Zobrazeno 1 - 10
of 188
pro vyhledávání: '"Snekvik K"'
Autor:
Tenfjord, P., Østgaard, N., Haaland, S., Snekvik, K., Laundal, K. M., Reistad, J. P., Strangeway, R., Milan, S. E., Hesse, M., Ohma, A.
We use the Lyon-Fedder-Mobarry global magnetohydrodynamics model to study the effects of the interplanetary magnetic field (IMF) $\mathit{B}_{y}$ component on the coupling between the solar wind and magnetosphere-ionosphere system when IMF $\mathit{B
Externí odkaz:
http://arxiv.org/abs/1808.05034
Autor:
Laundal, K. M., Reistad, J. P., Finlay, C. C., Østgaard, N., Tenfjord, P., Snekvik, K., Ohma, A.
Statistical analyses have shown that the sunward component of the interplanetary magnetic field, $\mathit{B}_{x}$ (Geocentric Solar Magnetospheric), moderately but significantly affects the auroral intensity. These observations have been interpreted
Externí odkaz:
http://arxiv.org/abs/1808.01844
Autor:
Reistad, J. P., Østgaard, N., Laundal, K. M., Ohma, A., Snekvik, K., Tenfjord, P., Grocott, A., Oksavik, K., Milan, S. E., Haaland, S.
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 field (IMF), an asymmetry largely controlled by the dawn-dusk component
Externí odkaz:
http://arxiv.org/abs/1808.01839
Autor:
Snekvik, K., Østgaard, N., Tenfjord, P., Reistad, J. P., Laundal, K. M., Milan, S. E., Haaland, S. E.
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 ionosphere. We address the response of the ionospheric convection to ch
Externí odkaz:
http://arxiv.org/abs/1705.07619
Autor:
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 observation of spacecraft potential measurements converted into local plasma densities. Me
Externí odkaz:
http://arxiv.org/abs/1701.05359
Autor:
Reistad, J. P., Østgaard, N., Tenfjord, P., Laundal, K. M., Snekvik, K., Haaland, S., Milan, S. E., Oksavik, K., Frey, H. U., Grocott, A.
Here we present an event where simultaneous global imaging of the aurora from both hemispheres reveals a large longitudinal shift of the nightside aurora of about 3 h, being the largest relative shift reported on from conjugate auroral imaging. This
Externí odkaz:
http://arxiv.org/abs/1606.08684
Autor:
Laundal, K. M., Haaland, S. E., Lehtinen, N., Gjerloev, J. W., Østgaard, N., Tenfjord, P., Reistad, J. P., Snekvik, K., Milan, S. E., Ohtani, S., Anderson, B. J.
Magnetic perturbations on ground at high latitudes are directly associated only with the divergence-free component of the height-integrated horizontal ionospheric current, $\textbf{J}_{\perp,df}$. Here we show how $\textbf{J}_{\perp,df}$ can be expre
Externí odkaz:
http://arxiv.org/abs/1606.02650
Autor:
Reistad, J. P., Østgaard, N., Laundal, K. M., Haaland, S., Tenfjord, P., Snekvik, K., Oksavik, K., Milan, S. E.
In the exploration of global-scale features of the Earth's aurora, little attention has been given to the radial component of the Interplanetary Magnetic Field (IMF). This study investigates the global auroral response in both hemispheres when the IM
Externí odkaz:
http://arxiv.org/abs/1606.01692
Autor:
Tenfjord, P., Østgaard, N., Snekvik, K., Laundal, K. M., Reistad, J. P., Haaland, S., Milan, S. E.
We used the Lyon-Fedder-Mobarry global magnetohydrodynamics model to study the effects of the interplanetary magnetic field (IMF) IMF $\mathit{B}_{y}$ component on the coupling between the solar wind and magnetosphere-ionosphere system. When the IMF
Externí odkaz:
http://arxiv.org/abs/1606.01074
Autor:
Laundal, K. M., Gjerloev, J. W., Østgaard, N., Reistad, J. P., Haaland, S., Snekvik, K., Tenfjord, P., Ohtani, S., Milan, S. E.
Ground magnetic field measurements can be mathematically related to an overhead ionospheric equivalent current. In this study we look in detail at how the global equivalent current, calculated using more than 30 years of SuperMAG magnetometer data, c
Externí odkaz:
http://arxiv.org/abs/1605.09595