| 1. |
- Andre, M., Behlke, R., Wahlund, J.E., Vaivads, A., Eriksson, A., Tjulin, A., Carozzi, T. D., Cully, C., Gustafsson, G., Sundkvist, D., Khotyaintsev, Y., Cornilleau-Wehrlin, N., Rezeau, L., Maksimovic, M., Lucek, E., Balogh, A., Dunlop, M., Lindqvist, P.A.
(författare)
-
Multi-spacecraft observations of broadband waves near the lower hybrid frequency at the Earthward edge of the magnetopause.
- 2001
-
Ingår i: Annales Geophysicae. ; 19:6, s. 1471-1481
-
Tidskriftsartikel (refereegranskat)abstract
- Broadband waves around the lower hybrid frequency (around 10 Hz) near the magnetopause are studied, using the four Cluster satellites. These waves are common at the Earthward edge of the boundary layer, consistent with earlier observations, and can have a
|
|
| 2. |
- Andre, M., et al.
(författare)
-
Multi-spacecraft observations of broadband waves near the lower hybrid frequency at the Earthward edge of the magnetopause
- 2001
-
Ingår i: Annales Geophysicae. - : Copernicus GmbH. - 0992-7689 .- 1432-0576. ; 19:12-okt, s. 1471-1481
-
Tidskriftsartikel (refereegranskat)abstract
- Broadband waves around the lower hybrid frequency (around 10 Hz) near the magnetopause are studied, using the four Cluster satellites. These waves are common at the Earthward edge of the boundary layer, consistent with earlier observations, and can have amplitudes at least up to 5 mV/m. These waves are similar on all four Cluster satellites, i.e. they are likely to be distributed over large areas of the boundary. The strongest electric fields occur during a few seconds, i.e. over distances of a few hundred km in the frame of the moving magnetopause, a scale length comparable to the ion gyroradius. The strongest magnetic oscillations in the same frequency range are typically found in the boundary layer, and across the magnetopause. During an event studied in detail, the magnetopause velocity is consistent with a large-scale depression wave, i.e. an inward bulge of magnetosheath plasma, moving tailward along the nominal magnetopause boundary. Preliminary investigations indicate that a rather flat front side of the large-scale wave is associated with a rather static small-scale electric field, while a more turbulent backside of the large-scale wave is associated with small-scale time varying electric field wave packets.
|
|
| 3. |
- Berthomier, M, et al.
(författare)
-
Electron-acoustic solitons in an electron-beam plasma system
- 2000
-
Ingår i: PHYSICS OF PLASMAS. - : AMER INST PHYSICS. - 1070-664X. ; 7:7, s. 2987-2994
-
Tidskriftsartikel (övrigt vetenskapligt/konstnärligt)abstract
- Electron-acoustic solitons exist in a two electron temperature plasma (with "cold" and "hot" electrons) and take the form of negative electrostatic potential pulses. They develop on a spatial scale of a few Debye lengths and propagate at the electron-acou
|
|
| 4. |
- Gustafsson, Georg, et al.
(författare)
-
First results of electric field and density observations by Cluster EFW based on initial months of operation
- 2001
-
Ingår i: Annales Geophysicae. - : Copernicus GmbH. - 0992-7689 .- 1432-0576. ; 19:12-okt, s. 1219-1240
-
Tidskriftsartikel (refereegranskat)abstract
- Highlights are presented from studies of the electric field data from various regions along the CLUSTER orbit. They all point towards a very high coherence for phenomena recorded on four spacecraft that are separated by a few hundred kilometers for structures over the whole range of apparent frequencies from I mHz to 9 kHz. This presents completely new opportunities to study spatial-temporal plasma phenomena from the magnetosphere out to the solar wind. A new probe environment was constructed for the CLUSTER electric field experiment that now produces data of unprecedented quality. Determination of plasma flow in the solar wind is an example of the capability of the instrument.
|
|
| 5. |
|
|
| 6. |
- Ivchenko, Nickolay, et al.
(författare)
-
Inertial Alfven Waves in the Ionosphere : Theoretical Considerations and Experimental Constraints
- 2000
-
Ingår i: in Waves in Dusty, Solar and Space Plasmas, ed. F. Verheest, M. Goossens, M. A. Hellberg, and R. Bharuthram, AIP Conf. Proc., Melville, New York. - : AIP. ; 537, s. 356-363
-
Tidskriftsartikel (refereegranskat)abstract
- Perturbations of electric and magnetic fields with periods of the order of 1 second are commonly observed in the auroral region by satellites and sounding rockets. The events are often accompanied by magnetic field aligned electron precipitation. The observations have been interpreted as inertial Alfvén mode waves. A variety of theories, some of which are surveyed here, have been suggested to describe such events. Recent observations of Alfvénic activity by sounding rockets and satellites are presented and their implications for the theoretical models are discussed.
|
|
| 7. |
- Khotyaintsev, Y., et al.
(författare)
-
Electron energization by Alfven waves : Freja and sounding rocket observations
- 2000
-
Ingår i: Physica scripta. T. - 0281-1847. ; T84, s. 151-153
-
Tidskriftsartikel (refereegranskat)abstract
- Recent sounding rockets observations highlight some space-time ambiguities in phenomena taking place in the auroral ionosphere, previously observed by the Freja spacecraft. Field aligned electron populations with energies from a few tens of eV to a few keV streaming through cold background plasma are usually observed in the auroral zone in association with strongly nonlinear electromagnetic perturbations. Simultaneous observations of bursty Langmuir emissions indicate the unstable character of these plasma distributions. A detailed analysis shows that the electromagnetic perturbations take the form of quasi-stationary nonlinear spatial structures related to inertial Alfven waves. We suggest that inhomogeneous altitude distribution of the parallel electric field of these structures due to ionospheric density gradientis responsible for the observed electron distributions.
|
|
| 8. |
- Khotyaintsev, Y, et al.
(författare)
-
Electron Energization by Alfvén Waves: Freja and Sounding Rocket Observations
- 2000
-
Ingår i: Physica Scripta. - 0281-1847. ; T84, s. 151-
-
Tidskriftsartikel (refereegranskat)abstract
- An alternative form of the nonrelativistic permittivity tensor for a homogeneous magnetized plasma in thermal equilibrium is derived in the linear approximation. The derivation follows the lines of Trubnikov's derivation of the relativistic permittivity t
|
|
| 9. |
- Khotyaintsev, Y, et al.
(författare)
-
Langmuir wave structures registered by FREJA: Analysis and modeling.
- 2001
-
Ingår i: Advances in Space Research. ; 28:11, s. 1649-1654
-
Tidskriftsartikel (refereegranskat)abstract
- A large set of observations of Langmuir emissions generated by super-thermal electron beams in the topside polar ionosphere has been obtained during the recent FREJA mission. Langmuir emissions appeared as a chain of strongly modulated wave packets; in ma
|
|
| 10. |
|
|
