Search Results - "Laundal, Karl M"

Coincident particle and optical observations of nightside subauroral proton precipitation by Søraas, Finn, Laundal, Karl M., Usanova, Maria

“…We report two instances of nightside subauroral proton precipitation observed during a geomagnetic storm: (1) An arc at 蝶 50° magnetic latitude (MLAT), which…”
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Seasonal and Solar Cycle Variations of Thermally Excited 630.0 nm Emissions in the Polar Ionosphere by Kwagala, Norah Kaggwa, Oksavik, Kjellmar, Lorentzen, Dag A., Johnsen, Magnar G., Laundal, Karl M.

“…Solar cycle and seasonal variations have been found in the occurrence of strong thermally excited 630.0 nm emissions in the polar ionosphere. Measurements from…”
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The asymmetric geospace as displayed during the geomagnetic storm on 17 August 2001 by Østgaard, Nikolai, Reistad, Jone P., Tenfjord, Paul, Laundal, Karl M., Rexer, Theresa, Haaland, Stein E., Snekvik, Kristian, Hesse, Michael, Milan, Stephen E., Ohma, Anders

“…Previous studies have shown that conjugate auroral features are displaced in the two hemispheres when the interplanetary magnetic field (IMF) has a transverse…”
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A statistical study of polar cap flow channels observed in both hemispheres using SuperDARN radars by Herlingshaw, Katie, Baddeley, Lisa, Oksavik, Kjellmar, Lorentzen, Dag A., Laundal, Karl M.

“…This paper details the first large-scale, interhemispheric statistical study into ionospheric fast flow (>900 m/s) channels in the polar cap using the…”
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Polar ionospheric currents and high temporal resolution geomagnetic field models by Kloss, Clemens, Finlay, Christopher C, Laundal, Karl M, Olsen, Nils

“…SUMMARY Estimating high resolution models of the Earth’s core magnetic field and its time variation in the polar regions requires that one can adequately…”
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Occurrence Probability of Magnetic Field Disturbances Measured With Swarm: Mapping the Dynamic Magnetosphere‐Ionosphere Coupling by Decotte, Margot, Laundal, Karl M., Hatch, Spencer M., Reistad, Jone P.

“…The exchange of kinetic and electromagnetic energy by precipitation and/or outflow and through field‐aligned currents are two aspects of the…”
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Auroral Oval Morphology: Dawn‐Dusk Asymmetry Partially Induced by Earth's Rotation by Decotte, Margot, Laundal, Karl M., Hatch, Spencer M., Reistad, Jone P.

“…The auroral oval morphology has been investigated in previous studies presenting maps of average auroral precipitation. However, such distributions tend to…”
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Sunlight effects on the 3D polar current system determined from low Earth orbit measurements by Laundal, Karl M., Finlay, Christopher C., Olsen, Nils

“…Interaction between the solar wind and the Earth’s magnetosphere is associated with large-scale currents in the ionosphere at polar latitudes that flow along…”
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Timescales of Dayside and Nightside Field‐Aligned Current Response to Changes in Solar Wind‐Magnetosphere Coupling by Milan, Stephen E., Carter, Jennifer Alyson, Sangha, Harneet, Laundal, Karl M., Østgaard, Nikolai, Tenfjord, Paul, Reistad, Jone Peter, Snekvik, Kristian, Coxon, John C, Korth, Haje, Anderson, Brian J.

“…Principal component analysis is performed on Birkeland or field‐aligned current (FAC) measurements from the Active Magnetosphere and Planetary Electrodynamics…”
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Time-scale dependence of solar wind-based regression models of ionospheric electrodynamics by Laundal, Karl M., Reistad, Jone P., Hatch, Spencer M., Moretto, Therese, Ohma, Anders, Østgaard, Nikolai, Tenfjord, Paul A. R., Finlay, Christopher C., Kloss, Clemens

“…The solar wind influence on geospace can be described as the sum of a directly driven component, or dayside reconnection, and an unloading component,…”
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Transient high latitude geomagnetic response to rapid increases in solar wind dynamic pressure by Madelaire, Michael, Laundal, Karl M., Reistad, Jone P., Hatch, Spencer M., Ohma, Anders

“…Rapid changes in solar wind dynamic pressure can produce a transient geomagnetic response in the high latitude ionosphere. In this study we carry out a…”
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The relationship between interhemispheric asymmetries in polar ionospheric convection and the magnetic field line footpoint displacement field by Laundal, Karl M., Madelaire, Michael, Ohma, Anders, Reistad, Jone, Hatch, Spencer

“…Polar electrodynamics is largely controlled by solar wind and magnetospheric forcing. Different conditions can make plasma convection and magnetic field…”
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Geomagnetic Response to Rapid Increases in Solar Wind Dynamic Pressure: Event Detection and Large Scale Response by Madelaire, Michael, Laundal, Karl M., Reistad, Jone P., Hatch, Spencer M., Ohma, Anders, Haaland, Stein

“…Discontinuities in the solar wind trigger a variety of processes in the magnetosphere-ionosphere system. A rapid increase in solar wind dynamic pressure causes…”
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Polar ionospheric currents and high temporal resolution geomagnetic field models by Kloss, Clemens, Finlay, Christopher C, Laundal, Karl M, Olsen, Nils

“…Geophysical Journal International, Volume 235, Issue 2, November 2023, Pages 1736-1760 Estimating high resolution models of the Earth's core magnetic field and…”
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Sunlight effects on the 3D polar current system determined from low Earth orbit measurements by Laundal, Karl M, Finlay, Christopher C, Olsen, Nils

“…Interaction between the solar wind and the Earth's magnetosphere is associated with large-scale currents in the ionosphere at polar latitudes that flow along…”
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