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Mode Conversion of a Solar Extreme-ultraviolet Wave over a Coronal Cavity
Dai, Yu; Zong, Weiguo
We report on observations of an extreme-ultraviolet (EUV) wave event in the Sun on 2011 January 13 by Solar Terrestrial Relations Observatory and Solar Dynamics Observatory in quadrature. Both the trailing edge and the leading edge of the EUV wave front in the north direction are reliably traced, revealing generally compatible propagation velociti…
Proper motions of collimated jets from intermediate-mass protostars in the Carina Nebula
Smith, Nathan; Bally, John; Reiter, Megan +1 more
We present proper motion measurements of 37 jets and HH objects in the Carina Nebula measured in two epochs of H α images obtained ∼10 yr apart with Hubble Space Telescope/Advanced Camera for Surveys (ACS). Transverse velocities in all but one jet are faster than ≳ 25 km s-1, confirming that the jet-like H α features identified in the f…
Statistical study of Saturn's auroral electron properties with Cassini/UVIS FUV spectral images
Lamy, L.; Grodent, D.; Radioti, A. +3 more
About 2000 FUV spectra of different regions of Saturn's aurora, obtained with Cassini/UVIS from December 2007 to October 2014 have been examined. Two methods have been employed to determine the mean energy <;E> of the precipitating electrons. The first is based on the absorption of the auroral emission by hydrocarbons and the second uses the…
Cosmological searches for a noncold dark matter component
Mena, Olga; Gariazzo, Stefano; Diamanti, Roberta +1 more
We explore an extended cosmological scenario where the dark matter is an admixture of cold and additional noncold species. The mass and temperature of the noncold dark matter particles are extracted from a number of cosmological measurements. Among others, we consider tomographic weak lensing data and Milky Way dwarf satellite galaxy counts. We al…
A Sun-to-Earth Analysis of Magnetic Helicity of the 2013 March 17-18 Interplanetary Coronal Mass Ejection
Gopalswamy, Nat; Akiyama, Sachiko; Yashiro, Seiji +4 more
We compare the magnetic helicity in the 2013 March 17-18 interplanetary coronal mass ejection (ICME) flux rope at 1 au and in its solar counterpart. The progenitor coronal mass ejection (CME) erupted on 2013 March 15 from NOAA active region 11692 and is associated with an M1.1 flare. We derive the source region reconnection flux using the post-eru…
Periodic eclipses of the young star PDS 110 discovered with WASP and KELT photometry
Kochanek, C. S.; Stanek, K. Z.; Shappee, B. J. +28 more
We report the discovery of eclipses by circumstellar disc material associated with the young star PDS 110 in the Ori OB1a association using the SuperWASP and Kilodegree Extremely Little Telescope surveys. PDS 110 (HD 290380, IRAS 05209-0107) is a rare Fe/Ge-type star, an ∼10 Myr-old accreting intermediate-mass star showing strong infrared excess (…
Characterizing the evolving K -band luminosity function using the UltraVISTA, CANDELS and HUDF surveys
Mortlock, Alice; Dunlop, James S.; McLure, Ross J. +5 more
We present the results of a new study of the K-band galaxy luminosity function (KLF) at redshifts z ≤ 3.75, based on a nested combination of the UltraVISTA, Cosmic Assembly Near-infrared Deep Legacy Extragalactic Survey and HUDF surveys. The large dynamic range in luminosity spanned by this new data set (3-4 dex over the full redshift range) is su…
Feedback of atomic jets from embedded protostars in NGC 1333
Güdel, Manuel; Dionatos, Odysseas
Context. The feedback of star formation to the parent cloud is conventionally examined through the study of molecular outflows. Little is known, however, about the effect that atomic ejecta tracing fast shocks can have on small scales or on global cloud properties.
Aims: Our immediate objective is to study the morphology of protostellar eject…
Winds in the Middle Cloud Deck From the Near-IR Imaging by the Venus Monitoring Camera Onboard Venus Express
Fedorova, A. A.; Ignatiev, N. I.; Markiewicz, W. J. +4 more
For more than 8 years the Venus Monitoring Camera (VMC) onboard the Venus Express orbiter performed continuous imaging of the Venus cloud layer in UV, visible and near-IR filters. We applied the correlation approach to sequences of the near-IR images at 965 nm to track cloud features and determine the wind field in the middle and lower cloud (49-5…
Seismic imaging of the Sun's far hemisphere and its applications in space weather forecasting
Lindsey, Charles; Braun, Douglas
The interior of the Sun is filled acoustic waves with periods of about 5 min. These waves, called "p modes," are understood to be excited by convection in a thin layer beneath the Sun's surface. The p modes cause seismic ripples, which we call "the solar oscillations." Helioseismic observatories use Doppler observations to map these oscillations, …