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Solar wind transport into magnetosphere caused by magnetic reconnection at high latitude magnetopause during northward IMF: Cluster-DSP conjunction observations
Lucek, E.; Reme, H.; Dunlop, M. +5 more
An event of Cluster-Double Star conjunction observations of magnetic reconnection at high latitude magnetopause nightside of both cusps and solar wind transport into magnetosphere caused by such reconnection process has been investigated. During northward IMF, Cluster/SC1 observed accelerated flows and ion heating associated with magnetic reconnec…
Optical Morphologies of Millijansky Radio Galaxies Observed by the Hubble Space Telescope and in the Very Large Array FIRST Survey
Ryan, R. E., Jr.; Windhorst, R. A.; Cohen, S. H. +2 more
We report on a statistical study of 51 radio galaxies at the millijansky flux level selected from the Faint Images of the Radio Sky at Twenty cm survey, including their optical morphologies and structure obtained with the Hubble Space Telescope (HST). Our optical imaging is significantly deeper (~2 mag) than previous studies with the superior angu…
a Three-Dimensional Orbit for Capella
Branham, Richard L.
Semidefinite programming is applied to 169 interferometric observations of Capella, made between 1919 and 1999, and 221 double-line radial velocities, obtained between 1896 and 1991, to calculate a three-dimensional orbit. The data are reduced with the robust L 1 criterion. The orbit is nearly circular, eccentricity of 0.00508, with a s…
Plasma sheet oscillations and their relation to substorm development: Cluster and double star TC1 case study
Zhang, T. L.; Klecker, B.; Nakamura, R. +11 more
We examined two consecutive plasma sheet oscillation and dipolarization events observed by Cluster in the magnetotail, which are associated with a pseudo-breakup and a small substorm monitored by the IMAGE spacecraft. Energy input from the solar wind and an associated enhancement of the cross-tail current lead to current sheet thinning and plasma …
Magnetosphere-ionosphere coupling during periods of extended high auroral activity: a case study
Kistler, L. M.; Karlsson, T.; Mouikis, C. +6 more
Results are presented from a case study of a plasma boundary crossing by the Cluster spacecraft during an extended period of high auroral activity. The boundary between the magnetotail lobe region of the Southern Hemisphere and the plasma sheet boundary layer, was characterized by intense electric and magnetic field variations, structured upward a…
Correction to ``Electron density estimations derived from spacecraft potential measurements on Cluster in tenuous plasma regions''
Sauvaud, J. -A.; Dandouras, I.; André, M. +13 more
Evaluation of substorm models with Cluster observations of plasma flow reversal in the magnetotail
Dunlop, M. W.; Rème, H.; Lui, A. T. Y. +2 more
We evaluate two prevailing substorm models with an event of plasma flow reversal from tailward to Earthward detected by Cluster at the downstream distance of ∼19 RE in the magnetotail during a substorm on August 22, 2001. We use the unique capability of Cluster measurements in determining gradients to examine the associated current dens…
Nonlinear dynamics of foreshock structures: Application of nonlinear autoregressive moving average with exogenous inputs model to Cluster data
Dunlop, M. W.; Balikhin, M. A.; Gedalin, M. +6 more
Nonlinear processes identification techniques based on multi-input nonlinear autoregressive moving average with exogenous inputs model has been applied to four-point Cluster measurements in order to study nonlinear processes that take place in the terrestrial foreshock. It is shown that both quadratic and cubic processes are involved in the evolut…
Substorm onset dynamics in the magnetotail as derived from joint TC-1 and Cluster data analysis
Wang, H.; Lühr, H.; Ridley, A. J. +1 more
This study investigates two substorm onset events with favorable constellations of spacecraft, TC-1 and Cluster, separated by several Earth radii. The substorms have been identified in both auroral regions. One is believed to be triggered by a northward turning of the interplanetary magnetic field (IMF), while the other occurs under generally sout…
XMMU J134736.6+173403: an eclipsing LMXB in quiescence or a peculiar AGN?
Altieri, B.; King, A. R.; Nucita, A. +2 more
Aims:We report the discovery of a peculiar object observed serendipitously with XMM-Newton. We present its timing and spectral properties and investigate its optical counterpart.
Methods: The light curve of the X-ray source, its spectrum, and the spectrum of the best optical counterpart are presented and analyzed.
Results: The X-ray flux d…