Search Publications
An empirical relationship between coronal mass ejection initial speed and solar wind dynamic pressure
Cho, K. -S.; Kim, K. -H.; Moon, Y. -J. +3 more
Interplanetary shocks that precede coronal mass ejections (CMEs) are mainly responsible for sudden impulses, which are characterized by a simple step-like increase in the horizontal H component. Such a magnetic field change has been explained as a compression of the magnetosphere by the passage of a sudden increase in the solar wind dynamic pressu…
On the multispacecraft determination of periodic surface wave phase speeds and wavelengths
Farrugia, C. J.; Fazakerley, A. N.; Owen, C. J. +3 more
Observations of surface waves on the magnetopause indicate a wide range of phase velocities and wavelengths. Their multispacecraft analysis allows a more precise determination of wave characteristics than ever before and reveal shortcomings of approximations to the phase speed that take a predetermined fraction of the magnetosheath speed or the av…
Observations and simulations of a highly structured plasma sheet during northward IMF
El-Alaoui, Mostafa; Ashour-Abdalla, Maha; Walker, Raymond +2 more
We investigated a highly structured plasma sheet populated by counterstreaming beams observed by the Cluster and Double Star spacecraft on October 10, 2005, during an extended interval of northward interplanetary magnetic field (IMF). We used Wind spacecraft observations as input into our global magnetohydrodynamic (MHD) simulation of the event, a…
A series of plasma flow vortices in the tail plasma sheet associated with solar wind pressure enhancement
Shi, Q. Q.; Fu, S. Y.; Pu, Z. Y. +3 more
A series of earthward-moving (∼140 km/s) plasma flow vortices with anticlockwise (when viewed from above the ecliptic plane) rotation was detected in the dawnside tail plasma sheet between 1255 and 1400 UT on 6 July 2003. These flow vortices were observed under the condition of northward interplanetary magnetic field with an enhanced solar wind dy…
Influence of the electric field perpendicular to the current sheet on ion beamlets in the magnetotail
Zimbardo, G.; Greco, A.; Dolgonosov, M. S.
Several studies, both experimental, analytical, and numerical, show that a substantial electrostatic field Ez perpendicular to the magnetotail current sheet can be found. This electric field has a typical bipolar structure. We propose a theoretical analysis describing the ion behavior in the vicinity of the current sheet under the influ…
Asymmetry in the bipolar signatures of flux transfer events
Milan, S. E.; Fear, R. C.; Raeder, J. +1 more
Several conceptual models have been proposed for the formation of flux transfer events (FTEs), including models based on reconnection at a single reconnection line (X line) and at multiple X lines. Two-dimensional magnetohydrodynamic models have previously been used to simulate both scenarios and have found a tendency for FTEs generated by single …
Electron-impact excitation heating rates in the atmosphere of Titan
Campbell, L.; Kato, H.; Brunger, M. J. +1 more
A previous study of various heating rates in the atmosphere of Titan included electron-impact excitation of molecular nitrogen as one component. This work examines this component in more detail, using a statistical equilibrium calculation to avoid approximations made in the earlier work. The sensitivity of the results to different cross-section se…
Features of electron current layers: Comparison between three-dimensional particle-in-cell simulations and Cluster observations
Singh, Nagendra; Yeladandi, Manish; Somarothu, Trinath +1 more
Wygant et al. (2005) and more recently Chen et al. (2008) reported Cluster observations on some basic features of electron current layers (ECL) in the magnetotail. These features include (1) a bifurcated ECL consisting of two layers with relatively large currents separated by a region of small current, (2) peaked density at the ECL center bordered…
Propagation of Jovian electron jets in heliospheric flux tube structures
Heber, B.; Kopp, A.; Dunzlaff, P.
We discuss the propagation of magnetic flux tubes of solar origin through the heliosphere up to the orbit of Jupiter and the possibility that Jovian electron jets result from the interaction of these flux tubes with the magnetosphere of Jupiter. In order to do so, we analyze Ulysses observations in the interplanetary medium along the spacecraft's …
Phase relations between energetic neutral atom intensities and kilometric radio emissions at Saturn
Gurnett, D. A.; Krimigis, S. M.; Kurth, W. S. +2 more
The intensities of energetic neutral atoms (ENAs) from Saturn's ring current were cross-correlated with Saturn kilometric radiation (SKR, 100-400 kHz) to determine their phase relations. The cross correlations were obtained for three intervals in early 2007 when Cassini was at high northern latitudes and the Ion and Neutral Camera (INCA) could opt…