Search Publications
Unusual electron density profiles observed by Cassini radio occultations in Titan's ionosphere: Effects of enhanced magnetospheric electron precipitation?
Cravens, T. E.; Rymer, A. M.; Richard, M. S. +2 more
The Cassini radio science facility provided 13 occultation electron density profiles of Titan during the period of 2006 and 2009. This paper presents the results of all of these occultation observations. It shows that ten of the observed electron density profiles are similar, but three are significantly different. The number of observations is rel…
Evidence of the origin of the Hall magnetic field for reconnection: Hall MHD reconstruction results from Cluster observations
Eastwood, J. P.; Fazakerley, A. N.; Nakamura, R. +4 more
Using reconstruction results from Cluster observations in the magnetotail, we present observational evidence for the electron-current loops responsible for generating the out-of-plane Hall magnetic field during reconnection. This reconstruction is the first successful application to actual spacecraft data of a newly developed reconstruction techni…
“Crater” flux transfer events: Highroad to the X line?
Farrugia, C. J.; Lucek, E.; André, M. +12 more
We examine Cluster observations of a so-called magnetosphere “crater FTE,” employing data from five instruments (FGM, CIS, EDI, EFW, and WHISPER), some at the highest resolution. The aim of doing this is to deepen our understanding of the reconnection nature of these events by applying recent advances in the theory of collisionless reconnection an…
Nonlinear force-free field extrapolation of the coronal magnetic field using the data obtained by the Hinode satellite
Yan, Yihua; Wang, Huaning; He, Han
The Hinode satellite can obtain high-quality photospheric vector magnetograms of solar active regions and the simultaneous coronal loop images in soft X-ray and extreme ultraviolet (EUV) bands. In this paper, we continue the work of He and Wang (2008) and apply the newly developed upward boundary integration computational scheme for the nonlinear …
TC-1 observations of a flux rope: Generation by multiple X line reconnection
Rème, H.; Cao, J. B.; Carr, C. M. +2 more
On 29 December 2004 the Double Star TC-1 satellite most probably stays close to a reconnection line for about 20 min. The direction of the X line can be evaluated according to the component merging model. During the time of observations, TC-1 also detects a flux transfer event (FTE). It is found that the FTE axis is parallel to such an X line. Thi…
Comparison between Cassini and Voyager observations of Jupiter's decametric and hectometric radio emissions
Imai, Masafumi; Imai, Kazumasa; Higgins, Charles A. +1 more
In this paper, we attempt to clarify the relationship between Jovian hectometric (HOM) and non-Io-related decametric (non-Io-DAM) radio structure. For that purpose, we extend the analysis by including more data and investigating statistical properties of the Jovian DAM and HOM radio emissions based on Cassini and Voyager observations, especially b…
Detection of currents and associated electric fields in Titan's ionosphere from Cassini data
Lewis, G. R.; Coates, A. J.; Dougherty, M. K. +13 more
We present observations from three Cassini flybys of Titan using data from the radio and plasma wave science, magnetometer and plasma spectrometer instruments. We combine magnetic field and cold plasma measurements with calculated conductivities and conclude that there are currents of the order of 10 to 100 nA m-2 flowing in the ionosph…
Cassini dust stream particle measurements during the first three orbits at Saturn
Kempf, S.; Postberg, F.; Srama, R. +5 more
Stream particles are nanometer-scale dust particles ejected with speeds $\gtrsim$100 km s-1 from both the Jovian and Saturnian systems. Here we report the dynamical analysis of Saturnian stream particles on the basis of observations made by the Cosmic Dust Analyzer on board the Cassini spacecraft during its first three orbits around Sat…
Spatiotemporal features of the auroral acceleration region as observed by Cluster
Karlsson, Tomas; Fazakerley, Andrew; Nilsson, Hans +5 more
A pair of negative electric potential structures associated with inverted-V aurora is investigated using electric and magnetic field, ion and electron data from the Cluster spacecraft, crossing the auroral acceleration region (AAR) at different altitudes above the Northern hemisphere midnight auroral oval. The spatial and temporal development of t…
Propagation of a shock-related disturbance in the Earth's magnetosphere
Santolík, O.; Palmroth, M.; Pulkkinen, T. I. +2 more
The Grand Unified Magnetosphere-Ionosphere Coupling Simulation, version 4, magnetohydrodynamic simulation of the interplanetary shock event on 9 November 2002 is used to determine the shock-associated disturbance propagation characteristics inside the Earth's magnetosphere. Interaction of an interplanetary fast forward shock with the magnetopause …