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The three-micron spectral feature of the Saturnian haze: Implications for the haze composition and formation process
Moses, J. I.; Courtin, R.; Kim, S. J. +3 more
We retrieve a 3.4-µm spectral feature pertaining to the Saturnian haze from Cassini/VIMS Procyon occultation data obtained at 12 different altitudes from approximately 0.7 to 0.0018 mbar (Nicholson et al., 2006; Bellucci, 2008; Bellucci et al., 2009). The occultation occurred at 55°N latitude, at the edge of the “polar hood” region, where th…
Counterrotation in Magnetocentrifugally Driven Jets and Other Winds
Tsinganos, K.; Cayatte, V.; Lima, J. J. G. +2 more
Rotation measurement in jets from T Tauri stars is a rather difficult task. Some jets seem to be rotating in a direction opposite to that of the underlying disk, although it is not yet clear if this affects the totality or part of the outflows. On the other hand, Ulysses data also suggest that the solar wind may rotate in two opposite ways between…
A volcanotectonic survey of Ascraeus Mons, Mars
Byrne, Paul K.; Murray, John B.; van Wyk de Vries, Benjamin +1 more
Ascraeus Mons is one of the largest volcanoes on Mars. It is replete with well-preserved features that can be used to understand its volcanotectonic evolution. Previous studies of this volcano focused on specific features, and were limited by the quality and coverage of contemporary data. Our objective is to review and enhance the existing develop…
On the Distribution of Quiet-Sun Magnetic Fields at Different Heliocentric Angles
Katsukawa, Y.; Orozco Suárez, D.
This paper presents results from the analysis of high signal-to-noise ratio spectropolarimetric data taken at four heliocentric angles in quiet-Sun internetwork regions with the Hinode satellite. First, we find that the total circular and total linear polarization signals vary with heliocentric angle, at least for fields with large polarization si…
The role of the inner tail to midtail plasma sheet in channeling solar wind power to the ionosphere
Dandouras, I.; André, M.; Hamrin, M. +5 more
In this article we use Cluster power density (E · J) data from 2001, 2002, and 2004 to investigate energy conversion and transfer in the plasma sheet. We show that a southward IMF Bz is favorable for plasma sheet energy conversion, and that there is an increased particle and Poynting flux toward the Earth at times when Cluster observes …
The Globular Cluster Populations of Giant Galaxies: Mosaic Imaging of Five Moderate-luminosity Early-type Galaxies
Rhode, Katherine L.; Hargis, Jonathan R.
This paper presents results from wide-field imaging of the globular cluster (GC) systems of five intermediate-luminosity (MV ~ -21 to -22) early-type galaxies. The aim is to accurately quantify the global properties of the GC systems by measuring them out to large radii. We obtained BVR imaging of four lenticular galaxies (NGC 5866, NGC…
Searching for evidence of hydrothermal activity at Apollinaris Mons, Mars
Markiewicz, Wojciech J.; Heggy, Essam; Marzo, Giuseppe A. +5 more
A multidisciplinary approach involving various remote sensing instruments is used to investigate Apollinaris Mons, a prominent volcano on Mars, as well as the surrounding plains for signs of prolonged hydrologic and volcanic, and possibly hydrothermal activity. The main findings include (1) evidence from laser altimetry indicating the large thickn…
Cluster 77 in NGC 4449: The Nucleus of a Satellite Galaxy Being Transformed into a Globular Cluster?
Tosi, M.; van der Marel, R. P.; Aloisi, A. +2 more
We report the discovery in our Hubble Space Telescope Advanced Camera for Surveys B, V, and I images of NGC 4449 of a globular cluster (GC) which appears associated with two tails of blue stars. The cluster is massive (M ~ 1.7 × 106 M ⊙) and highly flattened (epsilon ~ 0.24). From the color-magnitude diagrams of the resolved …
Edge detection applied to Cassini images reveals no measurable displacement of Ontario Lacus' margin between 2005 and 2010
Sotin, Christophe; Barnes, Jason W.; Le Mouélic, Stéphane +8 more
Ontario Lacus is thus far the largest flat-floored topographic depression of Titan's southern hemisphere interpreted as a permanent or ephemeral lake. From 2005 to 2010, it was imaged several times and at various wavelengths by ISS, VIMS and RADAR instruments onboard Cassini's spacecraft. We analyze the position and uncertainty of Ontario Lacus' m…
Doppler shift of hot coronal lines in a moss area of an active region
Solanki, S. K.; Teriaca, L.; Wiegelmann, T. +2 more
The moss is the area at the footpoint of the hot (3 to 5 MK) loops forming the core of the active region where emission is believed to result from the heat flux conducted down to the transition region from the hot loops. Studying the variation of Doppler shift as a function of line formation temperatures over the moss area can give clues on the he…