Search Publications
Solar Sources of Interplanetary Coronal Mass Ejections During the Solar Cycle 23/24 Minimum
Mierla, M.; Zhukov, A. N.; Rodriguez, L. +3 more
We examine solar sources for 20 interplanetary coronal mass ejections (ICMEs) observed in 2009 in the near-Earth solar wind. We performed a detailed analysis of coronagraph and extreme ultraviolet (EUV) observations from the Solar Terrestrial Relations Observatory (STEREO) and Solar and Heliospheric Observatory (SOHO). Our study shows that the cor…
Solar Magnetized Tornadoes: Rotational Motion in a Tornado-like Prominence
Gan, Weiqun; Temmer, Manuela; Veronig, Astrid +5 more
Su et al. proposed a new explanation for filament formation and eruption, where filament barbs are rotating magnetic structures driven by underlying vortices on the surface. Such structures have been noticed as tornado-like prominences when they appear above the limb. They may play a key role as the source of plasma and twist in filaments. However…
The location of magnetic reconnection at Saturn's magnetopause: A comparison with Earth
Frahm, R.; Masters, A.; Fuselier, S. A. +4 more
Data from the Cassini Electron Spectrometer are used to investigate the location of magnetic reconnection at Saturn's magnetopause. Heated, streaming electron distributions in the boundary layer on the magnetosheath side of the magnetopause are evidence of reconnection and an open magnetopause. A model for the location of reconnection is used to c…
Black hole accretion preferentially occurs in gas-rich galaxies*
Lutz, D.; Maiolino, R.; Pozzi, F. +15 more
We have investigated the gas content of a sample of several hundred AGN host galaxies at z < 1 and compared it with a sample of inactive galaxies, matched in bins of stellar mass and redshift. Gas masses have been inferred from the dust masses, obtained by stacked Herschel far-IR and sub-mm data in the GOODS and COSMOS fields, under reasonable …
Evidence for Active Galactic Nucleus Feedback in the Broad Absorption Lines and Reddening of Mrk 231
Gallagher, Sarah C.; Terndrup, Donald M.; Leighly, Karen M. +3 more
We present the first J-band spectrum of Mrk 231, which reveals a large He I* λ10830 broad absorption line with a profile similar to that of the well-known Na I broad absorption line. Combining this spectrum with optical and UV spectra from the literature, we show that the unusual reddening noted by Veilleux et al. is explained by a reddening curve…
Thermal Structure of Current Sheets and Supra-arcade Downflows in the Solar Corona
Reeves, Katharine K.; Hanneman, Will J.
After the peak intensity of many large solar flares, magnetic and thermodynamic processes give rise to a phenomenon known as supra-arcade downflows (SADs). SADs are sunward flowing density depletions, often observed in post-flare plasma sheets. Some models have suggested that the plasma in the dark lanes is heated to temperatures of 20-80 MK, whic…
Steps to reconcile inflationary tensor and scalar spectra
Hu, Wayne; Miranda, Vinícius; Adshead, Peter
The recent BICEP2 B-mode polarization determination of an inflationary tensor-scalar ratio r=0.2-0.05+0.07 is in tension with simple scale-free models of inflation due to a lack of a corresponding low multipole excess in the temperature power spectrum which places a limit of r0.002<0.11 (95% C.L.) on such models. Single-field inflati…
Analysis of a new geomorphological inventory of landslides in Valles Marineris, Mars
Komatsu, Goro; Brunetti, Maria Teresa; Guzzetti, Fausto +5 more
We completed a systematic mapping of landslides in a 105km2 area in Tithonium and Ius Chasmata, Valles Marineris, Mars, where landslides are abundant. Using visual interpretation of medium to high-resolution optical images, we mapped and classified the geometry of 219 mass wasting features, including rock slides, complex/comp…
Transit Confirmation and Improved Stellar and Planet Parameters for the Super-Earth HD 97658 b and its Host Star
Queloz, D.; Demory, B. -O.; Ehrenreich, D. +15 more
Super-Earths transiting nearby bright stars are key objects that simultaneously allow for accurate measurements of both their mass and radius, providing essential constraints on their internal composition. We present here the confirmation, based on Spitzer transit observations, that the super-Earth HD 97658 b transits its host star. HD 97658 is a …
Statistical Analysis of Large-Scale EUV Waves Observed by STEREO/EUVI
Temmer, M.; Veronig, A. M.; Vršnak, B. +3 more
We statistically analyzed the kinematical evolution and wave pulse characteristics of 60 strong large-scale EUV wave events that occurred during January 2007 to February 2011 with the STEREO twin spacecraft. For the start velocity, the arithmetic mean is 312±115 km s−1 (within a range of 100 - 630 km s−1). For the mean (linea…