Search Publications
Ionospheric signatures during a magnetospheric flux rope event
Owen, C. J.; Nakamura, R.; Sergeev, V. +6 more
On 13 August 2002, during a substorm, Cluster encountered two earthward moving flux ropes (FR) in the central magnetotail. The first FR was observed during the expansion phase of the substorm, and the second FR during the recovery phase. In the conjugate ionospheric region in Northern Fennoscandia, the ionospheric equivalent currents were observed…
A general Cluster data and global MHD simulation comparison
Daum, P.; Wild, J. A.; Taylor, M. G. G. T. +3 more
Among the many challenges facing the space weather modelling community today, is the need for validation and verification methods of the numerical models available describing the complex nonlinear Sun-Earth system. Magnetohydrodynamic (MHD) models represent the latest numerical models of this environment and have the unique ability to span the eno…
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…
Quantifying and containing the curse of high resolution coronal imaging
Delouille, V.; Hochedez, J. -F.; Chainais, P.
Future missions such as Solar Orbiter (SO), InterHelioprobe, or Solar Probe aim at approaching the Sun closer than ever before, with on board some high resolution imagers (HRI) having a subsecond cadence and a pixel area of about (80 km)2 at the Sun during perihelion. In order to guarantee their scientific success, it is necessary to ev…
A case study of dayside reconnection under extremely low solar wind density conditions
Dandouras, I.; Rème, H.; Maggiolo, R. +2 more
From 15 February 2004, 20:00 UT to 18 February 2004, 01:00 UT, the solar wind density dropped to extremely low values (about 0.35 cm-3). On 17 February, between 17:45 UT and 18:10 UT, the CLUSTER spacecraft cross the dayside magnetopause several times at a large radial distance of about 16 RE. During each of these crossings, …
Testing the local spacetime dynamics by heliospheric radiocommunication methods
Siewert, M.; Fahr, H. -J.
According to general relativistic theories, cosmological spacetime is dynamic. This prediction is in excellent agreement with the huge majority of astronomical observations on large cosmic scales, especially the observations of cosmological redshifts of distant galaxies. However, on scales of heliospheric distances, verifications of general relati…