 2017. Magnetic field perturbations from currents in the dark polar regions during quiet geomagnetic conditions. Space Science Reviews. 281-297.
  • 2017. Dayside and nightside magnetic field responses at 780 km altitude to dayside reconnection. Journal of Geophysical Research (JGR): Space Physics. 1670-1689.
  • 2016. The impact of sunlight on high-latitude equivalent currents. Journal of Geophysical Research (JGR): Space Physics. 2715-2726.
  • 2016. Sunlight effects on the 3D polar current system determined from low Earth orbit measurements. Earth Planets and Space.
  • 2016. Mechanisms that Produce Auroral Asymmetries in Conjugate Hemispheres. Geophysical Monograph.
  • 2016. Magnetospheric response and reconfiguration times following IMF By reversals. Journal of Geophysical Research (JGR): Space Physics. 417-431.
  • 2016. Magnetic coordinate systems. Space Science Reviews. 1-33.
  • 2016. Dynamic effects of restoring footpoint symmetry on closed magnetic field lines. Journal of Geophysical Research (JGR): Space Physics. 3963-3977.
  • 2015. How the IMF By induces a By component in the closed magnetosphere and how it leads to asymmetric currents and convection patternsin the two hemispheres. Journal of Geophysical Research (JGR): Space Physics. 9368-9384.
  • 2015. Birkeland current effects on high-latitude ground magnetic field perturbations. Geophysical Research Letters. 7248-7254.
  • 2014. What is the appropriate coordinate system for magnetometer data when analyzing ionospheric currents? Journal of Geophysical Research (JGR): Space Physics. 8637-8647.
  • 2014. Intensity asymmetries in the dusk sector of the poleward auroral oval due to IMF Bx. Journal of Geophysical Research (JGR): Space Physics. 9497-9507.
  • 2013. On the non-conjugacy of nightside aurora and their generator mechanisms. Journal of Geophysical Research (JGR): Space Physics. 3394-3406.
  • 2013. Coincident particle and optical observations of nightside subauroral proton precipitation. Journal of Geophysical Research (JGR): Space Physics. 1112-1122.
  • 2012. Correction to 'Interhemispherical asymmetry of substorm onset locations and the Interplanetary Magnetic Field.'. Geophysical Research Letters.
  • 2012. Changes in the magnetotail configuration before near-Earth reconnection. Journal of Geophysical Research (JGR): Space Physics. 12 sider.
  • 2011. Interhemispherical asymmetry of substorm onset locations and the interplanetary magnetic field. Geophysical Research Letters. 5 sider.
  • 2011. Evolution of auroral asymmetries in the conjugate hemispheres during two substorms. Geophysical Research Letters. 6 sider.
  • 2011. 3-D laser scanner system based on a galvanometer scan head for high temperature applications. Proceedings of SPIE, the International Society for Optical Engineering. 9 sider.
  • 2010. Seasonal and interplanetary magnetic field-dependent polar cap contraction during substorm expansion phase. Journal of Geophysical Research (JGR): Space Physics. A11224.
  • 2010. Interhemispheric observations of emerging polar cap asymmetries. Journal of Geophysical Research (JGR): Space Physics. 15 sider.
  • 2009. Asymmetric auroral intensities in the Earth's Northern and Southern hemispheres. Nature. 491-493.
  • 2008. Persistent global proton aurora caused by high solar wind dynamic pressure. Journal of Geophysical Research (JGR). 8 sider.
Faglig foredrag
  • 2014. Seasonal differences in ionospheric current rise and decay times.
Vitenskapelig foredrag
  • 2019. Thermally excited 630.0 nm emissions in the polar ionosphere.
  • 2019. The relative importance of diamagnetic effects in the high-latitude ionosphere.
  • 2019. Swarm as a platform for ion outflow studies.
  • 2019. Southern and Northern Hemisphere relationships between ion outflow and magnetic field fluctuations .
  • 2019. Observations of Asymmetric Lobe Convection for Weak and Strong Tail Reconnection.
  • 2019. How asymmetries in Geospace evolve during increased tail reconnection.
