Search Publications
Coronal mass ejections, type II radio bursts, and solar energetic particle events in the SOHO era
Kaiser, M. L.; Howard, R. A.; Gopalswamy, N. +5 more
Using the extensive and uniform data on coronal mass ejections (CMEs), solar energetic particle (SEP) events, and type II radio bursts during the SOHO era, we discuss how the CME properties such as speed, width and solar-source longitude decide whether CMEs are associated with type II radio bursts and SEP events. We discuss why some radio-quiet CM…
Transient and localized processes in the magnetotail: a review
Zelenyi, L. M.; Sauvaud, J. -A.; Louarn, P. +16 more
Many phenomena in the Earth's magnetotail have characteristic temporal scales of several minutes and spatial scales of a few Earth radii (RE). Examples of such transient and localized mesoscale phenomena are bursty bulk flows, beamlets, energy dispersed ion beams, flux ropes, traveling compression regions, night-side flux transfer event…
Spectra and anisotropy of magnetic fluctuations in the Earth's magnetosheath: Cluster observations
Alexandrova, O.; Mangeney, A.; Lacombe, C.
We investigate the spectral shape, the anisotropy of the wave vector distributions and the anisotropy of the amplitudes of the magnetic fluctuations in the Earth's magnetosheath within a broad range of frequencies [10-3, 10] Hz which corresponds to spatial scales from ~10 to 105 km. We present the first observations of a Kolm…
Processes and mechanisms governing the initiation and propagation of CMEs
Vršnak, B.
The most important observational characteristics of coronal mass ejections (CMEs) are summarized, emphasizing those aspects which are relevant for testing physical concepts employed to explain the CME take-off and propagation. In particular, the kinematics, scalings, and the CME-flare relationship are stressed. Special attention is paid to 3-dimen…
A comparison of coronal mass ejections identified by manual and automatic methods
Gopalswamy, N.; Michalek, G.; Yashiro, S.
Coronal mass ejections (CMEs) are related to many phenomena (e.g. flares, solar energetic particles, geomagnetic storms), thus compiling of event catalogs is important for a global understanding these phenomena. CMEs have been identified manually for a long time, but in the SOHO era, automatic identification methods are being developed. In order t…
Statistical analysis of plasmaspheric plumes with Cluster/WHISPER observations
de Keyser, J.; Décréau, P. M. E.; Vallières, X. +2 more
Plasmaspheric plumes have been routinely observed by the four Cluster spacecraft. This paper presents a statistical analysis of plumes observed during five years (from 1 February 2001 to 1 February 2006) based on four-point measurements of the plasmasphere (outside 4 Earth radii) as it is sampled by the spacecraft in a narrow local time sector bef…
Two-spacecraft reconstruction of a magnetic cloud and comparison to its solar source
Möstl, C.; Farrugia, C. J.; Temmer, M. +5 more
This paper compares properties of the source region with those inferred from satellite observations near Earth of the magnetic cloud which reached 1 AU on 20 November 2003. We use observations from space missions SOHO and TRACE together with ground-based data to study the magnetic structure of the active region NOAA 10501 containing a highly curve…
A review of the quantitative links between CMEs and magnetic clouds
Démoulin, P.
Magnetic clouds (MCs), and more generally, interplanetary coronal mass ejections (ICMEs), are believed to be the interplanetary counterparts of CMEs. The link has usually been shown by taking into account the CME launch position on the Sun, the expected time delay and by comparing the orientation of the coronal and interplanetary magnetic field. M…
IMF dependence of high-latitude thermospheric wind pattern derived from CHAMP cross-track measurements
Liu, H.; Haaland, S. E.; Förster, M. +2 more
Neutral thermospheric wind pattern at high latitudes obtained from cross-track acceleration measurements of the CHAMP satellite above both North and South polar regions are statistically analyzed in their dependence on the Interplanetary Magnetic Field (IMF) direction in the GSM y-z plane (clock angle). We compare this dependency with magnetospher…
The azimuthal extent of three flux transfer events
Dandouras, I.; Fazakerley, A. N.; Lucek, E. A. +3 more
In early 2006, the Cluster spacecraft crossed the dayside magnetopause twice each orbit with the spacecraft at their largest separation of the entire mission (~10 000 km). In this paper, we present in situ observations at this separation size of flux transfer events (FTEs), which are a signature of transient or time-varying magnetopause reconnecti…