Search Publications
The relationship between sawtooth events and O+ in the plasma sheet
Dandouras, I.; Klecker, B.; Kistler, L. M. +4 more
In order to study the relationship between sawtooth events and the composition of the plasma sheet, we perform a superposed epoch analysis (SEA) of the O+ concentration inside the near-Earth plasma sheet during sawtooth events and substorms sorted by different geomagnetic storm phases, using Cluster/Composition Distribution Function dat…
Turbulence in the Earth's cusp region: The k-filtering analysis
Dunlop, Malcolm; Cao, Jin-Bin; Fu, Huishan +2 more
On 13 April 2002, four Cluster spacecraft with separations up to 127 km measured similar turbulence in the exterior cusp during northward interplanetary magnetic field (IMF) Bz. Both the power spectra of magnetic and electric field fluctuations resemble the classical Kolmogorov power law, with the scaling f-1.7 under the prot…
An empirical model for the plasma environment along Titan's orbit based on Cassini plasma observations
Rymer, Abigail M.; Smith, H. Todd
Prior to Cassini's arrival at Saturn, the nitrogen-rich dense atmosphere of Titan was considered as a significant, if not dominant, source of heavy ions in Saturn's magnetosphere. While nitrogen was detected in Saturn's magnetosphere based on Cassini observations, Enceladus instead of Titan appears to be the primary source. However, it is difficul…
Numerical simulation of the effects of meteoroid ablation and solar EUV/X-ray radiation in the dayside ionosphere of Mars: MGS/MEX observations
Haider, S. A.; Pandya, B. M.
We have developed a model which produces three plasma layers simultaneously due to the impact of the meteoroids, solar X-ray (0.5-9 nm), and EUV (9-102.6 nm) radiation at altitude range 75-85 km, 100-115 km, and 135-140 km, respectively, in the dayside ionosphere of Mars. The calculated results are compared with the radio occultation measurements …
How to distinguish between kink and sausage modes in flapping oscillations?
Kubyshkin, I. V.; Sergeev, V. A.; Semenov, V. S. +5 more
Flapping waves are most noticeable large-scale perturbations of the magnetotail current sheet, whose nature is still under discussion. They represent rather slow (an order of magnitude less than typical Alfven speed) waves propagating from the center of the sheet to its flanks with a typical speed of 20-60 km/s, amplitude of 1-2 Re and …
Dust charging in the Enceladus torus
Yaroshenko, V. V.; Lühr, H.; Miloch, W. J.
Employing the parameter space, consistent with available Cassini data, dust charging is studied in the near-Enceladus plasma with special focus on the region close to the moon's plume. The emphasis is on the role of dust size distribution and grain density, the electron temperature, fraction of the hot electrons, and multi-ion composition includin…
Random dust charge fluctuations in the near-Enceladus plasma
Yaroshenko, V. V.; Lühr, H.
Stochastic dust charge fluctuations have been studied in the light of Cassini data on the near-Enceladus plasma environment. Estimates of fluctuation time scales showed that this process can be of importance for the grains emanating from the icy moon. The analytical modeling predicts that in the dust-loaded Enceladus plasma a majority of the grain…
Structure of a reconnection layer poleward of the cusp: Extreme density asymmetry and a guide field
Russell, C. T.; Farrugia, C. J.; Torbert, R. B. +7 more
We present Polar observations of a reconnection layer during an inbound pass at high northern latitudes. The interplanetary field of 20 nT pointed strongly northward continuously for 13 h. Reverse polar cap convection observed repeatedly by the DMSP F13 satellite provided direct evidence of continued reconnection. Polar observed sunward and southw…
Reconstruction of an evolving magnetic flux rope in the solar wind: Decomposing spatial and temporal variations from single-spacecraft data
Hasegawa, Hiroshi; Hu, Qiang; Sonnerup, Bengt U. Ö. +1 more
We present a novel single-spacecraft method for decomposing spatial and temporal variations of physical quantities at points along the path of a spacecraft in space-time. The method is designed for use in the reconstruction of evolving two-dimensional, approximately magnetohydrostatic structures in a space plasma. It is an extension of the one dev…
Suprathermal magnetospheric minor ions heavier than water at Saturn: Discovery of 28M+ seasonal variations
Krimigis, S. M.; Mitchell, D. G.; Hamilton, D. C. +2 more
Water group ions W+ (O+, OH+, H2O+, and H3O+), along with H+ and H2+, dominate Saturn's near-equatorial magnetospheric suprathermal ion populations. The singly charged, minor heavy ions O2+ and 28M+