  • 2019. How Asymmetries in Geospace Evolve During Substorms.
  • 2019. FAST observations of cusp/cleft-region ion upflow and field variations.
  • 2019. Cluster EDI Observations of the Asymmetric Plasma Convection in the Magnetotail Lobes During Different Levels of Tail Reconnection Rate .
  • 2019. A new way to identify and quantify the sources of ionospheric convection.
  • 2018. Plasma circulation inside the polar cap and lobe reconnection.
  • 2017. The influence of plasma flows bringing the magnetotail back to a more symmetric configuration.
  • 2017. The CHAOS-X Model and Uncertainty Values for Magnetic Directional Surveying.
  • 2017. Seasonal and IMF-controlled variations in the large-scale true horizontal ionospheric current.
  • 2017. Production and visualization of a climatological model of high-latitude ionospheric and field aligned current systems.
  • 2017. Norwegian contributions to the ISWI program.
  • 2017. North-south asymmetries in polar ionospheric currents - effects of asymmetries in the main magnetic field.
  • 2017. North-south asymmetries in lobe density: Cluster observations.
  • 2017. North-South asymmetries in cold plasma density.
  • 2017. How the IMF By induces a By-component on closed field lines during northward IMF Bz.
  • 2017. High latitude currents and convection during quiet times.
  • 2017. Hemispherical differences in the Ionospheric current system as seen by Swarm and CHAMP.
  • 2017. Dayside and nightside magnetic field responses at 780 km altitude to dayside reconnection.
  • 2017. Characterizing external influence on the large-scale polar ionospheric current system.
  • 2015. Statistical maps of Birkeland currents from Swarm magnetometer measurements.
  • 2015. On which timescales are By induced in the closed magnetosphere?
  • 2015. North-south asymmetries in magnetospheric and ionospheric plasma circulation (Invited).
  • 2015. Magnetic field patterns near the polar cap boundary.
  • 2015. Generation of Birkeland Currents during IMF By; Mechanisms and theory.
  • 2015. Effects of electric field component representation on estimated cross polar cap potential - Implications for interhemispheric asymmetries.
  • 2015. Effects of electric field component representation on estimated cross polar cap potential - Implications for interhemispheric asymmetries.
  • 2015. Current systems associated with Non-Conjugate Aurora.
  • 2015. Are there auroral signatures related to asymmetric generation of field-aligned currents in the tail due to an IMF By induced twist?
  • 2014. Techniques for fast measurement of cylinder diameter outdoors.
  • 2014. Hemispheric differences in solar wind – magnetosphere interactions.
  • 2014. Conjugate and non-conjugate aspects of the aurora.
  • 2014. Comparison of solar wind driving of the aurora in the two hemispheres due to the solar wind dynamo.
  • 2014. Comparison of solar wind driving of the aurora in the two hemispheres due to solar wind dynamo.
  • 2014. Asymmetric Solar Wind dynamo efficiency and IMF Bx.
  • 2013. What are the mechanisms that produce auroral asymmetries in the conjugate hemispheres?
  • 2013. Simultaneous global imaging as a tracer of true conjugate regions.
  • 2013. Non-Conjugate Features in the Auroral Ovals in the two Hemispheres.
  • 2013. Investigation of the role of IMF Bx on magnetopause characteristic past the terminator.
  • 2013. Investigation of a possible IMF Bx influence on magnetopause characteristics.
  • 2013. Investigation of a possible IMF Bx influence on magnetopause characteristic.
  • 2013. Inter-hemispheric currents in the ring current region.
  • 2013. Intensity asymmetries between the northern and southern auroral ovals associated with the x-component of the Interplanetary Magnetic Field.
  • 2011. Particle and optical observations of subauroral proton precipitation.
  • 2011. Observations of energetic protons and auroral light during geomagnetic storms.
  • 2011. Auroral asymmetries in the conjugate hemispheres during substorm onset and expansion phase.
  • 2011. Auroral asymmetries in the conjugate hemispheres.
  • 2011. Asymmetries of substorm onset location and the dynamic behavior of auroral substorms during expansion phase.
