Search Publications
Bow shock and magnetopause contributions to the magnetospheric current system: Hints from the Cluster observations
Wang, C.; Tang, B. B.; Guo, X. C.
We perform a statistical study of the surface current at the high-latitude magnetopause (HLMP) and the bow shock under different southward interplanetary magnetic field (IMF) conditions, taking advantage of the crossing events of these discontinuities by the Cluster spacecraft. With an enhancement of southward IMF BZ, the surface curren…
A physical model for electron radiation belts of Saturn
Lorenzato, Lise; Sicard, AngéLica; Bourdarie, SéBastien
Radiation belts cause irreversible damages to on-board instrument materials. Studies about radiation belts can provide precious information for future interplanetary missions. Pioneer 11, Voyager 2 and nowadays Cassini missions give the characteristics of Saturn's inner magnetosphere: Saturn's famous rings, various moons, neutral particles ejected…
Whistler anisotropy instability with a cold electron component: Linear theory
Gary, S. Peter; Liu, Kaijun; Denton, Richard E. +1 more
The whistler anisotropy instability is driven by an electron temperature anisotropy T⊥/T∥ > 1 where ⊥ and ∥ denote directions perpendicular and parallel, respectively, to the background magnetic field Bo. Here kinetic linear theory in a magnetized, homogeneous, collisionless plasma model is used to study this in…
Multidimensional nonlinear mirror-mode structures in the Earth's magnetosheath
Omura, Yoshiharu; Shoji, Masafumi; Lee, Lou-Chuang
We performed two-dimensional (2D) and three-dimensional (3D) hybrid simulations in open boundary models to study the nonlinear mirror-mode structures driven by the temperature anisotropy (T⊥/T∥> 1) of protons in the magnetosheath. In the open systems, because of the propagation of EMIC waves, we obtain the clearer non-prop…
Magnetic flux rope formation within a magnetosheath hot flow anomaly
Zhang, H.; Zong, Q. -G.; Lavraud, B. +4 more
We report observations on 1 March 2004 by the Cluster spacecraft of a hot flow anomaly (HFA) encountered in the dayside magnetosheath near Earth's bow shock. Embedded within the HFA was a magnetic flux rope with a diameter of a few thousand km, which was moving sunward and was presumably expanding. The pristine upstream solar wind seen by the ACE …
Solar cycle dependence of the cusp O+ access to the near-Earth magnetotail
Dandouras, I.; Klecker, B.; Kistler, L. M. +2 more
Ionospheric origin O+ accelerated in the cusp/cleft region is one source for the O+ observed in the plasma sheet. This O+ is convected over the polar cap, flowing along open field lines to the tail lobes, and finally entering the plasma sheet. In this paper we use Cluster/CODIF data to study how the occurrence of c…
Energetic electron fluxes at Saturn from Cassini observations
Summers, Danny; Tang, Rongxin
Energetic electron fluxes (18 keV-21 MeV) observed by the MIMI/LEMMS instrument on the Cassini mission during 2004 to 2008 are analyzed. We consider all 101 orbits and we select portions of the orbits that lie within 0.5 RS of the magnetic equatorial plane, where RS is Saturn's radius. We determine the average electron differ…
Changes in the magnetotail configuration before near-Earth reconnection
Gordeev, E. I.; Snekvik, K.; Østgaard, N. +4 more
We have examined three typical substorm growth phase signatures in the magnetotail two hours before near Earth reconnection; namely current sheet thinning, field line stretching and increase in the lobe magnetic pressure. The reconnection events were identified from in situ measurements in the plasma sheet by the Cluster spacecraft. The events wer…
Understanding shock dynamics in the inner heliosphere with modeling and Type II radio data: The 2010-04-03 event
St. Cyr, O. C.; Odstrcil, D.; Gopalswamy, N. +3 more
The 2010 April 03 solar event was studied using observations from STEREO SECCHI, SOHO LASCO, and Wind kilometric Type II data (kmTII) combined with WSA-Cone-ENLIL model simulations performed at the Community Coordinated Modeling Center (CCMC). In particular, we identified the origin of the coronal mass ejection (CME) using STEREO EUVI and SOHO EIT…
Dynamics of long-period ULF waves in the plasma sheet: Coordinated space and ground observations
Zhang, T. L.; Nakamura, R.; Baumjohann, W. +11 more
Spacecraft and ground-based observations are used to study characteristics of ultralow frequency waves in the plasma sheet from the postmidnight to morning local time sectors in the terrestrial magnetosphere. Field line resonance (FLR) type oscillations with discrete and latitude-dependent frequencies in the ranges of 1.7-2.0 and 3.0-3.2 mHz are o…