Search Publications
Periodic traveling compression regions during quiet geomagnetic conditions and their association with ground Pi2
Dandouras, I.; Lucek, E.; Hasegawa, H. +5 more
Recently, Keiling et al. (2006) showed that periodic (~90 s) traveling compression regions (TCRs) during a substorm had properties of Pi2 pulsations, prompting them to call this type of periodic TCRs "lobe Pi2". It was further shown that time-delayed ground Pi2 had the same period as the lobe Pi2 located at 16 RE, and it was concluded t…
Nonlinear low-frequency wave aspect of foreshock density holes
Rème, H.; Parks, G. K.; Lin, N. +3 more
Recent observations have uncovered short-duration density holes in the Earth's foreshock region. There is evidence that the formation of density holes involves non-linear growth of fluctuations in the magnetic field and plasma density, which results in shock-like boundaries followed by a decrease in both density and magnetic field. In this study w…
Locating the solar source of 13 April 2006 magnetic cloud
van Driel-Gesztelyi, L.; Owen, C. J.; Démoulin, P. +5 more
Using Advanced Composition Explorer (ACE) in situ data we identify and describe an interplanetary magnetic cloud (MC) observed near Earth on 13 April 2006. We also use multi-instrument and multi-wavelength observations from the Solar and Heliospheric Observatory (SOHO), the Transition Region and Coronal Explorer (TRACE) and ground-based solar obse…
Sunward propagating Pc5 waves observed on the post-midnight magnetospheric flank
Glassmeier, K. -H.; Blomberg, L. G.; Schaefer, S. +1 more
The overall focus on the driver of toroidal Pc5 waves has been on processes located at or acting on the dayside magnetopause and dayside flanks of the magnetosphere. These processes can generate waves that propagate tailward in the magnetosphere. However, an increasing number of studies, both theoretical and experimental, have looked at waves prop…
Blob formation and acceleration in the solar wind: role of converging flows and viscosity
Lapenta, G.; Restante, A. L.
The effect of viscosity and of converging flows on the formation of blobs in the slow solar wind is analysed by means of resistive MHD simulations. The regions above coronal streamers where blobs are formed (Sheeley et al., 1997) are simulated using a model previously proposed by Einaudi et al. (1999). The result of our investigation is two-fold. …
Solar wind dependence of ion parameters in the Earth's magnetospheric region calculated from CLUSTER observations
Taylor, M. G. G. T.; Denton, M. H.
Moments calculated from the ion distributions (~0-40 keV) measured by the Cluster Ion Spectrometry (CIS) instrument are combined with data from the Cluster Flux Gate Magnetometer (FGM) instrument and used to characterise the bulk properties of the plasma in the near-Earth magnetosphere over five years (2001-2005). Results are presented in the form…
Plasma transport along discrete auroral arcs and its contribution to the ionospheric plasma convection
Fazakerley, A. N.; Nilsson, H.; Buchert, S. +6 more
The role of intense high-altitude electric field (E-field) peaks for large-scale plasma convection is investigated with the help of Cluster E-field, B-field and density data. The study covers 32 E-field events between 4 and 7 RE geocentric distance, with E-field magnitudes in the range 500 1000 mV/m when mapped to ionospheric altitude. …
Bifurcation of the tail current sheet and ion temperature anisotropy
Israelevich, P. L.; Ershkovich, A. I.
We investigated the relation between the geotail current sheet structure and the anisotropy of the ion temperature in the plasma sheet. Current density distribution in the geomagnetic tail is shown not to depend on the ratio between the parallel and perpendicular ion temperature. The tail current sheet bifurcation is controlled by non-gyrotropicit…
Reconstruction of time-varying reconnection rate and X-line location
Semenov, V. S.; Ivanov, I. B.; Kiehas, S. A. +2 more
Remote-sensing method developed on the basis of time-dependent Petschek-type reconnection model is applied to Cluster magnetotail measurements from 8 September 2002, where a series of earthward propagating NFTEs (nightside flux transfer events) was observed. The method utilizes single-spacecraft magnetic data as an input and provides the reconnect…
Reconnection in a slow Coronal Mass Ejection
Romoli, M.; Bemporad, A.; Landini, F. +1 more
This paper aims at studying reconnection occurring in the aftermath of the 28 May 2004, CME, first imaged by the LASCO (Large Angle and Spectrometric Coronagraph) C2 at 11:06 UT. The CME was observed in White Light and UV radiation: images acquired by the LASCO C2 and C3 coronagraphs and spectra acquired by UVCS (Ultraviolet Coronagraph Spectromet…