Search Publications
A structural study of an interior layered deposit in southwestern Candor Chasma, Valles Marineris, Mars, using high resolution stereo camera data from Mars Express
Scholten, F.; Neukum, G.; Hauber, E. +5 more
An interior layered deposit (ILD) within Western Candor Chasma of Valles Marineris, Mars, is examined using data from the High Resolution Stereo Camera of the Mars Express mission. Most ILD layers dip in the same direction as the topographic slope. Exposed, rotated fault blocks of basement lithology appear to penetrate the cover of this ILD deposi…
Temporal evolution of a staircase ion signature observed by Cluster in the mid-altitude polar cusp
Berchem, J.; Escoubet, C. P.; Pitout, F. +9 more
We use the Cluster string of pearls configuration to investigate temporal variations of ion precipitation in the mid-altitude polar cusp. On 7 Aug. 2004, Cluster 4 was moving poleward through the Northern cusp, followed by Cluster 1, Cluster 2, and finally Cluster 3. The Wind spacecraft detected a Southward turning of the Interplanetary Magnetic F…
Cluster observations of broadband electromagnetic waves in and around a reconnection region in the Earth's magnetotail current sheet
Walsh, A. P.; Freeman, M. P.; Petkaki, P.
We present an analysis of the electric and magnetic wave spectra on kinetic scales during several crossings of a reconnecting current sheet. The spectra were measured from 1 Hz or less up to 4096 Hz by the EFW, FGM and STAFF instruments onboard the Cluster spacecraft between 3 and 4 UT on 11 October 2001. During the event plasma flows of order of …
Spatial gradients in the plasmasphere from Cluster
Dunlop, M. W.; Décréau, P. M. E.; De Keyser, J. +2 more
The Cluster mission allows the study of the plasmasphere with four-point measurements, including its overall density distribution, plasmaspheric plumes close to the plasmapause, and density irregularities inside the plasmasphere. The purpose of this letter is to examine the geometry and orientation of the overall density structure and of the magne…
A test-particle model of the atmosphere/ionosphere system of Saturn's main rings
Tokar, R. L.; Johnson, R. E.; Young, D. T. +4 more
The first pass of the Cassini orbiter near the A and B rings of Saturn, formed mainly by H2O ice particles, revealed the presence of an ionosphere composed of O+ and O2+ ions. Such a result suggests the existence of an atmospheric halo made up of molecular oxygen surrounding the rings. It is produced by …
Multiplet structure of acceleration processes in the distant magnetotail
Zelenyi, L. M.; Sauvaud, J. -A.; Grigorenko, E. E. +1 more
We have studied ion distributions measured in the Plasma Sheet Boundary Layer (PSBL) of the Earth's magnetotail by the Cluster spacecraft at X ~ -15Re. Field-aligned ion beams (beamlets) accelerated in the magnetotail to energies of ~30keV are typically observed within the interface region between the Plasma Sheet (PS) and the magnetotail lobes. P…
Response of the mid-altitude cusp to rapid rotations of the IMF
Escoubet, C. P.; Pitout, F.; Fazakerley, A. N. +3 more
On 12 August 2003, the four Cluster spacecraft crossed the mid-altitude cusp one after the other a minute or two apart. Shortly after the cusp crossing, two of the Cluster observed three structures poleward of the cusp that appeared and grew in successive satellite passes. In these structures, high fluxes of low-energy magnetosheath-like ions and …
CLUSTER observation of collisionless transport at the magnetopause
Fränz, M.; Dandouras, I.; Rème, H. +5 more
On May 10, 2002 the CLUSTER spacecraft (SC) encountered a ~450 km (five magnetosheath thermal proton gyro-radii) wide high-latitude magnetopause (MP). Magnetic field observations indicate the crossing of a ~130 km thick MP current sheet (CS) located inside a magnetic hole. Proton flux measurements diagnose a dense boundary layer (BL) directly atta…
Remote sensing of a magnetotail reconnection X-line using polar rain electrons
Lucek, E.; Owen, C. J.; Sergeev, V. +3 more
We report on electron phase space distributions (PSDs) observed near the plasma sheet (PS) boundary layer (PSBL) by the Cluster electron spectrometers when the northern lobe was occupied by significant fluxes of polar rain (PR) electrons. These observations reveal the spatial structure of the electron transition layer (TL) between the polar rain e…
Comment on ``Estimated solar contribution to the global surface warming using the ACRIM TSI satellite composite'' by N. Scafetta and B. J. West
Lean, Judith L.
Abstract Available from http://www.agu.org