Search Publications
In situ magnetotail magnetic flux calculation
Gordeev, E.; Shukhtina, M. A.
We explore two new modifications of the magnetotail magnetic flux (F) calculation algorithm based on the Petrinec and Russell (1996) (PR96) approach of the tail radius determination. Unlike in the PR96 model, the tail radius value is calculated at each time step based on simultaneous magnetotail and solar wind observations. Our former algorithm, d…
Adaptation of the de Hoffmann-Teller frame for quasi-perpendicular collisionless shocks
Narita, Y.; Motschmann, U.; Comişel, H.
The concept of the de Hoffmann-Teller frame is revisited for a high Mach-number quasi-perpendicular collisionless shock wave. Particle-in-cell simulation shows that the local magnetic field oscillations in the shock layer introduce a residual motional electric field in the de Hoffmann-Teller frame, which is misleading in that one may interpret tha…
Wide-banded NTC radiation: local to remote observations by the four Cluster satellites
Rauch, J. -L.; Décréau, P. M. E.; Canu, P. +7 more
The Cluster multi-point mission offers a unique collection of non-thermal continuum (NTC) radio waves observed in the 2-80 kHz frequency range over almost 15 years, from various view points over the radiating plasmasphere. Here we present rather infrequent case events, such as when primary electrostatic sources of such waves are embedded within th…
Physics of outflows near solar active regions
Price, D. J.; Taroyan, Y.
Hinode/EIS observations have revealed outflows near active regions which remain unexplained. An outflow region observed by the EUV Imaging Spectrometer (EIS) that appears slightly redshifted at low temperatures and blueshifted at higher temperatures is presented. We conduct simulations and use those to create synthetic line profiles in order to re…
Comparisons of electron acceleration efficiency among different structures during magnetic reconnection: a Cluster multicase study
Li, H.; Zhou, M.; Li, T. +2 more
Magnetic reconnection has long been believed to be an efficient engine for energetic electrons production. Four different structures have been proposed for electrons being energized: flux pileup region, density cavity located around the separatrix, magnetic island and thin current sheet. In this paper, we compare the electron acceleration efficien…
Self-consistent electrostatic simulations of reforming double layers in the downward current region of the aurora
Gunell, H.; Andersson, L.; De Keyser, J. +1 more
The plasma on a magnetic field line in the downward current region of the aurora is simulated using a Vlasov model. It is found that an electric field parallel to the magnetic fields is supported by a double layer moving toward higher altitude. The double layer accelerates electrons upward, and these electrons give rise to plasma waves and electro…
Relating field-aligned beams to inverted-V structures and visible auroras
Dandouras, I.; Rème, H.; Parks, G. K. +5 more
The ion composition experiment on Cluster measures 3-D distributions in one spin of the spacecraft (4 s). These distributions often measure field-aligned ion beams (H+, He+ and O+) accelerated out of the ionosphere. The standard model of these beams relies on a quasi-static U-shaped potential model. The beams conta…
Dawn-dusk asymmetries in the coupled solar wind-magnetosphere-ionosphere system: a review
Wing, S.; Haaland, S.; Soucek, J. +8 more
Dawn-dusk asymmetries are ubiquitous features of the coupled solar-wind-magnetosphere-ionosphere system. During the last decades, increasing availability of satellite and ground-based measurements has made it possible to study these phenomena in more detail. Numerous publications have documented the existence of persistent asymmetries in processes…
Waves in high-speed plasmoids in the magnetosheath and at the magnetopause
Gunell, H.; Dandouras, I.; Nilsson, H. +9 more
Plasmoids, defined here as plasma entities with a higher anti-sunward velocity component than the surrounding plasma, have been observed in the magnetosheath in recent years. During the month of March 2007 the Cluster spacecraft crossed the magnetopause near the subsolar point 13 times. Plasmoids with larger velocities than the surrounding magneto…
Mirror mode structures near Venus and Comet P/Halley
Zhang, T. L.; Baumjohann, W.; Volwerk, M. +4 more
In this paper, we study where mirror mode structures are generated near unmagnetized solar system bodies (Venus and comet P/Halley measured in situ by Venus Express and Giotto). To estimate the location of the mirror mode source region at Venus, we apply a turbulent diffusion model of mirror mode structures, which has already been successfully tes…