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Quantitative assessment of water content and mineral abundances at Gale crater on Mars with orbital observations
Liu, Yang; Zou, Yongliao; Stachurski, Federico +1 more
Context. The information of water content can help to improve atmospheric and climate models, and thus provide a better understanding of the past and present role of water and aqueous alteration on Mars. Mineral abundances can provide unique constraints on their formation environments and thus also on the geological and climate evolution of Mars. …
Revised Orbital Parameters of Beaming Eclipsing Binary System HV Cnc from Kepler Photometry
Gürol, Birol; Gökay, Gökhan; Özdemir, Sacit
High precision photometry gathered from Kepler database and radial velocity measurements of the HV Cnc system found in the literature were simultaneously analyzed by the Wilson-Devinney (WD) code to better understand system parameters. Some physical quantities needed by the WD code in iterations, such as limb darkening coefficients, Kurucz's model…
Comparative Study of a Sunspot at Two Different Instances of Time
Hamedivafa, Hashem
We investigate the evolutionary effects on the brightness of a sunspot as well as on the properties of its fine-structures using two sets of time series of G-band images of a single sunspot in NOAA 10944 recorded at two symmetric locations on the solar disc by Hinode/SOT (Solar Optical Telescope). The second time series (phase W) was recorded 2.5 …
Spectrum of imbalanced Alfvénic turbulence at ion-kinetic scales in the solar wind
Voitenko, Y. M.; Gogoberidze, G.
Using a semi-phenomenological model of the imbalanced Alfvénic turbulence, we study the turbulence transition from magnetohydrodynamic to sub-ion kinetic scales in the conditions typical for the fast solar wind. We show that the transition takes place in a wide wave number interval where the energy spectrum does not follow any power law. For large…
The Improved Orbit Solution and Component Masses of bet LMi
Wang, Xiaoli; Fu, Yanning; Xia, Fang
bet LMi is a double-lined visual binary with an orbital period of ∼39 yr. Via a simultaneous fitting to both astrometric and radial velocity measurements, we give a complete and improved orbit solution with high precision. Then, the component masses are precisely determined as 2.98 ± 0.10 M⊙ and 1.92 ± 0.04 M⊙ with a relative…
Variations in the Plasma Parameters of the Earth's Magnetotail during Substorm Initiation
Grigorenko, E. E.; Kronberg, E. A.; Kozak, L. V. +3 more
A chain of events accompanying the occurrence of a substorm in the Earth's ionosphere and magnetosphere is considered. Features of geomagnetic pulsations and mechanisms of their generation are indicated. Measurements of magnetic field fluctuations from fluxgate magnetometers, as well as the data on temperature, velocity, and concentration of elect…
Discovery of Five New Variables
Liakos, A.
Concerning the Li-rich status of KIC 9821622: a Kepler field RGB star reported as a Li-rich giant
Aoki, Wako; Reddy, Bacham E.; Singh, Raghubar +1 more
Given the implications for the origin of Li enhancement in red giants, we have reviewed the Li-rich classification of KIC 9821622, the only bonafide red giant branch (RGB) giant with a He inert core to date, reported as a Li-rich giant by reanalysing the high-resolution spectra. We have obtained A(Li)LTE = 1.42 ± 0.05 dex. After correct…
Diagnostics of plasma ionisation using torsional Alfvén waves
Ballai, I.
Aims: Using the recently observed torsional Alfvén waves in solar prominences, we determine the ionisation state of the plasma by taking into account that Alfvén waves propagate in a partially ionised prominence plasma. We derive the evolutionary equation of waves and compare the analytical solutions to observations to determine the number de…
Science merit function for the Kepler mission
Jenkins, Jon M.; Borucki, William J.; Duren, Riley M.
The Kepler mission was a National Aeronautics and Space Agency (NASA) Discovery-class mission designed to continuously monitor the brightness of at least 100,000 stars to determine the frequency of Earth-size and larger planets orbiting other stars. Once the Kepler proposal was chosen for a flight opportunity, it was necessary to optimize the desi…