Search Publications
Impact of solar wind depression on the dayside magnetosphere under northward interplanetary magnetic field
Ben-Jaffel, L.; Baraka, S.
We present a follow up study of the sensitivity of the Earth's magnetosphere to solar wind activity using a particles-in-cell model (Baraka and Ben Jaffel, 2007), but here during northward Interplanetary Magnetic Field (IMF). The formation of the magnetospheric cavity and its elongation around the planet is obtained with the classical structure of…
Spatial dependence of magnetopause energy transfer: Cluster measurements verifying global simulations
Dandouras, I.; Lucek, E. A.; Dunlop, M. +4 more
We investigate the spatial variation of magnetopause energy conversion and transfer using Cluster spacecraft observations of two magnetopause crossing events as well as using a global magnetohydrodynamic (MHD) simulation GUMICS-4. These two events, (16 January 2001, and 26 January 2001) are similar in all other aspects except for the sign of the i…
A comparison study between observations and simulation results of Barghouthi model for O+ and H+ outflows in the polar wind
Nilsson, H.; Barghouthi, I. A.; Ghithan, S. H.
To advance our understanding of the effect of wave-particle interactions on ion outflows in the polar wind region and the resulting ion heating and escape from low altitudes to higher altitudes, we carried out a comparison between polar wind simulations obtained using Barghouthi model with corresponding observations obtained from different satelli…
Lower hybrid resonances stimulated by the four CLUSTER relaxation sounders deep inside the plasmasphere: observations and inferred plasma characteristics
Lointier, G.; Rauch, J. -L.; Trotignon, J. -G. +6 more
The frequency range of the WHISPER relaxation sounder instrument on board CLUSTER, 4-80 kHz, has been chosen so as to encompass the electron gyro-frequency, Fce, and the electron plasma frequency, Fp, in most regions to be explored. Measurement of those frequencies, which are triggered as resonances by the sounder, provides a…
Interplanetary magnetic field rotations followed from L1 to the ground: the response of the Earth's magnetosphere as seen by multi-spacecraft and ground-based observations
Berchem, J.; Eastwood, J. P.; Lavraud, B. +17 more
A study of the interaction of solar wind magnetic field rotations with the Earth's magnetosphere is performed. For this event there is, for the first time, a full coverage over the dayside magnetosphere with multiple (multi)spacecraft missions from dawn to dusk, combined with ground magnetometers, radar and an auroral camera, this gives a unique c…
Coordinated Cluster/Double Star and ground-based observations of dayside reconnection signatures on 11 February 2004
Lester, M.; Dunlop, M. W.; Bogdanova, Y. V. +10 more
A number of flux transfer events (FTEs) were observed between 09:00 and 12:00 UT on 11 February 2004, during southward and dawnward IMF, while the Cluster spacecraft array moved outbound through the northern, high-altitude cusp and dayside high-latitude boundary layer, and the Double Star TC-1 spacecraft was crossing the dayside low-latitude magne…
Dynamics of ion sound waves in the front of the terrestrial bow shock
Walker, S. N.; Balikhin, M. A.; Giagkiozis, I.
Single spacecraft measurements from the Cluster 3 satellite are used to identify nonlinear processes in ion-sound turbulence observed within the front of the quasiperpendicular terrestrial bow shock. Ion sound waves possess spatial scales that are too small for the efficient use of multipoint measurements on inter-satellite separation scales. Howe…
Cluster observations of a transient signature in the magnetotail: implications for the mode of reconnection
Dandouras, I.; Lucek, E.; Fazakerley, A. N. +5 more
Travelling compression regions (TCRs) are perturbations in the magnetotail lobe magnetic field caused by structures moving Earthward or tailward within the plasma sheet. Previous works have suggested that these structures are created by either time-dependant reconnection occurring at a single X-line, forming a flux-bulge-type structure, or space-v…
Observations of an auroral streamer in a double oval configuration
Owen, C. J.; Nakamura, R.; Takada, T. +5 more
During the late evening and night of 14 September 2004, the nightside auroral oval shows a distinct double oval configuration for several hours after a substorm onset at ~18:45 UT. This structure is observed both by the IMAGE satellite optical instruments focusing on the Southern Hemisphere, and by the MIRACLE ground-based instrument network in Sc…
Modelling of spacecraft spin period during eclipse
Frey, H. U.; Plaschke, F.; Georgescu, E. +2 more
The majority of scientific satellites investigating the Earth magnetosphere are spin stabilized. The attitude information comes usually from a sun sensor and is missing in the umbra; hence, the accurate experimental determination of vector quantities is not possible during eclipses. The spin period of the spacecraft is generally not constant durin…