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A likely runaway star cluster in the outer disc of the Large Magellanic Cloud
Grebel, Eva K.; Piatti, Andrés E.; Salinas, Ricardo
We present results from photometric and spectroscopic data obtained with SOAR and Gemini observatory facilities in the field of a recently discovered star cluster. The cluster, projected towards the Eastern side of the outer disc of the Large Magellanic Cloud (LMC), was originally placed nearly 10 kpc behind the LMC with an age and metallicity typ…
Determination of Plasma, Pickup Ion, and Suprathermal Particle Spectrum in the Solar Wind Frame of Reference
Wimmer-Schweingruber, R. F.; Pogorelov, N. V.; von Steiger, R. +4 more
Particle spectra directly measured by a plasma or low-energy particle experiment on spacecraft often contain instrumental effects due to a limited field of view or angular resolution. It is because the particle distribution function at low energies is highly anisotropic in the spacecraft frame of reference, in which the measurements are made. In t…
Origin of Phobos grooves: Testing the Stickney Crater ejecta model
Head, James W.; Ramsley, Kenneth R.
The model of Wilson and Head (1989, 2005, 2015) interprets the grooves of Phobos as the product of sliding, rolling, and bouncing ejecta boulders from the Stickney Crater impact. To test the model of Wilson and Head (1989, 2005, 2015) we apply a dynamical physics simulation to a three-dimensional shape model of Phobos and systematically assess six…
Currents Associated With Saturn's Intra-D Ring Azimuthal Field Perturbations
Dougherty, M. K.; Cowley, S. W. H.; Bunce, E. J. +4 more
During the final 22 full revolutions of the Cassini mission in 2017, the spacecraft passed at periapsis near the noon meridian through the gap between the inner edge of Saturn's D ring and the denser layers of the planet's atmosphere, revealing the presence of an unanticipated low-latitude current system via the associated azimuthal perturbation f…
Galaxy properties derived with spectral energy distribution fitting in the Hawaii-Hubble Deep Field-North
Xue, Yong-Quan; Gao, Fang-You; Li, Jun-Yao
We compile multi-wavelength data from ultraviolet to infrared (IR) bands as well as redshift and source-type information, for a large sample of 178 341 sources in the Hawaii-Hubble Deep Field-North field. A total of 145 635 sources among the full sample are classified/treated as galaxies and have redshift information available. We derive physical …
Solar flares observed by Rosetta at comet 67P/Churyumov-Gerasimenko
Henri, P.; Edberg, N. J. T.; Simon Wedlund, C. +6 more
Context. The Rosetta spacecraft made continuous measurements of the coma of comet 67P/Churyumov-Gerasimenko (67P) for more than two years. The plasma in the coma appeared very dynamic, and many factors control its variability.
Aims: We wish to identify the effects of solar flares on the comet plasma and also their effect on the measurements b…
Multiwavelength Stereoscopic Observation of the 2013 May 1 Solar Flare and CME
Krucker, Säm; Masuda, Satoshi; Mitrofanov, Igor +7 more
A M-class behind-the-limb solar flare on 2013 May 1 (SOL2013-05-01T02:32), accompanied by a (∼400 km s-1) coronal mass ejection (CME), was observed by several space-based observatories with different viewing angles. We investigated the RHESSI-observed occulted hard X-ray (HXR) emissions that originated at least 0.1 {R}{{S}} a…
Faint solar analogues at the limit of no reddening. Precise atmospheric parameters from moderate low-resolution spectra
Porto de Mello, G. F.; Lorenzo-Oliveira, D.; Giribaldi, R. E. +2 more
Context. The flux distribution of solar analogues is required for calculating the spectral albedo of solar system bodies such as asteroids and trans-Neptunian objects. Ideally a solar analogue should be comparatively faint as the target of interest, but very few analogues fainter than V = 9 mag have been identified so far. Only atmospheric paramet…
Heavy Ion Flows in the Upper Ionosphere of the Venusian North Pole
Fedorov, A.; Barabash, S.; Futaana, Y. +5 more
We investigate the heavy ion density and velocity in the Venusian upper ionosphere near the North Pole, using the Ion Mass Analyzer, a part of the Analyzer of Space Plasmas and Energetic Atoms 4, together with the magnetic field instruments on Venus Express. The measurements were made during June-July 2014, covering the aerobraking campaign with l…
Can High-Mode Magnetohydrodynamic Waves Propagating in a Spinning Macrospicule Be Unstable Due to the Kelvin-Helmholtz Instability?
Zhelyazkov, I.; Chandra, R.
We investigate the conditions at which high-mode magnetohydrodynamic (MHD) waves propagating in a spinning solar macrospicule can become unstable with respect to the Kelvin-Helmholtz instability (KHI). We consider the macrospicule as a weakly twisted cylindrical magnetic flux tube moving along and rotating around its axis. Our study is based on th…