Search Results - "Ohma, Anders"

Estimating the Ionospheric Induction Electric Field Using Ground Magnetometers by Madelaire, Michael, Laundal, Karl, Hatch, Spencer, Vanhamäki, Heikki, Reistad, Jone, Ohma, Anders, Merkin, Viacheslav, Lin, Dong

“…The ionospheric convection electric field is often assumed to be a potential field. This assumption is not always valid, especially when the ionosphere changes…”
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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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Evolution of IMF By induced asymmetries during substorms: Superposed epoch analysis at geosynchronous orbit by Ohma, Anders, Laundal , Karl Magnus, Reistad , Jone Peter, Østgaard , Nikolai

“…The B y component of the magnetic field inside the magnetosphere is positively correlated with the B y component of the Interplanetary Magnetic Field (IMF)…”
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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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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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Dependence of the global dayside reconnection rate on interplanetary magnetic field By and the earth’s dipole tilt by Reistad, Jone Peter, Holappa, Lauri, Ohma, Anders, Gabrielse, Christine, Sur, Dibyendu, Asikainen, Timo, DeJong, Anna

“…In the recent years, significant attention has been given to the combined effect of Interplanetary Magnetic Field (IMF) duskward component (B y ) and dipole…”
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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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Comment on “Unraveling the Role of IMF B x in Driving Geomagnetic Activity” by Kubyshkina et al by Holappa, Lauri, Reistad, Jone Peter, Ohma, Anders

“…The coupling of the interplanetary magnetic field (IMF) with the Earth's magnetic field can result in spectacular auroral displays, including substorms. An…”
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Comment on “Unraveling the Role of IMF Bx in Driving Geomagnetic Activity” by Kubyshkina et al by Holappa, Lauri, Reistad, Jone Peter, Ohma, Anders

“…The coupling of the interplanetary magnetic field (IMF) with the Earth's magnetic field can result in spectacular auroral displays, including substorms. An…”
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The Magnitude of IMF B y Influences the Magnetotail Response to Solar Wind Forcing by Holappa, Lauri, Reistad, Jone Peter, Ohma, Anders, Gabrielse, Christine, Sur, Dibyendu

“…The dynamics of substorms are known to be dominated by the North‐South ( ) component of the Interplanetary Magnetic Field (IMF), which is the most important…”
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The Magnitude of IMF By Influences the Magnetotail Response to Solar Wind Forcing by Holappa, Lauri, Reistad, Jone Peter, Ohma, Anders, Gabrielse, Christine, Sur, Dibyendu

“…The dynamics of substorms are known to be dominated by the North‐South (Bz) component of the Interplanetary Magnetic Field (IMF), which is the most important…”
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The Ionospheric Leg of the Substorm Current Wedge: Combining Iridium and Ground Magnetometers by Walker, Simon James, Laundal, Karl Magnus, Reistad, Jone Peter, Hatch, Spencer Mark, Ohma, Anders, Gjerloev, Jesper

“…Utilizing magnetic field measurements made by the Iridium satellites and by ground magnetometers in North America we calculate the full ionospheric current…”
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Spatial Resolution in Inverse Problems: The EZIE Satellite Mission by Madelaire, Michael, Laundal, Karl, Gjerloev, Jesper, Hatch, Spencer, Reistad, Jone, Vanhamäki, Heikki, Waters, Colin, Ohma, Anders, Mesquita, Rafael, Merkin, Viacheslav

“…Inverse modeling has become one of the primary methods for studying ionospheric electrodynamics, especially when using magnetic field measurements from below…”
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North‐south asymmetries in cold plasma density in the magnetotail lobes: Cluster observations by Haaland, S., Lybekk, B., Maes, L., Laundal, K., Pedersen, A., Tenfjord, P., Ohma, A., Østgaard, N., Reistad, J., Snekvik, K.

“…In this paper, we present observations of cold (0–70 eV) plasma density in the magnetotail lobes. The observations and results are based on 16 years of Cluster…”
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