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On the Hipparcos Accuracy Using Binary Stars as a Calibration Tool
Docobo, J. A.; Andrade, M.
Stellar binary systems, specifically those that present the most accurate available orbital elements, are a reliable tool to test the accuracy of astrometric observations. We selected all 35 binaries with these characteristics. Our objective is to provide standard uncertainties for the positions and parallaxes measured by Hipparcos relative to thi…
The February 24, 2010 substorm: a refined view involving a pseudobreakup/expansive phase/poleward boundary intensification sequence
Russell, Christopher T.; McPherron, Robert L.; Chu, Xiangning +1 more
A substorm on February 24, 2010 was chosen for study by Connors et al. (Geophys. Res. Lett. 41:4449–4455, 2014) due to simple symmetric subauroral magnetic perturbations observed in North America. It was shown that a substorm current wedge (SCW) three-dimensional current model could represent these perturbations well, gave a reasonable representat…
The discrepancy in the mid-infrared continuum and the features of polycyclic aromatic hydrocarbons for Spitzer and Herschel SWIRE-field galaxies
Wu, Hong; Zhu, Yi-Nan
On the basis of observations by Spitzer and Herschel, we present and analyse the correlations between various monochromatic infrared (IR) luminosities for star-forming galaxies, selected from two northern Spitzer Wide-area InfraRed Extragalactic Survey (SWIRE) fields. The 24- and 70-µm luminosities (L[24] and L[70]), which are dominated by t…
Ultraviolet spectroscopic study of EU UMa and ST LMi from HST and IUE observations
Sanad, M. R.; Bobrowsky, M.
We present the first orbit-resolved ultraviolet spectroscopic observations of the two polar systems EU UMa and ST LMi obtained with the Hubble Space Telescope Faint Object Spectrograph (HST FOS) and International Ultraviolet Explorer (IUE) during their intermediate- and low-luminosity states in the period between 1982 and 2003. Different line prof…
Development of a new Phobos atlas based on Mars Express image data
Oberst, J.; Zubarev, A.; Nadezhdina, I. +6 more
A new Phobos Atlas has been prepared, which includes a variety of thematic maps at various projections and scales, emphasizing dynamic topography, surface multispectral properties, geomorphology, as well as grooves- and crater statistics. The atlas benefits from innovative mapping techniques and recent results from Mars Express image processing: n…
Right-handed circularly polarized dispersive Alfvén wave: Localization and turbulence in solar wind
Sharma, R. P.; Gaur, Nidhi; Sharma, Swati
The elucidation of the turbulent spectrum in the solar wind region in the dispersive range of scales is not yet completely established. The observational analysis of many spacecraft report that the fluctuations on the order of (or smaller scales) proton inertial length λi = c/ω p i show disparity with respect to the large-sca…
Search for ammonia in comet C/2012 S1 (ISON)
Codella, C.; Crovisier, J.; Comoretto, G. +9 more
Comets are uniquely pristine bodies providing unique insights about the formation of our Solar System. In this work, we focus on a dynamically new comet as it enters the inner Solar System for the first time after residing for billion of years in the Oort Cloud. Such comets are particularly important because they are thought to be not differentiat…
Relationship of dayside main layer ionosphere height to local solar time on Mars and implications for solar wind interaction influence
Huang, Qian; Zhang, Jie; Orosei, Roberto +1 more
To understand the influence of solar wind on the daytime main layer ionosphere of Mars, we investigated the local solar time (LST) variations of three characteristic heights of the ionosphere, namely, the heights of the 1 MHz and 1.5 MHz reflection points (i.e., 1.24 × 1010 m-3 and 2.79 × 1010 m-3 isoden…
Rosetta Mission's "7 Hours of Terror" and Philae's Descent
Blanco, Philip
In November 2014 the Rosetta mission to Comet 67P/Churyumov-Gerasimenko made the headlines when its Philae lander completed a successful unpowered descent onto the surface of the comet nucleus after "7 hours of terror" for the mission scientists. 67P's irregular shape and rotation made this task even more challenging. Philae fell almost radially t…
Ionospheric inversion of the Venus Express radio occultation data observed by Shanghai 25 m and New Norcia 35 m antennas
Zhang, Su-Jun; Jian, Nian-Chuan; Li, Jin-Ling +3 more
Electron density profiles of Venus' ionosphere are inverted from the Venus Express (VEX) one-way open-loop radio occultation experiments carried out by the Shanghai 25 m antenna from November 2011 to January 2012 at solar maximum conditions and by the New Norcia 35 m antenna from August 2006 to June 2008 at solar intermediate conditions. The elect…