Search Publications

Coordinated Cluster and Double Star observations of the dayside magnetosheath and magnetopause at different latitudes near noon

Escoubet, C. P.; Pitout, F.; Dandouras, I. +5 more

We present results of a favorable conjunction where the equatorial spacecraft (TC-1) of the Double Star mission exits the dayside magnetopause near the equator, while Cluster is inbound, near the southern cusp. This configuration makes it possible to compare observations of the magnetopause, around the same magnetic local time but at different lat…

A comparison of Neutral Atom Detector Unit neutral atom image inversion with a comprehensive ring current model

Barabash, S.; Liu, Z. X.; Tang, C. L. +4 more

We present energetic neutral atom (ENA) images in the energy range 45 to 50 keV for H and 92 to 138 keV for O measured by the Neutral Atom Detector Unit (NUADU) onboard Double Star TC-2 during a geomagnetic storm on 8 May 2005. We compare the ion fluxes deduced from inversion of the NUADU image with those calculated using the Comprehensive Ring Cu…

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

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…

3D MHD reconnection model coupled with Cluster multi-spacecraft data

Nilsson, Hans; Balogh, André; Westerberg, Lars G. +2 more

We present a model where a three-dimensional viscous/resistive analytical model of the large scale plasma flow in the outflow region about a reconnection site at the dayside magnetopause, is coupled with multispacecraft measurements from the Cluster satellite armada. A total of ten magnetopause crossings have been analyzed during the period 10:29-…

On analyses of satellite ion scale reconnection data

Mozer, F. S.; Cully, C. M.

Analyses of satellite-measured fields and flows through reconnecting current sheets have assumed that the relative velocity of the satellite and the current sheet is in the direction of the current sheet normal. During analyses, this relative normal velocity has been removed by translation of the satellite data. The assumption that the relative mo…

Introduction to special section on Double Star-Cluster Coordinated Studies on Magnetospheric Dynamic Processes

Escoubet, C. P.; Zong, Q. -G.; Liu, Z. X. +1 more

Solar and interplanetary sources of major geomagnetic storms (Dst <= -100 nT) during 1996-2005

Thompson, B. J.; Webb, D. F.; Zhukov, A. N. +9 more

We present the results of an investigation of the sequence of events from the Sun to the Earth that ultimately led to the 88 major geomagnetic storms (defined by minimum Dst ≤ -100 nT) that occurred during 1996-2005. The results are achieved through cooperative efforts that originated at the Living with a Star (LWS) Coordinated Data-Analysis Works…

Geoeffectiveness of halo coronal mass ejections

Gopalswamy, N.; Yashiro, S.; Akiyama, S.

We studied the geoeffectiveness, speed, solar source, and flare association of a set of 378 halo coronal mass ejections (CMEs) of cycle 23 (1996-2005, inclusive). We compiled the minimum Dst values occurring within 1-5 days after the CME onset. We compared the distributions of such Dst values for the following subsets of halo CMEs: disk halos (wit…

Magnetospheric configurations from a high-resolution data-based magnetic field model

Sitnov, M. I.; Tsyganenko, N. A.

We present first results of the magnetospheric magnetic field modeling, based on large sets of spacecraft data and a high-resolution expansion for the field of equatorial currents. In this approach, the field is expanded into a sum of orthogonal basis functions of different scales, capable to reproduce arbitrary radial and azimuthal variations of …