Search Publications
Multi-point observations of earthward fast flow in the plasma sheet by virtual satellites located in the MHD simulation domain
Kondoh, Koji; Shimizu, Tohru; Ugai, Masayuki
Time profiles of some physical values in earthward fast flows in the plasma sheet are observed at three dimensionally different positions by employing virtual satellites located in the three-dimensional magnetohydrodynamic simulation domain, and these simulations are done on the basis of the spontaneous fast reconnection model. In the spontaneous …
Pulse characterization of long gamma-ray bursts with known redshift
Kawai, Nobuyuki; Vasquez, Nicolas
Gamma-ray bursts (GRBs) are one of the most promising tools in the study of cosmology. Luminosity, energy, light curve parameters and spectral characteristics could contribute to the calibration of standard candles in the Universe. Nevertheless, cosmological and non-cosmological effects are not well understood. Aiming to clarify those possible eff…
A Multiwavelength Study of the Runaway Binaries HD 14633 and HD 15137
De Becker, Michaël; Boyajian, Tabetha S.; McSwain, M. Virginia +1 more
The runaway O-type binaries HD 14633 and HD 15137 were likely ejected from the cluster of their birth by supernovae explosions in close binaries. Here we present recent optical spectra to update the orbital solutions of the binaries and study the physical parameters of the O star primaries. We also present XMM-Newton observations of both systems t…
A pseudo-magnetic flux rope observed by the THEMIS satellites in the Earth's magnetotail
Sarafopoulos, D. V.
We investigate an extraordinary event showing all the typical magnetic flux rope (MFR) signatures, although it is not really a MFR structure. It occurred on 1 March 2008 in the Earth's magnetotail and was observed by a major tail conjunction of Time History of Events and Macroscale Interactions during Substorms (THEMIS) satellites. THEMIS B and C …
Correction to “Global magnetohydrodynamic simulation of reconnection and turbulence in the plasma sheet”
Goldstein, Melvyn L.; El-Alaoui, Mostafa; Walker, Raymond J. +3 more
Abstract Available from http://www.agu.org
The INTEGRAL view of Gamma-Ray Bursts
McGlynn, S.; Foley, S.; Bazzano, A. +3 more
After more than six and half years in orbit, the ESA space observatory INTEGRAL has provided new, exciting results in the soft gamma-ray energy range (from a few keV to a few MeV). With the discovery of about 700 hard X-Ray sources, it has changed our previous view of a sky composed of peculiar and “monster” sources. The new high energy sky is in …
Zonal Flows Throughout Cycle 23
Basu, Sarbani; Antia, H. M.
We use available GONG and MDI data to study how solar zonal flows evolved over cycle 23 and whether or not there were differences between the minima of cycles 23 and 24. An autocorrelation study shows that as far as the zonal-flows are concerned, cycle 23 lasted for about 11.7 years, considerably shorter than what is seen from magnetic indices. We…
UV spectroscopy of the hot bare stellar core H1504+65 with the HST Cosmic Origins Spectrograph
Rauch, T.; Werner, K.
We present new ultraviolet spectra of the hottest known, peculiar white dwarf H1504+65, obtained with the Cosmic Origins Spectrograph on the Hubble Space Telescope. H1504+65 is the hottest known white dwarf (Teff=200 000 K) and has an atmosphere mainly composed by carbon and oxygen, augmented with high amounts of neon and magnesium. Thi…
Saturn Kilometric Radiation Near a Source Center on Day 73, 2008
Schippers, P.; Gurnett, D. A.; Kurth, W. S. +6 more
The Cassini spacecraft flew very near a source region of Saturn kilometric radiation (SKR) on day 073 of 2008. This is the second known encounter with a source region at high latitude. The radio and plasma wave instrument, RPWS, observed intense SKR in the extraordinary (X) mode. The electron low-energy spectrometer (ELS) obtained a phase space di…
On ion escape from Venus
Jarvinen, Riku
This doctoral thesis is about the solar wind influence on the atmosphere of the planet Venus. A numerical plasma simulation model was developed for the interaction between Venus and the solar wind to study the erosion of charged particles from the Venus upper atmosphere. The developed model is a hybrid simulation where ions are treated as particle…