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Scalings, Cascade and Intermittency in Solar Wind Turbulence
Carbone, Vincenzo
Investigating in situ fluctuations in the interplanetary space, offers us a unique challenge to study scaling properties in a turbulent medium which cover a wide range of scales. This includes not only the inertial range, where turbulence can be described within a fluid-like approach, but also the high-frequency region, where a kinetic approach is…
Nonaxisymmetric Anisotropy of Solar Wind Turbulence as a Direct Test for Models of Magnetohydrodynamic Turbulence
Chapman, S. C.; Turner, A. J.; Gogoberidze, G.
Single point spacecraft observations of the turbulent solar wind flow exhibit a characteristic nonaxisymmetric anisotropy that depends sensitively on the perpendicular power spectral exponent. We use this nonaxisymmetric anisotropy as a function of wave vector direction to test models of MHD turbulence. Using Ulysses magnetic field observations in…
Hubble Space Telescope FUV Spectra of the Post-common-envelope Hyades Binary V471 Tauri
Bond, Howard E.; Sion, Edward M.; Godon, Patrick +4 more
We have carried out an analysis of the Hubble Space Telescope (HST)/STIS archival spectra of the magnetic white dwarf (WD) in the Hyades eclipsing-spectroscopic, post-common-envelope binary V471 Tauri, time resolved on the orbit and on the X-ray rotational phase of the magnetic WD. An HST/STIS spectrum obtained during primary eclipse reveals a hos…
Empirical Estimates of Martian Surface Pressure in Support of the Landing of Mars Science Laboratory
Withers, Paul
The aim of this work is to develop an empirical expression for diurnal mean martian surface pressure in support of the landing of Mars Science Laboratory. We evaluate the consistency of surface pressure measurements from four landers, Viking Lander 1, Viking Lander 2, Mars Pathfinder, and Phoenix, and one radio occultation experiment, Mars Global …
Observations of oxygen ions in the dayside magnetosheath associated with southward IMF
Nilsson, H.; Slapak, R.; Eriksson, A. +1 more
We present a case study of high energy oxygen ions (O+) observed in the dayside terrestrial magnetosheath, in the southern hemisphere. It is shown that the presence of O+ is strongly correlated to the IMF direction: O+ is observed only for Bz < 0. Three satellites observe O+ immediately at …
Solar flare hard X-ray spikes observed by RHESSI: a case study
Xu, Y.; Qiu, J.; Cheng, J. X. +2 more
Context. Fast-varying hard X-ray spikes of subsecond time scales were discovered by space telescopes in the 70s and 80s, and are also observed by the Ramaty High Energy Solar Spectroscopic Imager (RHESSI). These events indicate that the flare energy release is fragmented.
Aims: In this paper, we analyze hard X-ray spikes observed by RHESSI to…
Two Pseudobulges in the "Boxy Bulge" Galaxy NGC 5746
Kormendy, John; Barentine, John C.
Galaxy formation and growth under the ΛCDM paradigm is expected to proceed in a hierarchical, bottom-up fashion by which small galaxies grow into large galaxies; this mechanism leaves behind large "classical bulges" kinematically distinct from "pseudobulges" grown by internal, secular processes. We use archival data (Spitzer Space Telescope 3.6 &m…
Spatially Resolved Spectroscopy of the Globular Cluster RZ 2109 and the Nature of its Black Hole
Salzer, John J.; Kundu, Arunav; Zepf, Stephen E. +7 more
We present optical Hubble Space Telescope/Space Telescope Imaging Spectrograph (HST/STIS) spectroscopy of RZ 2109, a globular cluster (GC) in the elliptical galaxy NGC 4472. This GC is notable for hosting an ultraluminous X-ray source as well as associated strong and broad [O III] λλ4959, 5007 emission. We show that the HST/STIS spectroscopy spati…
Tectonic lineament mapping of the Thaumasia Plateau, Mars: Comparing results from photointerpretation and a semi-automatic approach
Di Achille, Gaetano; Vaz, David A.; Barata, Maria Teresa +1 more
Photointerpretation is the technique generally used to map and analyze the tectonic features existent on Mars surface. In this study we compare qualitatively and quantitatively two tectonic maps based on the interpretation of satellite imagery and a map derived semi-automatically. The comparison of the two photointerpreted datasets allowed us to i…
Gemini Spectroscopic Survey of Young Star Clusters in Merging/Interacting Galaxies. IV. Stephan's Quintet
Charlton, Jane C.; Konstantopoulos, Iraklis S.; Trancho, Gelys +4 more
We present a spectroscopic survey of 21 young massive clusters and complexes and one tidal dwarf galaxy (TDG) candidate in Stephan's Quintet, an interacting compact group of galaxies. All of the selected targets lie outside the main galaxies of the system and are associated with tidal debris. We find clusters with ages between a few and 125 Myr an…