120 citations · 620 across the 14 of their papers we have counts for
14 papers
Observations of Asymmetric Lobe Convection for Weak and Strong Tail Activity
A. Ohma, N. Østgaard, J. P. Reistad +6
In this study we use high-quality convection data from the Electron Drift Instrument on board Cluster to investigate how near-Earth tail activity affects the average convection pat…
Time-scale dependence of solar wind-based regression models of ionospheric electrodynamics
K. M. Laundal, J. P. Reistad, S. M. Hatch +6
The solar wind influence on geospace can be described as the sum of a directly driven component, or dayside reconnection, and an unloading component, associated with the release of…
Separation and Quantification of Ionospheric Convection Sources: 1. A New Technique
J. P. Reistad, K. M. Laundal, N. Østgaard +4
This paper describes a novel technique that allows separation and quantification of different sources of convection in the high-latitude ionosphere. To represent the ionospheric co…
Separation and Quantification of Ionospheric Convection Sources: 2. The Dipole Tilt Angle Influence on Reverse Convection Cells During Northward IMF
J. P. Reistad, K. M. Laundal, N. Østeward +5
This paper investigates the influence of Earth's dipole tilt angle on the reverse convection cells (sometimes referred to as lobe cells) in the Northern Hemisphere ionosphere durin…
How the IMF Induces a Local Component During Northward IMF and Characteristic Timescales
P. Tenfjord, N. Østgaard, S. Haaland +7
We use the Lyon-Fedder-Mobarry global magnetohydrodynamics model to study the effects of the interplanetary magnetic field (IMF) component on the coupling between…
Interplanetary Magnetic Field Component Influence on Horizontal and Field-Aligned Currents in the Ionosphere
K. M. Laundal, J. P. Reistad, C. C. Finlay +4
Statistical analyses have shown that the sunward component of the interplanetary magnetic field, (Geocentric Solar Magnetospheric), moderately but significantly af…
Observations of Asymmetries in Ionospheric Return Flow During Different Levels of Geomagnetic Activity
J. P. Reistad, N. Østgaard, K. M. Laundal +7
It is known that the magnetic field of the Earth's closed magnetosphere can be highly displaced from the quiet-day configuration when interacting with the interplanetary magnetic f…
Dayside and nightside magnetic field responses at 780 km altitude to dayside reconnection
K. Snekvik, N. Østgaard, P. Tenfjord +4
During southward interplanetary magnetic field, dayside reconnection will drive the Dungey cycle in the magnetosphere, which is manifested as a two-cell convection pattern in the i…
North-south asymmetries in cold plasma density in the magnetotail lobes: Cluster observations
S. Haaland, B. Lybekk, L. Maes +7
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 observation of space…
Defining and resolving current systems in geospace
N. Y. Ganushkina, M. W. Liemohn, S. Dubyagin +15
Electric currents flowing through near-Earth space ( 12 ) can support a highly distorted magnetic field topology, changing particle drift paths an…
North-South Asymmetries in Earth's Magnetic Field: Effects on High-Latitude Geospace
K. M. Laundal, I. Cnossen, S. E. Milan +5
The solar-wind magnetosphere interaction primarily occurs at altitudes where the dipole component of Earth's magnetic field is dominating. The disturbances that are created in this…
Birkeland current effects on high-latitude groundmagnetic field perturbations
K. M. Laundal, S. E. Haaland, N. Lehtinen +8
Magnetic perturbations on ground at high latitudes are directly associated only with the divergence-free component of the height-integrated horizontal ionospheric current, $\textbf…
Characteristics of the flankmagnetopause: Cluster observations
S. Haaland, J. Reistad, P. Tenfjord +6
The magnetopause is a current sheet forming the boundary between the geomagnetic field on one side and the shocked solar wind on the other side. This paper discusses properties of…
How the IMF induces a component in the closed magnetosphere and how it leads to asymmetric currents and convection patterns in the two hemispheres
P. Tenfjord, N. Østgaard, K. Snekvik +4
We used the Lyon-Fedder-Mobarry global magnetohydrodynamics model to study the effects of the interplanetary magnetic field (IMF) IMF component on the coupling bet…