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Magnitude of the Hall fields during magnetic reconnection
Egedal, J.; Daughton, W.; Drake, J. F. +3 more
In situ observation of the Earth's magnetosphere has identified Hall magnetic fields as a key signature of collisionless magnetic reconnection. The inflow portion of the reconnection diffusion region is further characterized by strong electron pressure anisotropy. These two features are tightly linked in a quantitative model, which is verified usi…
Spatially resolved study of the physical properties of the ionized gas in NGC 595
Kennicutt, R. C.; Monreal-Ibero, A.; Relaño, M. +1 more
We present Integral Field Spectroscopy (IFS) of NGC 595, one of the most luminous HII regions in M33. This type of observations allows us to study the variation of the principal emission-line ratios across the surface of the nebula. At each position of the field of view, we fit the main emission-line features of the spectrum within the spectral ra…
Disk-integrated bolometric Bond albedos and rotational light curves of saturnian satellites from Cassini Visual and Infrared Mapping Spectrometer
Buratti, Bonnie J.; Mosher, Joel A.; Pitman, Karly M.
We present values from the Cassini Visual and Infrared Mapping Spectrometer (VIMS) of four fundamental disk-integrated spectrophotometric properties (bolometric Bond albedo, solar phase curve, phase integral, and geometric albedo at 7-15 different wavelengths in the λ = 0.35-5.1 µm range) for five mid-sized saturnian icy satellites: Rhea, Di…
Active region moss. Basic physical parameters and their temporal variation
Young, P. R.; Mason, H. E.; Del Zanna, G. +1 more
Context. Active region moss are transition region phenomena, first noted in the images recorded by the Transition Region and Coronal Explorer (TRACE) in λ171. Moss regions are thought to be the footpoints of hot loops (3-5 MK) seen in the core of active regions. These hot loops appear “fuzzy” (unresolved). Therefore, it is difficult to study the p…
From high-mass starless cores to high-mass protostellar objects
Henning, Th.; Krause, O.; Beuther, H. +3 more
Aims: Our aim is to understand the evolutionary sequence of high-mass star formation from the earliest evolutionary stage of high-mass starless cores, via high-mass cores with embedded low- to intermediate-mass objects, to finally high-mass protostellar objects.
Methods: Herschel far-infrared PACS and SPIRE observations are combined with…
Late Noachian to Hesperian climate change on Mars: Evidence of episodic warming from transient crater lakes near Ares Vallis
Muller, Jan-Peter; Gupta, Sanjeev; Kim, Jung-Rack +3 more
The Ares Vallis region is surrounded by highland terrain containing both degraded and pristine large impact craters that suggest a change in climate during the Late Noachian-Early Hesperian, from warmer, wetter conditions to colder, dryer conditions. However, the regional occurrence of Hesperian-age crater outlet channels indicates that this perio…
The Nascent Fast Solar Wind Observed by the EUV Imaging Spectrometer on Board Hinode
He, Jiansen; Tian, Hui; Marsch, Eckart +2 more
The origin of the solar wind is one of the most important unresolved problems in space and solar physics. We report here the first spectroscopic signatures of the nascent fast solar wind on the basis of observations made by the EUV Imaging Spectrometer on Hinode in a polar coronal hole in which patches of blueshift are clearly present on Dopplergr…
The Araucaria Project: First Cepheid Distance to the Sculptor Group Galaxy NGC 7793 from Variables Discovered in a Wide-field Imaging Survey
Udalski, Andrzej; Soszyński, Igor; Wyrzykowski, Łukasz +12 more
For the first time, we have detected Cepheid variables in the Sculptor Group spiral galaxy NGC 7793. From wide-field images obtained in the optical V and I bands on 56 nights in 2003-2005, we have discovered 17 long-period (24-62 days) Cepheids whose periods and mean magnitudes define tight period-luminosity relations. We use the (V - I) Wesenheit…
Searching for dark matter in X-rays: how to check the dark matter origin of a spectral feature
Boyarsky, Alexey; Ruchayskiy, Oleg; Iakubovskyi, Dmytro +3 more
A signal from decaying dark matter (DM) can be unambiguously distinguished from spectral features of astrophysical or instrumental origin by studying its spatial distribution. We demonstrate this approach by examining the recent claim of Loewenstein and Kusenko regarding the possible DM origin of the 2.5 keV line in Chandra observations of the Mil…
Coupling mantle convection and tidal dissipation: Applications to Enceladus and Earth-like planets
Čadek, Ondřej; Tobie, Gabriel; Běhounková, Marie +1 more
Anelastic dissipation of tidal forces likely contributes to the thermal budget of several satellites of giant planets and Earth-like planets closely orbiting other stars. In order to address how tidal heating influences the thermal evolution of such bodies, we describe here a new numerical tool that solves simultaneously mantle convection and tida…