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Enceladus auroral hiss observations: Implications for electron beam locations
Gurnett, D. A.; Hospodarsky, G. B.; Leisner, J. S.
<title type="main">Abstract<p label="1">The Cassini spacecraft has made 20 close flybys of the icy moon Enceladus between its arrival at Saturn in 2004 and 2012. Of those 20, strong whistler mode emissions (often called auroral hiss) were clearly observed on seven encounters. The propagation paths of these emissions are determined by t…
The turbulence evolution in the high β region of the Earth's foreshock
Yuan, Zhigang; Huang, Shiyong; Zhou, Meng +5 more
In this paper, we study the foreshock turbulence evolution in high β region via both Cluster observation on 29 March 2002 and 1-D hybrid simulation. The quasi-sinusoidal and the irregular wave trains are both detected in this event. The former one is believed to be generated by ion-ion right-hand nonresonant instability due to the right-hand polar…
Ionospheric signatures of a plasma sheet rebound flow during a substorm onset
RèMe, H.; Nakamura, R.; Snekvik, K. +7 more
Magnetic reconnection in Earth's magnetotail produces fast earthward flows in the plasma sheet. Tailward flows are often observed associated with the earthward flows. Both return flow vortices at the flanks of an earthward flow channel and rebound of the earthward flow from the intense dipolar magnetic field of the inner magnetosphere have been sh…
Simultaneous traveling convection vortex events and Pc1 wave bursts at cusp latitudes observed in Arctic Canada and Svalbard
Singer, H. J.; Hartinger, M. D.; Posch, J. L. +5 more
convection vortices (TCVs), which appear in ground magnetometer records at near-cusp latitudes as solitary ~5 mHz pulses, are a signature of dynamical processes in the ion foreshock upstream of the Earth's bow shock that can stimulate transient compressions of the dayside magnetosphere. These compressions can also increase the growth rate of elect…
Three-dimensional multi-fluid simulations of Titan's interaction with Saturn's magnetosphere: Comparisons with Cassini's T55 flyby
Snowden, D.; Winglee, R.
We describe a new multi-fluid model of Titan's interaction with Saturn's magnetosphere that includes finer resolution in Titan's ionosphere, photoionization, electron-impact ionization, dissociative recombination, and ion-neutral coupling in the momentum and energy equations. We compare simulation results to data from Cassini's T55 flyby to show t…
Coherent transmission of upstream waves to polar latitudes through magnetotail lobes
Glassmeier, K. H.; Regi, M.; De Lauretis, M. +2 more
studied the transmission of upstream waves to polar latitudes through the Earth's magnetotail lobes, statistically examining the correspondence between magnetospheric waves detected by Cluster and geomagnetic fluctuations at Dome C, in Antarctica (λ ~ 88.84°S). The analysis was restricted to time intervals when Cluster was in the southern magnetot…
Near-lunar proton velocity distribution explained by electrostatic acceleration
Hutchinson, I. H.
The observation of parallel ion velocity in the near-lunar wake approximately equal to external solar wind velocity can be explained within uncertainties by an analytic electrostatic expansion model. The one-dimensional model frequently used is inadequate because it does not account for the moon's spherical shape. However, application of a more re…
Solar wind-driven plasma fluxes from the Venus ionosphere
Barabash, S.; Lundin, R.; Zhang, T. L. +4 more
conducted with the ASPERA-4 instrument and the magnetometer of the Venus Express spacecraft show that the kinetic pressure of planetary O+ ion fluxes measured in the Venus wake can be significantly larger than the local magnetic pressure, and as a result, those ions are not solely being driven by magnetic forces but also by the kinetic …
Generation of Pi2 pulsations by intermittent earthward propagating dipolarization fronts: An MHD case study
El-Alaoui, M.; Walker, R. J.; Goldstein, M. L. +3 more
Using a global magnetohydrodynamic (MHD) simulation of the magnetosphere during a disturbed interval on 14 September 2004, we have investigated fluctuations in plasma properties of the magnetotail in the Pi2 range and their relationship to dipolarization fronts (DFs). Results from the MHD simulation indicate that this event is a very active interv…
Solar periodicity in energetic ions at Saturn
Mitchell, D. G.; Roelof, E. C.; Carbary, J. F. +1 more
Energetic protons (2.8-78 keV) and water group ions (8.8-78 keV) observed in Saturn's magnetosphere using the Magnetospheric Imaging Instrument/Charge-Energy-Mass Spectrometer instrument from 2005 through 2012 were subjected to a Lomb periodogram analysis with the period window extending from 0.5 to 50 days, and the data constrained to the spatial…