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Electric field structure inside the secondary island in the reconnection diffusion region
Deng, X. H.; Huang, S. Y.; Zhou, M.
Secondary islands have recently been intensively studied because of their essential role in dissipating energy during reconnection. Secondary islands generally form by tearing instability in a stretched current sheet, with or without guide field. In this article, we study the electric field structure inside a secondary island in the diffusion regi…
Localized density enhancements in the magnetosheath: Three-dimensional morphology and possible importance for impulsive penetration
Nilsson, H.; Karlsson, T.; Trotignon, J. -G. +3 more
We use Cluster multipoint density measurements, using the spacecraft potential, to identify localized density enhancements (>50%) in the magnetosheath, and estimate their three-dimensional morphology and orientation. Typically one dimension of the density enhancements is shorter than others, is directed perpendicular to the background magnetic …
Transmission spectrum of Venus as a transiting exoplanet
Tanga, P.; Ehrenreich, D.; Vidal-Madjar, A. +6 more
On 5-6 June 2012, Venus will be transiting the Sun for the last time before 2117. This event is an unique opportunity to assess the feasibility of the atmospheric characterisation of Earth-size exoplanets near the habitable zone with the transmission spectroscopy technique and provide an invaluable proxy for the atmosphere of such a planet. In thi…
Strong outburst activity of the X-ray pulsar X Persei during 2001-2011
Tsygankov, S.; Lutovinov, A.; Chernyakova, M.
We present the results of a comprehensive analysis of the X-ray pulsar X Persei over the period 1996-2011, encompassing the quite low state and subsequent strong outburst activity. Using data from the Rossi X-ray Timing Explorer (RXTE) and Swift, we detected several consecutive outbursts, during which the source luminosity increased by a factor of…
Velocity and Magnetic Transients Driven by the X2.2 White-light Flare of 2011 February 15 in NOAA 11158
Maurya, R. A.; Ambastha, A.; Vemareddy, P.
The first X-class flare of the current solar cycle 24 occurred in Active Region NOAA 11158 during its central meridian passage on 2011 February 15. This two-ribbon white-light flare was observed by the Helioseismic and Magnetic Imager (HMI) on board the Solar Dynamics Observatory. During the peak phase of the flare, we detected magnetic and Dopple…
Detecting gravitationally lensed Population III galaxies with the Hubble Space Telescope and the James Webb Space Telescope
Broadhurst, Tom; Schaerer, Daniel; Östlin, Göran +6 more
Small galaxies consisting entirely of Population III (pop III) stars may form at high redshifts, and could constitute one of the best probes of such stars. Here, we explore the prospects of detecting gravitationally lensed pop III galaxies behind the galaxy cluster J0717.5+3745 (J0717) with both the Hubble Space Telescope (HST) and the upcoming Ja…
Suzaku Observations of the Hydra A Cluster out to the Virial Radius
Sato, Kosuke; Fukazawa, Yasushi; Nakazawa, Kazuhiro +12 more
We report on Suzaku observations of the northern half of the Hydra A cluster out to ∼ 1.4 Mpc, reaching the virial radius. There are the first Suzaku observations of a medium-size (kT ∼ 3 keV) cluster out to the virial radius. Two observations were conducted, north-west and north-east offsets, which continue in a filament direction and a void dire…
A 30 AU Radius CO Gas Hole in the Disk around the Herbig Ae Star Oph IRS 48
van Dishoeck, E. F.; Pontoppidan, K. M.; Herczeg, G. J. +1 more
The physical processes leading to the disappearance of disks around young stars are not well understood. A subclass of transitional disks, the so-called cold disks with large inner dust holes, provides a crucial laboratory for studying disk dissipation processes. IRS 48 has a 30 AU radius hole previously measured from dust continuum imaging at 18.…
On the metallicity dependence of crystalline silicates in oxygen-rich asymptotic giant branch stars and red supergiants
Zijlstra, A. A.; Boyer, M. L.; Gielen, C. +10 more
We investigate the occurrence of crystalline silicates in oxygen-rich evolved stars across a range of metallicities and mass-loss rates. It has been suggested that the crystalline silicate feature strength increases with increasing mass-loss rate, implying a correlation between lattice structure and wind density. To test this, we analyse Spitzer I…
Interpretation of combined infrared, submillimeter, and millimeter thermal flux data obtained during the Rosetta fly-by of Asteroid (21) Lutetia
Capaccioni, F.; Lee, S.; Hofstadter, M. +9 more
The European Space Agency’s Rosetta spacecraft is the first Solar System mission to include instrumentation capable of measuring planetary thermal fluxes at both near-IR (VIRTIS) and submillimeter-millimeter (smm-mm, MIRO) wavelengths. Its primary mission is a 1 year reconnaissance of Comet 67P/Churyumov-Gerasimenko beginning in 2014. During a 201…