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What Causes the High Apparent Speeds in Chromospheric and Transition Region Spicules on the Sun?
Martínez-Sykora, Juan; De Pontieu, Bart; Chintzoglou, Georgios
Spicules are the most ubuiquitous type of jets in the solar atmosphere. The advent of high-resolution imaging and spectroscopy from the Interface Region Imaging Spectrograph (IRIS) and ground-based observatories has revealed the presence of very high apparent motions of order 100-300 km s-1 in spicules, as measured in the plane of the s…
Explosive events in active region observed by IRIS and SST/CRISP
Doyle, J. G.; Madjarska, M. S.; Huang, Z. +3 more
Transition-region explosive events (EEs) are characterized by non-Gaussian line profiles with enhanced wings at Doppler velocities of 50-150 km s-1. They are believed to be the signature of solar phenomena that are one of the main contributors to coronal heating. The aim of this study is to investigate the link of EEs to dynamic phenome…
Impact crater relaxation on Dione and Tethys and relation to past heat flow
Schenk, Paul M.; White, Oliver L.; Bray, Veronica J. +3 more
Relating relaxation of impact crater topography to past heat flow through the crusts of icy satellites is a technique that has been applied to satellites around Jupiter and Saturn. We use global digital elevation models of the surfaces of Dione and Tethys generated from Cassini data to obtain crater depth/diameter (d/D) data. Relaxation is found t…
Cometary dust: the diversity of primitive refractory grains
Wooden, D. H.; Ishii, H. A.; Zolensky, M. E.
Comet dust is primitive and shows significant diversity. Our knowledge of the properties of primitive cometary particles has expanded significantly through microscale investigations of cosmic dust samples (anhydrous interplanetary dust particles (IDPs), chondritic porous (CP) IDPs and UltraCarbonaceous Antarctic micrometeorites, Stardust and Roset…
Aperture synthesis imaging of the carbon AGB star R Sculptoris. Detection of a complex structure and a dominating spot on the stellar disk
de Gregorio-Monsalvo, I.; Eriksson, K.; Lindqvist, M. +16 more
Aims: We present near-infrared interferometry of the carbon-rich asymptotic giant branch (AGB) star R Sculptoris (R Scl).
Methods: We employ medium spectral resolution K-band interferometry obtained with the instrument AMBER at the Very Large Telescope Interferometer (VLTI) and H-band low spectral resolution interferometric imaging obser…
Identification of Young Stellar Variables with KELT for K2. I. Taurus Dippers and Rotators
Cargile, Phillip A.; Pepper, Joshua; Stassun, Keivan G. +13 more
One of the most well-studied young stellar associations, Taurus-Auriga, was observed by the extended Kepler mission, K2, in the spring of 2017. K2 Campaign 13 (C13) is a unique opportunity to study many stars in this young association at high photometric precision and cadence. Using observations from the Kilodegree Extremely Little Telescope (KELT…
A gravitationally boosted MUSE survey for emission-line galaxies at z ≳ 5 behind the massive cluster RCS 0224
Kneib, J. -P.; Richard, Johan; Smail, Ian +3 more
We present a Very Large Telescope/Multi Unit Spectroscopic Explorer (MUSE) survey of lensed high-redshift galaxies behind the z = 0.77 cluster RCS 0224-0002. We study the detailed internal properties of a highly magnified (µ ∼ 29) z = 4.88 galaxy seen through the cluster. We detect widespread nebular C IV λλ1548,1551 Å emission from this gal…
Broad-band X-ray spectral analysis of the Seyfert 1 galaxy GRS 1734-292
Harrison, F. A.; Stern, D.; Bianchi, S. +14 more
We discuss the broad-band X-ray spectrum of GRS 1734-292 obtained from non-simultaneous XMM-Newton and NuSTAR (Nuclear Spectroscopic Telescope Array) observations, performed in 2009 and 2014, respectively. GRS1734-292 is a Seyfert 1 galaxy, located near the Galactic plane at z = 0.0214. The NuSTAR spectrum (3-80 keV) is dominated by a primary powe…
The Philae lander mission and science overview
Krüger, Harald; Bibring, Jean-Pierre; Mottola, Stefano +12 more
The Philae lander accomplished the first soft landing and the first scientific experiments of a human-made spacecraft on the surface of a comet. Planned, expected and unexpected activities and events happened during the descent, the touch-downs, the hopping across and the stay and operations on the surface. The key results were obtained during 12-…
EMPIRE: A robust empirical reconstruction of solar irradiance variability
Solanki, S. K.; Yeo, K. L.; Krivova, N. A.
We present a new empirical model of total and spectral solar irradiance (TSI and SSI) variability entitled EMPirical Irradiance REconstruction (EMPIRE). As with existing empirical models, TSI and SSI variability is given by the linear combination of solar activity indices. In empirical models, UV SSI variability is usually determined by fitting th…