| 1. |
- Backrud, M., et al.
(författare)
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Cluster observations and theoretical explanations of broadband waves in the auroral region
- 2005
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Ingår i: Annales Geophysicae. - : Copernicus Publications. - 1432-0576. ; 23, s. 3739-3752
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Tidskriftsartikel (refereegranskat)abstract
- Broadband waves are common on auroral field lines. We use two different methods to study the polarization of the waves at 10 to 180 Hz observed by the Cluster spacecraft at altitudes of about 4 Earth radii in the nightside auroral region. Observations of electric and magnetic wave fields, together with electron and ion data, are used as input to the methods. We find that much of the wave emissions are consistent with linear waves in homogeneous plasma. Observed waves with a large electric field perpendicular to the geomagnetic field are more common (electrostatic ion cyclotron waves), while ion acoustic waves with a large parallel electric field appear in smaller regions without suprathermal (tens of eV) plasma. The regions void of suprathermal plasma are interpreted as parallel potential drops of a few hundred volts.
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| 2. |
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| 3. |
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| 4. |
- Backrud, M., Wahlund, J., Andre, M., Balogh, A., Buckert, S., Cornilleau, N., Vaivads, A.
(författare)
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Widespread Eletrostatic ion Cyclotron/ion Acoustic Turbulence Above Auroral Acceleration Region, CLUSTER Observations
- 2003
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Ingår i: American Geophysical Union, Fall Meeting 2003.
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Konferensbidrag (övrigt vetenskapligt/konstnärligt)
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| 5. |
- Wahlund, J.-E., Yilmaz, A., Backrud, M., Sundkvist, D., Vaivads, A., Winningham, D., Andre, M., Balogh, A., Bonnell, J. Buckert, S. and 9 coauthors
(författare)
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Observations of auroral broadband emissions by CLUSTER
- 2003
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Ingår i: Geophysical Research Letters. - : American Goephysical Union. ; 30:11, s. 17-
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Tidskriftsartikel (refereegranskat)
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| 6. |
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| 7. |
- Stenberg, Gabriella, et al.
(författare)
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Internal structure and spatial dimensions of whistler wave regions in the magnetopause boundary layer
- 2007
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Ingår i: Annales Geophysicae. - : European Geosciences Union (EGU). - 0992-7689 .- 1432-0576. ; 25:11, s. 2439-2451
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Tidskriftsartikel (refereegranskat)abstract
- We use whistler waves observed close to the magnetopause as an instrument to investigate the internal structure of the magnetopause-magnetosheath boundary layer. We find that this region is characterized by tube-like structures with dimensions less than or comparable with an ion inertial length in the direction perpendicular to the ambient magnetic field. The tubes are revealed as they constitute regions where whistler waves are generated and propagate. We believe that the region containing tube-like structures extend several Earth radii along the magnetopause in the boundary layer. Within the presumed wave generating regions we find current structures moving at the whistler wave group velocity in the same direction as the waves.
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