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Solar wind structure in the outer heliosphere
Liu, Y.; Wang, C.; Richardson, J. D.
A solar wind parcel evolves as it moves outward, interacting with the solar wind plasma ahead of and behind it and with the interstellar neutrals. This structure varies over a solar cycle as the latitudinal speed profile and current sheet tilt change. We model the evolution of the solar wind with distance, using inner heliosphere data to predict p…
Geomorphological evidence of water level changes in Nepenthes Mensae, Mars
de Pablo, Miguel Ángel; Pacifici, Andrea
In the western sector of Nepenthes Mensae, Mars, there are some geomorphological features that could be related to a standing water sheet in the area, such as fluvial terraces, deltas and shorelines. A detailed analysis of these features reveals two variations in water level, probably related to tectonic processes, as suggested by the existence of…
Hydrodynamical Simulations of the Barred Spiral Galaxy NGC 6782
Lin, Lien-Hsuan; Yuan, Chi; Buta, R.
NGC 6782 is an early-type barred spiral galaxy exhibiting a rich and complex morphology with multiple ring patterns. To provide a physical understanding of its structure and kinematical properties, two-dimensional hydrodynamical simulations have been carried out. Numerical calculations reveal that the striking features in NGC 6782 can be reproduce…
Predicting interplanetary shock arrivals at Earth, Mars, and Venus: A real-time modeling experiment following the solar flares of 5-14 December 2006
Barabash, S.; Lundin, R.; Futaana, Y. +12 more
A 3-D, kinematic, solar wind model (Hakamada-Akasofu-Fry version 2 (HAFv.2)) is used to predict interplanetary shock arrivals at Venus, Earth, and Mars during a sequence of significant solar events that occurred in the interval 5-14 December 2006. Mars and Venus were on the opposite side of the Sun from Earth during this period. The shocks from th…
Young Stellar Objects in the Large Magellanic Cloud: N63 and N180 H II Regions
Gruendl, R. A.; Chu, Y. -H.; Caulet, Adeline
We used Spitzer infrared observations to find the young stars of two H II regions in the Large Magellanic Cloud, N63 and N180. The young stellar object (YSO) candidates were identified in each nebula by means of color-color, color-magnitude diagrams, and the shapes of their spectral energy distributions (SEDs). The most luminous YSOs are found nea…
Performance of an Imaging Fourier Transform Spectrometer with Photoconductive Detector Arrays: An Application for the AKARI Far-Infrared Instrument
Nakagawa, Takao; Shirahata, Mai; Doi, Yasuo +10 more
We have developed an imaging Fourier transform spectrometer (FTS) for space-based far-infrared astronomical observations. The FTS employs newly developed photoconductive detector arrays with acapacitive trans-impedance amplifier, which makes the FTS acompletely unique instrument. The FTS was installed as afunction of the far-infrared instrument (F…
IRAC Excess in Distant Star-Forming Galaxies: Tentative Evidence for the 3.3 µm Polycyclic Aromatic Hydrocarbon Feature?
Magnelli, B.; Elbaz, D.; Morrison, G. +3 more
We present evidence for the existence of an IRAC excess in the spectral energy distribution (SED) of five galaxies at 0.6 < z < 0.9 and one galaxy at z = 1.7. These six galaxies, located in the Great Observatories Origins Deep Survey field (GOODS-N), are star-forming since they present strong 6.2, 7.7, and, 11.3 µm polycyclic aromatic …
Interferometric Studies of the Extreme Binary epsilon Aurigae: Pre-Eclipse Observations
Stencel, Robert E.; Creech-Eakman, Michelle; Hart, Alexa +3 more
We report new and archival K-band interferometric uniform disk diameters obtained with the Palomar Testbed Interferometer for the eclipsing binary star epsilon Aurigae, in advance of the start of its eclipse in 2009. The observations were intended to test whether low-amplitude variations in the system are connected with the F supergiant star (prim…
Spatial variability of carbon monoxide in Venus' mesosphere from Venus Express/Visible and Infrared Thermal Imaging Spectrometer measurements
Irwin, P. G. J.; Drossart, P.; Piccioni, G. +6 more
Observations of Venus' mesosphere by the Visible and Infrared Thermal Imaging Spectrometer (VIRTIS)-M instrument of Venus Express have been used to investigate the spatial distribution of CO above Venus' nightside cloud tops by fitting the CO absorption in the (1-0) CO band around 4.7 µm. We find little spatial variation in the abundance of …
Exospheric heating by pickup ions at Titan
Ip, W. -H.; Kopp, A.; Tseng, W. -L.
Titan has a very extensive atmosphere and exosphere which interact strongly with the corotating magnetospheric plasma. Some of the new pickup ions created in the vicinity of the exosphere will re-impact the upper atmosphere causing additional energy input. Previous investigations of the atmospheric collisional interaction of the pickup ions have g…