Search Publications
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…
Location and size of the global source region of whistler mode chorus
Santolík, O.; Parrot, M.; Hayosh, M.
We use multicomponent measurements of the four Cluster spacecraft and a backward ray tracing simulation to estimate the location and size of the global source of whistler mode chorus emissions in the magnetic equatorial plane. For the first time, analysis is made in a broad range of latitudes in both hemispheres along a single Cluster orbit. Our r…
What can be learned from the absence of auroral X-ray emission from Saturn?
Cravens, Thomas E.; Hui, Yawei; Schultz, David R. +1 more
To understand the origin and magnitude of the present upper limit observations of Saturn's auroral X-ray emission, we use simple models based on the mechanism that leads to analogous emission at Jupiter, charge transfer between ion precipitation and atmospheric gas. Several putative sources and characteristics of the precipitation are considered, …
Simultaneous FAST and Double Star TC1 observations of broadband electrons during a storm time substorm
Dandouras, I.; Fazakerley, A. N.; Le Contel, O. +13 more
Broadband electrons (BBEs) exhibit remarkable electron flux enhancements over a broad energy range (0.03-30 keV) near the equatorward edge of the auroral oval during geomagnetic storms. Here, we report a BBE event observed by the Fast Auroral Snapshot (FAST) satellite at 1355-1359 UT, ∼61°-66° invariant latitudes, ∼0600 magnetic local time (MLT), …
Characteristics of storm time electric fields in the inner magnetosphere derived from Cluster data
Farrugia, C. J.; Khotyaintsev, Yu. V.; Torbert, R. B. +6 more
Storm-time electric fields in the inner magnetosphere measured by Cluster are reported in this study. First, we show two events around the time when Dst index is at a minimum. The electric field possibly related to subauroral ion drifts and/or undershielding is measured inside the inner edge of the electron plasma sheet in the eveningside. For the…