Search Publications
Observations of polar cap flow channel and plasma sheet flow bursts during substorm expansion
Juusola, L.; PitkäNen, T.; Aikio, A. T.
We present the first simultaneous observations of an enhanced polar cap flow impinging on the nightside polar cap boundary (PCB), two flow bursts in the plasma sheet and a conjugate ionospheric flow burst within the auroral oval. The ionospheric measurements on 3 September 2006 were made by the European Incoherent Scatter (EISCAT) radars and the m…
Structure of Titan's induced magnetosphere under varying background magnetic field conditions: Survey of Cassini magnetometer data from flybys TA-T85
Dougherty, Michele K.; Saur, Joachim; Simon, Sven +4 more
Cassini magnetic field observations between 2004 and 2012 suggest the ambient field conditions near Titan's orbit to differ significantly from the frequently applied pre-Cassini picture (background magnetic field homogeneous and perpendicular to Titan's orbital plane, stationary upstream conditions). In this study, we analyze the impact of these v…
Current sheet structure and kinetic properties of plasma flows during a near-Earth magnetic reconnection under the presence of a guide field
Malova, H. V.; Zelenyi, L. M.; Sauvaud, J. -A. +8 more
Fortunate positioning of Cluster and TC-1 in the plasma sheet (PS) of the Earth's magnetotail has allowed studies of the current sheet (CS) structure and particle dynamics in mesoscale and microscale in both sides of the near-Earth reconnection, which took place between 03:42 and 03:55 UT on 22 September 2004. The distinctive feature of this event…
Hot and cold ion outflow: Observations and implications for numerical models
Nilsson, H.; Slapak, R.; André, M. +2 more
<title type="main">Abstract<p label="1">Cluster observations of oxygen ion outflow and low-frequency waves at high altitude above the polar cap and cold ion outflow in the lobes are used to determine ion heating rates and low-altitude boundary conditions suitable for use in numerical models of ion outflow. Using our results, it is poss…
Relations of the energetic proton fluxes in the central plasma sheet with solar wind and geomagnetic activities
Duan, Aiying; Cao, Jinbin; Reme, Henri +1 more
this paper, using 9 years of Cluster data, we statistically investigate the relations of central plasma sheet energetic proton fluxes, ~30 keV to 380 keV, with the solar wind parameters and geomagnetic indexes. The energetic proton fluxes increase with increasing solar wind dynamical pressure and solar wind speed. The energetic proton fluxes are m…
Links between the plasmapause and the radiation belt boundaries as observed by the instruments CIS, RAPID, and WHISPER onboard Cluster
Cabrera, J.; Lointier, G.; Pierrard, V. +5 more
In the present work, we study the relations between the position of the plasmapause and the position of the radiation belt boundaries. The Cluster mission offers the exceptional opportunity to analyze those different regions of the inner magnetosphere with identical sensors on multiple spacecraft. We compare the positions of the radiation belt edg…
Heliolatitudinal and time variations of the solar wind mass flux: Inferences from the backscattered solar Lyman-alpha intensity maps
Quemerais, E.; Sokół, J. M.; Katushkina, O. A. +1 more
Recently Sokół et al. (2012) have presented a reconstruction of heliolatitudinal and time variations of the solar wind speed and density. Method of the reconstruction was based on the following: (i) measurements of the interplanetary scintillations, (ii) OMNI-2 solar wind data in the ecliptic plane, and (iii) Ulysses solar wind data out of the ecl…
The extended Saturnian neutral cloud as revealed by global ENA simulations using Cassini/MIMI measurements
Krupp, N.; Krimigis, S. M.; Mitchell, D. G. +4 more
We show that the neutral gas vertical distribution at Saturn must be ~3-4 times more extended than previously thought for the >5 RSregions, while the neutral H distribution is consistent with H densities that reach up to ~150/cm3close to the orbit of Titan. We utilize a technique to retrieve the global neutral gas distribu…
Electron demagnetization and heating in quasi-perpendicular shocks
Mozer, F. S.; Sundkvist, D.
Field and plasma measurements made during a quasi-perpendicular terrestrial bow shock crossing by the Time History of Events and Macroscale Interactions during Substorms (THEMIS) E spacecraft on 21 August 2010 show that the measured electric field, being as great as 300 mV/m in the ramp, produced potential fluctuations over an electron gyrodiamete…
Empirical reconstruction of storm time steady magnetospheric convection events
Anderson, B. J.; McPherron, R. L.; Sitnov, M. I. +4 more
We investigate the storm-scale morphology of the magnetospheric magnetic field as well as underlying distributions of electric currents, equatorial plasma pressure, and entropy for four steady magnetospheric convection (SMC) events that occurred during the May 2000 and October 2011 magnetic storms. The analysis is made using the empirical geomagne…