Search Publications
Mapping lunar mare basalt units in mare Imbrium as observed with the Moon Mineralogy Mapper (M³)
Hiesinger, H.; Besse, S.; Thiessen, F. +1 more
We examine compositional variations of volcanic units in the Imbrium basin using spectral observations from the Moon Mineralogy Mapper (M³) instrument on board the Chandrayaan-1 spacecraft. The spectral range of M³ reflectance measurements from 400 to 3000 nm is well-suited to study distinctive absorption bands near 1000 and 2000 nm resulting from…
Dependence of IMF By penetration into the neutral sheet on IMF Bz and geomagnetic activity
Dunlop, M.; Cao, JinBin; Duan, Aiying +2 more
The penetration of interplanetary magnetic field (IMF) By into the magnetosphere plays an important role in determining magnetospheric configuration and its dynamics. In this paper, using 9 years of Cluster data at the center of neutral sheet, we statistically study the relations of the penetration of IMF By in the neutral sh…
Saturn's dayside ultraviolet auroras: Evidence for morphological dependence on the direction of the upstream interplanetary magnetic field
Lewis, G. R.; Dougherty, M. K.; Alexeev, I. I. +6 more
We examine a unique data set from seven Hubble Space Telescope (HST) "visits" that imaged Saturn's northern dayside ultraviolet emissions exhibiting usual circumpolar "auroral oval" morphologies, during which Cassini measured the interplanetary magnetic field (IMF) upstream of Saturn's bow shock over intervals of several hours. The auroras general…
High-energy X-Ray Detection of G359.89-0.08 (Sgr A-E): Magnetic Flux Tube Emission Powered by Cosmic Rays?
Hailey, Charles J.; Mori, Kaya; Bauer, Franz E. +11 more
We report the first detection of high-energy X-ray (E > 10 keV) emission from the Galactic center non-thermal filament G359.89-0.08 (Sgr A-E) using data acquired with the Nuclear Spectroscopic Telescope Array (NuSTAR). The bright filament was detected up to ~50 keV during a NuSTAR Galactic center monitoring campaign. The featureless power-law s…
Broad absorption line variability in radio-loud quasars
Brandt, W. N.; Welling, C. A.; Miller, B. P. +2 more
We investigate C IV broad absorption line (BAL) variability within a sample of 46 radio-loud quasars (RLQs), selected from Sloan Digital Sky Survey (SDSS)/Faint Images of the Radio Sky at Twenty-Centimeters (FIRST) data to include both core-dominated (39) and lobe-dominated (7) objects. The sample consists primarily of high-ionization BAL quasars,…
Konus- Wind and Helicon- Coronas-F observations of solar flares
Frederiks, D. D.; Svinkin, D. S.; Aptekar, R. L. +7 more
Results of solar flare observations obtained in the Konus-Wind experiment from November, 1994 to December, 2013 and in the Helicon Coronas-F experiment during its operation from 2001 to 2005, are presented. For the periods indicated Konus-Wind detected in the trigger mode 834 solar flares, and Helicon-Coronas-F detected more than 300 solar flares.…
The Centaur 10199 Chariklo: investigation into rotational period, absolute magnitude, and cometary activity
Fornasier, S.; Snodgrass, C.; Alvarez-Candal, A. +6 more
Context. Rings have recently been discovered around the Centaur 10199 Chariklo.
Aims: In this paper we present new photometric data, obtained at the 4.2 m SOAR Telescope, aiming to investigate Chariklo's absolute magnitude and rotational period, which is still unknown, and to look for potential cometary activity.
Methods: The field backg…
Eyes in the sky. Interactions between asymptotic giant branch star winds and the interstellar magnetic field
Decin, L.; Cox, N. L. J.; van Marle, A. J.
Context. The extended circumstellar envelopes (CSEs) of evolved low-mass stars display a large variety of morphologies. Understanding the various mechanisms that give rise to these extended structures is important to trace their mass-loss history.
Aims: Here, we aim to examine the role of the interstellar magnetic field in shaping the extende…
Topological inflation from the Starobinsky model in supergravity
Yokoyama, Jun'ichi; Kamada, Kohei
We consider the ghost-free higher-order corrections to the Starobinsky model in the old-minimal supergravity, focusing on a sector among several scalar fields in the model that reproduces the scalaron potential in the original Starobinsky model. In general, higher-order corrections cannot be forbidden by symmetries, which likely violate the flatne…
Spacecraft exploration of Phobos and Deimos
Hoffmann, Harald; Duxbury, Thomas C.; Zakharov, Alexander V. +1 more
We review the previous exploration of Phobos and Deimos by spacecraft. The first close-up images of Phobos and Deimos were obtained by the Mariner 9 spacecraft in 1971, followed by much image data from the two Viking orbiters at the end of the 70s, which formed the basis for early Phobos and Deimos shape and dynamic models. The Soviet Phobos 2 spa…