Search Publications
Fast tailward flows in the plasma sheet boundary layer during a substorm on 9 March 2008: THEMIS observations
Zhang, T. L.; Glassmeier, K. -H.; Nakamura, R. +12 more
Tailward flows in the plasma sheet boundary layer (PSBL) were observed simultaneously by the five Time History of Events and Macroscale Interactions during Substorms (THEMIS) probes at down-tail distances X ∼ 7.6 to ∼17.6 RE for ∼10 min during an interval of successive substorm intensification in a storm time on 9 March 2008. The flows …
Statistical study of coronal mass ejection source locations: 2. Role of active regions in CME production
Wang, Yuming; Shen, Chenglong; Wang, S. +3 more
This is the second paper of the statistical study of coronal mass ejection (CME) source locations, in which the relationship between CMEs and active regions (ARs) is statistically studied on the basis of the information of CME source locations and the ARs automatically extracted from magnetic synoptic charts of Michelson Doppler Imager (MDI) durin…
Energy conversion regions as observed by Cluster in the plasma sheet
Dandouras, I.; André, M.; Hamrin, M. +5 more
In this article we present a review of recent studies of observations of localized energy conversion regions (ECRs) observed by Cluster in the plasma sheet at altitudes of 15-20RE. By examining variations in the power density, E · J, where E is the electric field and J is the current density, we show that the plasma sheet exhibits a hig…
Long-term variation in the thermosphere: TIMED/GUVI observations
Zhang, Y.; Paxton, Larry J.
Long-term changes in the thermospheric composition (O/N2 column density ratio) and exospheric temperature (Texo) have been examined. The data are obtained from TIMED/GUVI disk and limb measurements over half of a solar cycle from 2002 to 2007. The data indicate a positive correlation between O/N2 and solar EUV flux…
Multiple responses of magnetotail to the enhancement and fluctuation of solar wind dynamic pressure and the southward turning of interplanetary magnetic field
Zhang, T. L.; Dandouras, I.; Rème, H. +5 more
During the interval from 06:15 to 07:30 UT on 24 August 2005, the Chinese Tan-Ce 1 (TC1) satellite observed the multiple responses of the near-Earth magnetotail to the combined changes in solar wind dynamic pressure and interplanetary magnetic field (IMF). The magnetotail was highly compressed by a strong interplanetary shock because of the dynami…
Proton cyclotron wave generation mechanisms upstream of Venus
Zhang, T. L.; Volwerk, M.; Mazelle, C. +3 more
Long-term observations of proton cyclotron waves in the upstream region of Venus raise the question of under which general solar wind conditions these waves are generated and maintained. The waves are characterized by their occurrence at the local proton cyclotron frequency and left-hand polarization, both in the spacecraft frame. Magnetometer dat…
O+ outflow channels around Venus controlled by directions of the interplanetary magnetic field: Observations of high energy O+ ions around the terminator
Barabash, S.; Futaana, Y.; Yamauchi, M. +5 more
Using the plasma and the magnetic field data measured by the ASPERA-4 (Analyzer of Space Plasma and Energetic Atoms) and the magnetometer (MAG) onboard Venus Express between June 2006 and December 2008, positions of high energy O+ fluxes (>100 eV) near the Venus terminator are examined for two different interplanetary magnetic field …
Electron acceleration by an Alfvénic pulse propagating in an auroral plasma cavity
Génot, V.; Mottez, F.
With the help of a 2.5-D particle-in-cell simulation code, we investigate the physics of the acceleration of auroral electrons, through the interaction of an isolated Alfvén wave packet with a plasma density cavity. The cavity is edged by density gradients perpendicular to the magnetic field. We show that a single passing of an isolated wave packe…
On the origin of the energetic ion events measured upstream of the Earth's bow shock by STEREO, Cluster, and Geotail
Yamauchi, M.; Daly, P. W.; Klecker, B. +7 more
In 2007 during the declining phase of the solar cycle the energetic upstream ion events occurred mainly after a corotating interaction region passed the Earth's magnetosphere. We study the relation between these upstream events observed from about 70 to 1750 RE away from the Earth and observations in the vicinity of the terrestrial bow …
Neutral H2 and H2+ ions in the Saturnian magnetosphere
Johnson, Robert E.; Thomsen, Michelle F.; Tseng, Wei-Ling +2 more
The Saturnian system is immersed in an extended cloud of neutrals. Although water vapor ejected from Enceladus' south pole is the dominant neutral source, photolysis and radiolysis of ices can release H2O, O2, and H2 from the icy ring particles and the icy satellites, and Titan's atmosphere is a source of H2