Search Publications
Pickup ions at Dione and Enceladus: Cassini Plasma Spectrometer simulations
Crary, F.; Johnson, R. E.; Young, D. T. +5 more
Voyager images of the icy satellites of Saturn, Dione and Enceladus, suggest that they may have been geologically active and are not only composed of ice. Recent observations by the Hubble Space Telescope have shown the presence of ozone at both Dione and Rhea, which also implies the presence of molecular oxygen at these bodies. Observations of Ar…
Flow burst-induced large-scale plasma sheet oscillation
Balogh, A.; Glassmeier, K. -H.; RèMe, H. +7 more
On 12 August 2001 the Cluster spacecraft measured a rapid flux transport event, consisting of a strong perpendicular earthward flow burst combined with a dipolarization of the magnetic field after a strong compression of the magnetotail. Combining the Cluster data with those from ground-based magnetometers, we find that this event is related to pa…
On the propagation of low-frequency fluctuations in the plasma sheet: 1. Cluster observations and magnetohydrodynamic analysis
Budnik, E.; Balogh, A.; Lucek, E. +6 more
Low-frequency pressure and magnetic oscillations observed by Cluster in the plasma sheet are investigated with the aim of determining if they are magnetohydrodynamic (MHD) eigenmodes. We analyze the plasma sheet crossing occurring on 22 August 2001, as the magnetosphere was first quiet and then active, and compare the observations with theoretical…
On the propagation of low-frequency fluctuations in the plasma sheet: 2. Characterization of the MHD eigenmodes and physical implications
Budnik, E.; Balogh, A.; Lucek, E. +7 more
In a first analysis of the low-frequency fluctuations observed by Cluster during a crossing of the plasma sheet [, 2004], we identify oscillations that likely correspond to MHD eigenmodes. They are intense (10 nT), have a rather short period (20-25 s), have a wavelength of ∼5 Re, and are observed during an active period that follows a s…
Simultaneous observations of Jovian quasi-periodic radio emissions by the Galileo and Cassini spacecraft
Gurnett, D. A.; Hospodarsky, G. B.; Kurth, W. S. +4 more
The gravity-assist flyby by Cassini of Jupiter on 30 December 2000 and the extended Galileo orbital mission provided a unique opportunity to obtain simultaneous measurements with two spacecraft of many Jovian plasma wave and radio emissions. One of these emissions is Jovian type III radio emissions, also known as Jovian quasi-periodic (QP) emissio…
A study of the electrical charging of the Rosetta orbiter: 1. Numerical model
Berthelier, Jean-Jacques; Roussel, Jean-FrançOis
Charging of spacecraft in terrestrial or planetary ionospheres and magnetospheres is a well-known effect which may have detrimental consequences for in-situ plasma measurements. The case of the Rosetta mission is of particular importance because the expected temperatures of cometary ions and electrons in the inner coma of comet Wirtanen are very l…
Fast solar wind after the rapid acceleration
Breen, A. R.; Tokumaru, M.; Hayashi, K. +3 more
We have studied the radial dependence of the velocity of high-latitude fast solar wind in the heliocentric distance range of 0.13-0.9 AU. For this study a new tomographic analysis method which can evaluate uncertainties was developed to obtain velocity distribution maps on two reference spheres at 0.13 and 0.3 AU using interplanetary scintillation…
Transient reconnection in the cusp during strongly negative IMF By
Farrugia, C. J.; Buchert, S.; Khotyaintsev, Y. +6 more
We investigate transient magnetic reconnection (flux transfer events, FTEs) in the cusp and its ionospheric signatures. We present in situ observations by the Polar spacecraft of multiple impulsive plasma injections and related magnetopause crossings in the outer stagnant cusp of the northern hemisphere. At this time the interplanetary magnetic fi…
Cluster observations in the magnetotail during sudden and quasiperiodic solar wind variations
Balogh, A.; Lucek, E.; Kim, K. -H. +5 more
A clear bipolar (negative/positive) signature in the Ey component was observed by three spacecraft on Cluster in the magnetotail during the passage of a solar wind discontinuity on October 11, 2001 (day 284), which caused a sudden commencement (sc) on the ground. The positive Ey perturbation was accompanied by the northward/d…
Energetic particle sounding of the magnetopause: A contribution by Cluster/RAPID
Zong, Q. -G.; Daly, P. W.; Korth, A. +4 more
In this paper we present new results using Cluster/Research with Adaptive Particle Imaging Detectors (RAPID) energetic particle observations to remotely sound the high-latitude magnetopause in three dimensions. We demonstrate that energetic particle flux variations in the vicinity of the magnetopause (inside the magnetosphere) are mainly modulated…