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Venus Express observations of an atypically distant bow shock during the passage of an interplanetary coronal mass ejection
Russell, C. T.; Zhang, T. L.; Glassmeier, K. -H. +10 more
On 10-11 September 2006 the Venus Express magnetometer detected a very strong Interplanetary Coronal Mass Ejection (ICME) event with an average field about 2 times higher than that of a typical ICME at 0.72 AU. While the effective obstacle to the solar wind is compressed to a smaller dimension during this ICME event, the bow shock is located far u…
Ultra-low-frequency waves and associated wave vectors observed in the plasma sheet boundary layer by Cluster
Glassmeier, K. -H.; RèMe, H.; Keiling, A. +5 more
Waves in the Pc1-Pc2 frequency range (0.1-5 Hz) are studied using Cluster magnetic field data. In the plasma sheet boundary layer, Cluster observed harmonically related waves with the fundamental near the local proton cyclotron frequency (Ωp). These waves had components both parallel and perpendicular to the local magnetic field (B…
The most rapidly rotating He-strong emission line star: HR 7355
Baade, D.; Rivinius, T.; Townsend, R. H. D. +1 more
Aims: We searched for massive stars with Balmer emission consistent with magnetically confined circumstellar material.
Methods: Archival spectroscopic and photometric data were investigated.
Results:
Time dependent model of the interplanetary Lyman α glow: applications to the SWAN data
Izmodenov, V.; Quémerais, E.; Koutroumpa, D. +1 more
Aims: Previous results of the study of interplanetary Lyman α background data obtained by the SWAN-SOHO between 1996 and 2005 clearly show that the solar cycle variations of the solar parameters deeply affect the interplanetary background emission. In this work, we compare these observational results with a time-dependent modeling of the interplan…
Search for cosmic strings in the Great Observatories Origins Deep Survey
Smoot, G. F.; Christiansen, J. L.; Albin, E. +3 more
We search Hubble Space Telescope Treasury Program images collected as part of the Great Observatories Origins Deep Survey for pairs of galaxies consistent with the gravitational lensing signature of a cosmic string. Our technique includes estimates of the efficiency for finding the lensed galaxy pair. In the north (south) survey field we find no e…
XMM-Newton discovery of transient X-ray pulsar in NGC 1313
Trudolyubov, S. P.
We report on the discovery and analysis of the transient X-ray pulsar XMMU J031747.5-663010 detected in the 2004 November 23 XMM-Newton observation of the spiral galaxy NGC 1313. The X-ray source exhibits pulsations with a period P ~ 765.6 s and a nearly sinusoidal pulse shape and pulsed fraction ~38 per cent in the 0.3-7 keV energy range. The X-r…
Effective temperatures of magnetic chemically peculiar stars from full spectral energy distributions
Lipski, Ł.; Stȩpień, K.
New determinations of effective temperatures of 23 magnetic, chemically peculiar (mCP) stars were obtained from a fit of metal-enhanced model atmospheres to the observed spectral energy distributions (SED) from ultraviolet (UV) to red. Temperatures of four more CP stars without magnetic measurements were also obtained, of which three show light va…
Radio occultation measurements and MGCM simulations of Kelvin waves on Mars
Pätzold, M.; Wilson, R. J.; Hinson, D. P. +3 more
We have derived new results concerning thermal tides on Mars from a combination of radio occultation measurements and numerical simulations by a Mars General Circulation Model (MGCM). This investigation exploits a set of concurrent observations by Mars Express (MEX) and Mars Global Surveyor (MGS) in mid-2004, when the season on Mars was midspring …
PFS/MEX observations of the condensing CO 2 south polar cap of Mars
Forget, F.; Grassi, D.; Formisano, V. +3 more
The condensing CO 2 south polar cap of Mars and the mechanisms of the CO 2 ice accumulation have been studied through the analysis of spectra acquired by the Planetary Fourier Spectrometer (PFS) during the first two years of ESA's Mars Express (MEX) mission. This dataset spans more than half a martian year, from Ls∼330° to Ls…
Disintegration of Magnetic Flux in Decaying Sunspots as Observed with the Hinode SOT
Kubo, M.; Lites, B. W.; Ichimoto, K. +8 more
Continuous observations of sunspot penumbrae with the Solar Optical Telescope aboard Hinode clearly show that the outer boundary of the penumbra fluctuates around its averaged position. The penumbral outer boundary moves inward when granules appear in the outer penumbra. We discover that such granules appear one after another while moving magnetic…