Search Publications
Constraining the surface properties of Helene
Royer, E.; Howett, C. J. A.
We analyze two sets of observations of Dione's co-orbital satellite Helene taken by Cassini's Composite Infrared Spectrometer (CIRS). The first observation was a CIRS FP3 (600 to 1100 cm-1, 9.1 to 16.7 µm) stare of Helene's trailing hemisphere, where two of the ten FP3 pixels were filled. The daytime surface temperatures derived f…
Multispacecraft Measurements In The Magnetosphere
De Keyser, Johan; Shen, Chao; Pu, ZuYin +9 more
Kinematic Properties of the GAIA EDR3 Catalogue
Tsvetkov, A. S.
We have obtained a solution of the Ogorodnikov-Milne stellar-kinematics equations based on the material of the entire Gaia EDR3 star catalogue containing 1.8 billion objects. In view of the insufficient accuracy of individual trigonometric parallaxes, we have also obtained an analogous solution based on a sub-catalogue of selected 98 million stars…
Numerical Study of Two Injection Methods for the 2007 November 15 Coronal Mass Ejection in the Inner Heliosphere
Shen, Fang; Feng, Xueshang; Zhang, Man +1 more
In this paper, we use two injection methods, i.e., coronal mass ejection (CME) with and without radial compression, to investigate the propagation of the 2007 November 15 CME in the inner heliosphere with a three-dimensional, time-dependent, numerical magnetohydrodynamic model. In order to reproduce the large-scale interplanetary magnetic field as…
Measurement of Hubble constant: were differences in secondary distance indicators apparent as early as the HST Key Project?
Gupta, Shashikant; Thakur, Rahul Kumar; Nigam, Rahul +1 more
Different measurements of the Hubble constant (H0) are not consistent, and a tension between the CMB based methods and cosmic distance ladder based methods has been observed. Measurements from various distance based methods are also inconsistent. To aggravate the problem, the same cosmological probe (Type Ia SNe for instance) calibrated…
Controls on the Global Distribution of Martian Landslides
Ehlmann, Bethany L.; Roback, Kevin P.
Recent acquisition of high resolution satellite imagery of the Martian surface has permitted landslides to be studied on a global scale on Mars for the first time. We apply the Scoops3D software package to compute slope stability for select regions of the Martian surface, combining calculations of slope stability with number of observed landslides…
Spatially Highly Resolved Solar-wind-induced Magnetic Field on Venus
He, Maosheng; Vogt, Joachim; Zhang, Tielong +2 more
The current work investigates the Venusian solar-wind-induced magnetosphere at a high spatial resolution using all Venus Express (VEX) magnetic observations through an unbiased statistical method. We first evaluate the predictability of the interplanetary magnetic field (IMF) during VEX's Venusian magnetospheric transits and then map the induced f…
Albert Galeev: The Problem of Metastability and Explosive Reconnection
Popov, V. Yu.; Zelenyi, L. M.; Grigorenko, E. E. +2 more
−Albert Abubakirovich Galeev is a Soviet and Russian expert in plasma physics who actively contributed to fusion research. In the early 1970s, he became a head of department at the Space Research Institute of the Academy of Sciences of USSR and began devoting most of his time to the problems of the physics of space plasma and made a very important…
Exploring the robustness of Keplerian signals to the removal of active and telluric features
Butler, R. P.; Jones, H. R. A.; Vogt, S. +2 more
We examine the influence of activity- and telluric-induced radial velocity (RV) signals on high-resolution spectra taken with an iodine absorption cell. We exclude 2- $\mathring{\rm A}$ spectral chunks containing active and telluric lines based on the well-characterized K1V star α Centauri B and illustrate the method on Epsilon Eridani - an active…
Light Element Abundances and Multiple Populations in M53
Vesperini, Enrico; Gerber, Jeffrey M.; Friel, Eileen D.
We present results from a study of 94 red giant stars in the globular cluster M53. We use low-resolution spectra to measure the strength of CN and CH features at ∼3800 and 4300 Å, respectively. The strengths of these features are used to classify stars into a CN-enhanced and CN-normal population and to measure C and N abundances in all 94 stars. W…