Search Publications
Multispacecraft and ground-based observations of substorm timing and activations: Two case studies
Escoubet, C. P.; Dandouras, I.; Zhang, H. +23 more
Two case studies are performed to investigate substorm timing and activations based on Double Star TC1, Cluster, Polar, IMAGE, LANL geostationary satellites and ground-based geomagnetic field measurements. In both events, an earthward flow associated with plasma sheet thinning is measured by Cluster 8-10 min ahead of the auroral breakup. A couple …
Current carriers in the bifurcated tail current sheet: Ions or electrons?
Israelevich, P. L.; Ershkovich, A. I.; Oran, R.
We have studied statistical distributions of the current density in the geomagnetic tail current sheet for different sets of local plasma parameters using Cluster data. It is shown that the electric current density calculated from 4-point magnetic field measurements exhibits no correlation with the number flux of ions. We conclude that main curren…
The reconnection site of temporal cusp structures
Escoubet, C. P.; Yeoman, T. K.; Fuselier, S. A. +3 more
The strong precipitating particle flux in the cusp regions is the consequence of magnetic reconnection between the interplanetary magnetic field and the geomagnetic field. Magnetic reconnection is thought to be the dominant process for mass, energy, and momentum transfer from the magnetosheath into the magnetosphere. Observations of downward preci…
Ultra-low-frequency waves and associated wave vectors observed in the plasma sheet boundary layer by Cluster
Glassmeier, K. -H.; RèMe, H.; Keiling, A. +5 more
Waves in the Pc1-Pc2 frequency range (0.1-5 Hz) are studied using Cluster magnetic field data. In the plasma sheet boundary layer, Cluster observed harmonically related waves with the fundamental near the local proton cyclotron frequency (Ωp). These waves had components both parallel and perpendicular to the local magnetic field (B…
MHD simulations of the global solar corona around the Halloween event in 2003 using the synchronic frame format of the solar photospheric magnetic field
Liu, Yang; Hayashi, Keiji; Zhao, Xue Pu
We performed two time-relaxation magnetohydrodynamics (MHD) simulations of the solar corona: one uses the boundary map representing the solar surface magnetic field distribution before the Halloween event in 2003, and the other uses map representing the postevent distribution. The aims of this study are to test a new concept of a solar surface mag…
Predicting interplanetary shock arrivals at Earth, Mars, and Venus: A real-time modeling experiment following the solar flares of 5-14 December 2006
Barabash, S.; Lundin, R.; Futaana, Y. +12 more
A 3-D, kinematic, solar wind model (Hakamada-Akasofu-Fry version 2 (HAFv.2)) is used to predict interplanetary shock arrivals at Venus, Earth, and Mars during a sequence of significant solar events that occurred in the interval 5-14 December 2006. Mars and Venus were on the opposite side of the Sun from Earth during this period. The shocks from th…
Inversion solutions of the elliptic cone model for disk frontside full halo coronal mass ejections
Zhao, X. P.
A new algorithm is developed for inverting six unknown elliptic cone model parameters from five observed CME halo parameters. It is shown that the halo parameter α includes the information on the coronal mass ejection (CME) propagation direction denoted by two model parameters. On the basis of the given halo parameter α, two approaches are present…
Ionospheric oxygen ions dominant bursty bulk flows: Cluster and Double Star observations
Zhang, H.; Zong, Q. -G.; Daly, P. W. +5 more
Two extreme oxygen-rich bursty bulk flows (BBFs) with predominant ionospheric O+ ions have been observed on 8 November 2004 by the Cluster and Double Star spacecraft during a strong magnetic storm time period with Dst = -373 nT. The oxygen densities in two BBFs are found to be 3-5 times larger than the hydrogen densities and the oxygen …
Observations of a comet tail disruption induced by the passage of a CME
Webb, D. F.; Arge, C. N.; Tappin, S. J. +7 more
The Solar Mass Ejection Imager observed an extremely faint interplanetary coronal mass ejection (ICME) as it passed Comet C/2001 Q4 (NEAT) on 5 May 2004, apparently causing a disruption of its plasma tail. This is the first time that an ICME has been directly observed interacting with a comet. SMEI's nearly all-sky coverage and image cadence affor…
The lower exosphere of Titan: Energetic neutral atoms absorption and imaging
Krupp, N.; Dandouras, I.; Garnier, P. +8 more
The Saturn magnetosphere interacts with the Titan atmosphere through various mechanisms. One of them leads, by charge exchange reactions between the energetic Saturnian ions and the exospheric neutrals of Titan, to the production of energetic neutral atoms (ENAs). The Ion and Neutral Camera (INCA), one of the three sensors that comprise the Magnet…