  • 2009. Substorm auroral asymmetries in the conjugate hemispheres during onset and expansion phase.
  • 2009. IPY-ICESTAR Arctic Frontiers.
  • 2009. IMF Bx Effects on Interhemispheric Polar Cap Asymmetries Inferred From Conjugate Auroral Imaging.
  • 2009. Conjugate aurora observations of substorms IAGA meeting.
  • 2009. Asymmetric aurora detected in the two hemispheres simultaneously.
  • 2009. Asymmetric aurora detected in the two hemispheres simultaneously.
  • 2009. Asymmetric aurora detected in the two hemispheres simultaneously.
  • 2008. What are the ionospheric signatures of magnetotail reconnection?
  • 2008. Conjugate observations of substorm onset and expansion in the two hemispheres.
  • 2008. Conjugate imaging of substorms.
  • 2008. Auroral conjugacy studies.
  • 2007. Solar wind pressure as a cause for persistent proton precipitation.
Mastergradsoppgave
  • 2007. Storm Time Observations of the Global Proton Aurora.
Doktorgradsavhandling
  • 2010. Auroral Imaging as a Tracer of Global Magnetospheric Dynamics.
Poster
  • 2019. Quantifying the dipole tilt influence on reverse convection cells during northward IMF using spherical elementary functions.
  • 2019. A new way to identify and quantify the sources of ionospheric convection.
  • 2018. How the IMF BY induces a BY component on closed field lines during northward IMF Bz and characteristic timescales.
  • 2018. Evolution of asymmetrically displaced footpoints during substorms.
  • 2017. When and where is the process of restoring symmetry important?
  • 2017. The asymmetric geospace - the most common state of the system.
  • 2017. How the IMF By induces a By-component on closed field lines during northward IMF Bz.
  • 2017. Evolution of asymmetrically displaced footpoints during substorms.
  • 2017. Evolution of asymmetrically displaced footpoints during substorms.
  • 2016. North-south asymmetries in cold ion outflow and lobe density.
  • 2016. How the IMF By induces a By component on closed field lines during northward IMF Bz.
  • 2016. Dynamic effects of restoring footpoint symmetry on closed magnetic field-lines: Asymmetric Birkeland currents.
  • 2015. The Impact of IMF By on the Magnetosphere-Ionosphere System.
  • 2015. On the importance of magnetotail untwisting.
  • 2015. On the importance of magnetotail untwist.
  • 2015. Birkeland Current Effects on High-Latitude Ground Magnetic Field Perturbations.
  • 2014. What is the Appropriate Coordinate System for Magnetometer Data when Analyzing Ionospheric Currents?
  • 2014. Hemispheric asymmetries in the global aurora and IMF Bx.
  • 2014. Generation of Field Aligned Currents during IMF By: Mechanisms and theory.
  • 2013. Solar wind dynamic pressure effect on global auroral intensity.
  • 2013. Inter-hemispheric currents in the ring current region as seen by the Cluster spacecraft.
  • 2013. How IMF Bx affects the two polar hemispheres differently.
  • 2013. How IMF Bx affects the two hemispheres differently.
  • 2013. Auroral intensity asymmetries associated with the x-component of the interplanetary magnetic field in the two polar hemispheres.
  • 2012. Non-conjugate aurora and inter hemispheric currents.
  • 2012. Asymmetric field-aligned currents in the conjugate hemispheres.
  • 2009. A case study of auroral conjugacy based on global imaging.
  • 2008. Auroral asymmetries in the conjugate hemispheres during strong IMF Bx.
Errata
  • 2013. Correction to 'Evolution of auroral asymmetries in the conjugate hemispheres during two substorms.'. Geophysical Research Letters. 471-471.
Vitenskapelig oversiktsartikkel/review
  • 2016. North–south asymmetries in Earth’s magnetic field effects on high-latitude geospace. 225-257.
  • 2012. In situ monitoring of growth interfaces: a review of noninvasive methods. 96-101.
Populærvitenskapelig kapittel/artikkel
  • 2016. Auroral research and the total solar eclipse. 13 sider.

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