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Multiwavelength campaign on Mrk 509. IX. The Galactic foreground
Kaastra, J. S.; Kriss, G. A.; Costantini, E. +5 more
Context. The diffuse gas in and nearby the Milky Way plays an important role in the evolution of the entire Galaxy. It has a complex structure characterized by neutral, weakly and highly ionized gas.
Aims: We probe this gas through the observation of its absorption lines in the high-energy spectra of background sources.
Methods: We used …
Magnetic Flux Density Measured in Fast and Slow Solar Wind Streams
Balogh, A.; Erdős, G.
The radial component of the heliospheric magnetic field vector is used to estimate the open magnetic flux density of the Sun. This parameter has been calculated using observations from the Ulysses mission that covered heliolatitudes from 80°S to 80°N, from 1990 to 2009 and distances from 1 to 5.4 AU, the Advanced Composition Explorer mission at 1 …
Characterizing the limitations to the coupling between Saturn's ionosphere and middle magnetosphere
Ray, L. C.; Galand, M.; Fleshman, B. L. +1 more
Observations of Saturn's ultraviolet and infrared aurora show structures that, when traced along the planetary magnetic field, map to the inner, middle, and outer magnetosphere. From low to high latitudes the structures seen in the UV are the Enceladus footprint, which maps to an equatorial radius of 4 RS (Saturn radii); a diffuse emiss…
On the Edgeworth-Kuiper Belt dust flux to Saturn
Horányi, Mihály; Poppe, Andrew R.
Dust grains originating from the Edgeworth-Kuiper Belt (EKB) are believed to be the dominant species of dust in the outer solar system. These grains, evolving inward from the EKB under the influence of a variety of forces, will encounter the giant planets or their ring and moon systems. At Saturn, this influx drives several physical processes incl…
Herschel observations of a z∼ 2 stellar mass selected galaxy sample drawn from the GOODS NICMOS Survey
Berta, S.; Magnelli, B.; Nordon, R. +28 more
We present a study of the far-infrared (IR) properties of a stellar mass selected sample of 1.5 < z < 3 galaxies with log (M*/M⊙) > 9.5 drawn from the Great Observatories Origins Deep Survey (GOODS) Near Infrared Camera and Multi-Object Spectrometer (NICMOS) Survey (GNS), the deepest H-band Hubble Space Telescope sur…
Deflections of Fast Coronal Mass Ejections and the Properties of Associated Solar Energetic Particle Events
Gopalswamy, N.; Kahler, S. W.; Akiyama, S.
The onset times and peak intensities of solar energetic particle (SEP) events at Earth have long been thought to be influenced by the open magnetic fields of coronal holes (CHs). The original idea was that a CH lying between the solar SEP source region and the magnetic footpoint of the 1 AU observer would result in a delay in onset and/or a decrea…
Observation of High-speed Outflows in Coronal Loops Associated with Photospheric Magnetic Field Evolution
Liu, Y.; Su, J. T.; Liu, S. +2 more
Using SDO/AIA instruments, we provide an EUV observation of two adjacent loop strands (Loops 1 and 2) with one side of their footpoints rooted in the boundaries of active region (AR) NOAA 11158 and the other side in the quiet-Sun regions. The AR footpoints of Loop 1 were located in monopolar magnetic areas and those of Loop 2 in mixed polar areas …
Titan airglow during eclipse
Strobel, D. F.; West, R. A.; Gladstone, G. R. +4 more
Solar XUV photons can provide enough energy to account for the observed nitrogen UV dayglow emissions above 800 km, but a small or sporadic contribution from energetic particles cannot be ruled out. Furthermore, ion production at altitudes deeper than 800 km as inferred from radio occultation cannot be produced by solar XUV stimulation and implies…
Blending of Cepheids in M33
Macri, Lucas M.; Pellerin, Anne; Chavez, Joy M.
A precise and accurate determination of the Hubble constant based on Cepheid variables requires proper characterization of many sources of systematic error. One of these is stellar blending, which biases the measured fluxes of Cepheids and the resulting distance estimates. We study the blending of 149 Cepheid variables in M33 by matching archival …
External triggering of plasmoid development at Saturn
Winglee, R. M.; Paty, C. S.; Harnett, E. M. +1 more
The Cassini spacecraft has encountered multiple plasmoids in Saturn's magnetotail thought to be produced by tail reconnection. However, single spacecraft measurements make it difficult to determine plasmoid size, where they form, the composition, and the geometry of the plasma sheet when plasmoids are produced. This paper examines these issues usi…