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Deciphering sub-micron ice particles on Enceladus surface
D'Aversa, E.; Clark, R.; Tosi, F. +4 more
The surface of Saturn's moon Enceladus is composed primarily by pure water ice. The Cassini spacecraft has observed present-day geologic activity at the moon's South Polar Region, related with the formation and feeding of Saturn's E-ring. Plumes of micron-sized particles, composed of water ice and other non-ice contaminants (e.g., CO2, …
A Statistical Comparison between Photospheric Vector Magnetograms Obtained by SDO/HMI and Hinode/SP
Sainz Dalda, Alberto
Since 2010 May 1, we have been able to study (almost) continuously the vector magnetic field in the Sun, thanks to two space-based observatories: the Solar Dynamics Observatory (SDO) and Hinode. Both are equipped with instruments able to measure the Stokes parameters of Zeeman-induced polarization of photospheric line radiation. But the observatio…
On the impact of large angle CMB polarization data on cosmological parameters
Gerbino, Martina; Salvati, Laura; Burigana, Carlo +6 more
We study the impact of the large-angle CMB polarization datasets publicly released by the WMAP and Planck satellites on the estimation of cosmological parameters of the ΛCDM model. To complement large-angle polarization, we consider the high resolution (or "high-l") CMB datasets from either WMAP or Planck as well as CMB lensing as traced by Planck…
Vertical structure of the axi-asymmetric temperature disturbance in the Venusian polar atmosphere: Comparison between radio occultation measurements and GCM results
Tellmann, Silvia; Pätzold, Martin; Imamura, Takeshi +6 more
Vertical temperature profiles at 40-75 km around 80°N in the Venus polar vortex are retrieved over 13 Earth days almost continuously from radio occultation measurements (Venus Express radio occultation) in the Venus Express mission. They show periodical variations with a dominant period of ∼3.1 Earth days. These fluctuations are confined in an alt…
Solar Flare Termination Shock and Synthetic Emission Line Profiles of the Fe xxi 1354.08 Å Line
Li, Gang; Raymond, John; Guo, Lijia +1 more
Solar flares are among the most energetic phenomena that occur in the solar system. In the standard solar flare model, a fast mode shock, often referred to as the flare termination shock (TS), can exist above the loop-top source of hard X-ray emissions. The existence of the TS has been recently related to spectral hardening of a flare’s hard X-ray…
Little Blue Dots in the Hubble Space Telescope Frontier Fields: Precursors to Globular Clusters?
Elmegreen, Bruce G.; Elmegreen, Debra Meloy
Galaxies with stellar masses < {10}7.4 {M}⊙ and specific star formation rates {sSFR}> {10}-7.4 yr-1 were examined on images of the Hubble Space Telescope Frontier Field Parallels for Abell 2744 and MACS J0416.1-02403. They appear as unresolved “Little Blue Dots” (LBDs). They are less massive and h…
NuSTAR and XMM-Newton Observations of the 2015 Outburst Decay of GX 339-4
Stiele, H.; Kong, A. K. H.
The extent of the accretion disk in the low/hard state of stellar mass black hole X-ray binaries remains an open question. There is some evidence suggesting that the inner accretion disk is truncated and replaced by a hot flow, while the detection of relativistic broadened iron emission lines seems to require an accretion disk extending fully to t…
Detection of two intervening Ne viii absorbers probing warm gas at z ∼ 0.6
Savage, Blair D.; Wakker, Bart P.; Muzahid, Sowgat +3 more
We report on the detection of two Ne viii absorbers, at z = 0.619 07 and 0.570 52 in the Hubble Space Telescope/Cosmic Origins Spectrograph spectrum of background quasars SDSS J080908.13 + 461925.6 and SBS 1122 + 594, respectively. The Ne viii 770 line is at ∼3σ significance. In both instances, the Ne viii is found to be tracing gas with T ≳ 10
The dependence of magnetospheric plasma mass loading on geomagnetic activity using Cluster
Dandouras, I.; Sandhu, J. K.; Yeoman, T. K. +2 more
Understanding changes in the magnetospheric mass density during disturbed geomagnetic conditions provides valuable insight into the dynamics and structure of the environment. The mass density plays a significant role in a variety of magnetospheric processes, such as wave propagation, magnetic reconnection rates, and radiation belt dynamics. In thi…
The Abundance of C2H4 in the Circumstellar Envelope of IRC+10216
Hinkle, K. H.; Cernicharo, J.; Fonfría, J. P. +3 more
High spectral resolution mid-IR observations of ethylene ({{{C}}}2{{{H}}}4) toward the AGB star IRC+10216 were obtained using the Texas Echelon Cross Echelle Spectrograph (TEXES) at the NASA Infrared Telescope Facility (IRTF). 80 ro-vibrational lines from the 10.5 µm vibrational mode {ν }7 with J ≲ 30 were de…