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Multi-instrument X-ray monitoring of the January 2009 outburst from the recurrent magnetar candidate 1E 1547.0-5408
Campana, S.; Tiengo, A.; Götz, D. +9 more
Context. With two consecutive outbursts recorded in four months (October 2008 and January 2009), and a possible third outburst in 2007, 1E 1547.0-5408 is one of the most active transient anomalous X-ray pulsars known so far.
Aims: Thanks to extensive X-ray observations, obtained both in the quiescent and active states, 1E 1547.0-5408 represen…
HST/COS Observations of Galactic High-velocity Clouds: Four Active Galactic Nucleus Sight Lines through Complex C
Shull, J. Michael; Lockman, Felix J.; Penton, Steven V. +3 more
We report ultraviolet spectra of Galactic high-velocity clouds (HVCs) in Complex C, taken by the Cosmic Origins Spectrograph (COS) on the Hubble Space Telescope (HST), together with new 21 cm spectra from the Green Bank Telescope. The wide spectral coverage and higher signal-to-noise ratio, compared to previous HST spectra, provide better velocity…
Landscape evolution in Martian mid-latitude regions: insights from analogous periglacial landforms in Svalbard
Preusker, F.; Trauthan, F.; Hauber, E. +2 more
Periglacial landforms on Spitsbergen (Svalbard, Norway) are morphologically similar to landforms on Mars that are probably related to the past and/or present existence of ice at or near the surface. Many of these landforms, such as gullies, debris-flow fans, polygonal terrain, fractured mounds and rock-glacier-like features, are observed in close …
Annual survey of water vapor behavior from the OMEGA mapping spectrometer onboard Mars Express
Maltagliati, Luca; Bibring, Jean-Pierre; Forget, Francois +4 more
We present here the annual behavior of atmospheric water vapor on Mars, as observed by the OMEGA spectrometer on board Mars Express during its first martian year. We consider all the different features of the cycle of water vapor: temporal evolution, both at a seasonal and at a diurnal scale; longitudinal distribution; and the vertical profile, th…
Spectroscopic Observations of Continuous Outflows and Propagating Waves from NOAA 10942 with Extreme Ultraviolet Imaging Spectrometer/Hinode
Hara, H.; Nishizuka, N.
We focused on "sit-and-stare" observations of an outflow region at the edge of active region NOAA 10942 on 2007 February 20 obtained by the Extreme ultraviolet Imaging Spectrometer on board Hinode. We analyzed the data above the base of the outflow and found both continuous outflows and waves, which propagate from the base of the outflow. The spec…
Infrared Spectra and Spectral Energy Distributions for Dusty Starbursts and Active Galactic Nuclei
Lebouteiller, Vianney; Weedman, Daniel; Sargsyan, Lusine +4 more
We present spectroscopic results for all galaxies observed with the Spitzer Infrared Spectrograph (IRS) that also have total infrared fluxes f IR measured with the Infrared Astronomical Satellite (IRAS), also using AKARI photometry when available. Infrared luminosities and spectral energy distributions (SEDs) from 8 µm to 160 &mic…
Nightside reconnection at Jupiter: Auroral and magnetic field observations from 26 July 1998
Bonfond, B.; Vogt, M. F.; Grodent, D. +3 more
In this study we present ultraviolet and infrared auroral data from 26 July 1998, and we show the presence of transient auroral polar spots observed throughout the postdusk to predawn local time sector. The polar dawn spots, which are transient polar features observed in the dawn sector poleward of the main emission, were previously associated wit…
Nightside ionosphere of Mars studied with local electron densities: A general overview and electron density depressions
Gurnett, D. A.; Winningham, J. D.; Frahm, R. A. +3 more
The radar sounder Mars Advanced Radar for Subsurface and Ionospheric Sounding (MARSIS) on the Mars Express spacecraft provides local electron densities from electron plasma oscillations. Here, we use the local electron densities to study the nightside ionosphere of Mars. In this study, in which local densities were sampled to a minimum altitude of…
The magnetohydrodynamic turbulent cascade in the ecliptic solar wind: Study of Ulysses data
Sorriso-Valvo, Luca; Marino, Raffaele; Bruno, Roberto +3 more
The occurrence of a nonlinear turbulent energy cascade in solar wind plasma has been recently established through the observation of an exact law from spacecraft measurements. The main results obtained in the fast, polar wind measured by Ulysses spacecraft are reviewed here. In particular, the turbulent cascade is seen as the mean to provide the e…
Two types of tangential magnetopause current sheets: Cluster observations and theory
Nakamura, R.; Baumjohann, W.; Artemyev, A. V. +1 more
Early magnetopause observations revealed that the magnetic field can rotate across tangential current sheets in the form of C-and S-shaped hodograms. We use the four-spacecraft magnetopause crossings by Cluster in order to study the structure of the C- and S-sheets. We show that both current sheets can be described by analytical equilibria. We emp…