Search Publications
Remote sensing and terramechanics study of Mars using orbital and rover data sets
Lichtenberg, Kimberly Ann
Orbital observations, rover-based remote-sensing and in-situ observations, and terramechanics modeling can be used collaboratively to examine the interplay between material properties, scientific setting, and mobility issues facing rovers on other worlds. In this thesis, these types of observations are used concurrently to identify the surface pro…
Automatic alignment of multi-temporal images of planetary nebulae using local optimization
Hajian, Arsen R.; Kazemzadeh, Farnoud
Automatic alignment of time-separated astronomical images have historically proven to be difficult. The main reason for this difficulty is the amount of sporadic and unpredictable noise associated with astronomical images. A few examples of these effects are: image distortion due to optics, cosmic ray hits, transient background sources (super nova…
Sublimation-driven evolution of the local radius and the moment of inertia of short-period comets
Dziak-Jankowska, Beata
This article is a continuation of the previous one considering the evolution of a long-period comet. The changes of the local radius and the moment of inertia as well as the orientation of the rotation axis are calculated. With reference to the previous model, the time-dependent orbital parameters are introduced. The procedure of sublimation-drive…
Physical mechanisms of the spectral variability of α Orionis with IUE
Sanad, M. R.
We present a spectroscopic study of Mg II k&h emission lines in the 2000-3000 Å region of 91 high resolution IUE spectra of α Orionis obtained during the period 1978-1996. There are absorption and emission components on the blue sides of the k&h emission lines, these components may be coming from the dust envelope located inside the extend…
Waves at the plasma frequency inside magnetic holes: STEREO and Cluster observations
Bale, S. D.; Goetz, K.; Soucek, J. +2 more
Magnetic isolated large amplitude depressions in the interplanetary magnetic field are commonly observed in the solar wind. Some of these magnetic structures are accompanied by bursts of electrostatic waves close to electron plasma frequency. Combining STEREO/WAVES and IMPACT data we are able to accurately localize the waves emission. We show that…
Large dust particles around comets
Moreno, F.; Ortiz, J. L.; Molina, A. +1 more
A expression to estimate the maximum diameter, dmax, of the boulders ejected from comets is shown. Special attention is devoted to discuss the influence of the nucleus rotation in the determination of the size of the largest particles. An increase of the dmax about 40% is found for comets spinning with a six hours period. Particularly, these expre…
Preliminary analysis of the AKARI FIS BSC
Tamura, Motohide; Kawamura, Akiko; Marton, Gábor +3 more
We present a preliminary analysis of AKARI Far-Infrared Surveyor Bright Source Catalog. The AKARI mission collected data on 63370 bright IR sources. Galactic spatial distribution of different flux quality types was studied. The surface density shows correlation with already known places of IR bright galactic regions. Difference between the spatial…
Correction to “Influence of an extended source on goniopolarimetry (or direction finding) with Cassini and Solar Terrestrial Relations Observatory radio receivers”
Cecconi, B.
Abstract Available from http://www.agu.org
A scenario of planet erosion by coronal radiation (Corrigendum)
Eiroa, C.; Ribas, I.; Solano, E. +4 more
In the notes to Table 1, a unit conversion was incorrect. The text should read 1 MJ Gyr-1 = 6.02e+13 g s-1. As a consequence in the 3rd paragraph of Sect. 3, the mass loss taking place in τ Boo b should be dot M_X = 0.011 MJ Gyr-1 for ρ = 1 g cm-3, or dot M_X = 3.4 M⊕ Gyr…
Mid-Tail Magnetic Reconnection Triggering Substorm: A Case Study
Luo, Hao; Wang, Rong-Sheng; Du, Ai-Min +2 more
Onset of a substorm is closely correlated with the current disruption in the near-Earth magnetotail, about 6 8 RE and magnetic reconnection in the middle magnetotail, around 20 30 RE. It is vital to understand the onset of a substorm by studying the time series among polar expansion of aurora, current disruption and magnetic reconnection. In this …