Search Publications
The Solar Minimum Corona from Differential Emission Measure Tomography
Frazin, Richard A.; Vásquez, Alberto M.; Manchester, Ward B., IV
We present results derived from a dual-spacecraft tomographic reconstruction of the solar corona's three-dimensional (3D) extreme ultraviolet (EUV) emissivity. We use simultaneously taken STEREO A and B spacecraft EUVI images from Carrington rotation 2077 (UT 2008 November 20 06:56 through UT December 17 14:34). During this period, the spacecraft …
Martian rifts: Structural geology and geophysics
Hauber, Ernst; Grott, Matthias; Kronberg, Peter
Large extensional tectonic surface structures on Mars are investigated on the basis of image and topographic data. These features have lengths of up to 1400 km, typical widths of tens of kilometers, and depths of up to 3000 m. Their structural architecture is characterized by segmentation with changing style, the development of asymmetric basins w…
Generation of whistler mode emissions in the inner magnetosphere: An event study
Pickett, J. S.; Winningham, D.; Fazakerley, A. N. +8 more
On July 24, 2003, when the Cluster 4 satellite crossed the magnetic equator at about 4.5 RE radial distance on the dusk side (∼15 MLT), whistler wave emissions were observed below the local electron gyrofrequency (fce) in two bands, one band above one-half the gyrofrequency (0.5fce) and the other band below 0.5f
Fermi Large Area Telescope Observations of PSR J1836+5925
Caraveo, P. A.; Frailis, M.; Orlando, E. +179 more
The discovery of the γ-ray pulsar PSR J1836+5925, powering the formerly unidentified EGRET source 3EG J1835+5918, was one of the early accomplishments of the Fermi Large Area Telescope (LAT). Sitting 25° off the Galactic plane, PSR J1836+5925 is a 173 ms pulsar with a characteristic age of 1.8 million years, a spindown luminosity of 1.1 × 103…
Galaxy Evolution in a Complex Environment: A Multi-wavelength Study of HCG 7
Hornschemeier, A. E.; Konstantopoulos, I. S.; Mendes de Oliveira, C. +17 more
The environment where galaxies are found heavily influences their evolution. Close groupings, like the ones in the cores of galaxy clusters or compact groups, evolve in ways far more dramatic than their isolated counterparts. We have conducted a multi-wavelength study of Hickson Compact Group 7 (HCG 7), consisting of four giant galaxies: three spi…
Optical identification of XMM sources in the Canada-France-Hawaii Telescope Legacy Survey
Petitjean, Patrick; Stalin, C. S.; Schwope, A. +3 more
We present optical spectroscopic identifications of X-ray sources in ~3 deg2 of the XMM-Large Scale Structure survey (XMM-LSS), also covered by the Canada-France-Hawaii Telescope Legacy Survey (CFHTLS), obtained with the AAOmega instrument at the Anglo-Australian Telescope. In a flux-limited sample of 829 point-like sources in the optic…
A First Glimpse Into the Far-IR Properties of High-z UV-selected galaxies: Herschel/PACS Observations of z ~ 3 LBGs
Berta, S.; Magnelli, B.; Nordon, R. +33 more
We present first insights into the far-IR properties for a sample of IRAC and MIPS 24 µm detected Lyman break galaxies (LBGs) at z ~ 3, as derived from observations in the northern field of the Great Observatories Origins Survey (GOODS-N) carried out with the PACS instrument on board the Herschel Space Observatory. Although none of our galax…
Characterization of the slow wind in the outer corona
Antonucci, Ester; Riley, Pete; Linker, Jon A. +3 more
The study concerns the streamer belt observed at high spectral resolution during the minimum of solar cycle 23 with the Ultraviolet Coronagraph Spectrometer (UVCS) onboard SOHO. On the basis of a spectroscopic analysis of the O VI doublet, the solar wind plasma parameters are inferred in the extended corona. The analysis accounts for the coronal m…
A general circulation model ensemble study of the atmospheric circulation of Venus
Lee, C.; Richardson, M. I.
The response of three numerical model dynamical cores to Venus-like forcing and friction is described in this paper. Each dynamical core simulates a super-rotating atmospheric circulation with equatorial winds of 35 ± 10 m/s, maintained by horizontally propagating eddies leaving the equatorial region and inducing a momentum convergence there. We d…
Thermal structure of Venusian nighttime mesosphere as observed by VIRTIS-Venus Express
Drossart, P.; Piccioni, G.; Lebonnois, S. +5 more
The mapping IR channel of the Visual and Infrared Thermal Imaging Spectrometer (VIRTIS-M) on board the Venus Express spacecraft observes the CO2 band at 4.3 µm at a spectral resolution adequate to retrieve the atmospheric temperature profiles in the 65-96 km altitude range. Observations acquired in the period June 2006 to July 200…