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An introduction to the data and tools of planetary geomorphology
Beyer, Ross A.
This manuscript presents a review of data used by planetary geomorphologists and the software tools needed to prepare, process, and analyze those data, along with an example of doing so. Visible image capture and the photometric and geometric processing of those images are reviewed, as are laser altimetry data, and terrain data derived from images…
The double-gradient magnetic instability: Stabilizing effect of the guide field
Korovinskiy, D. B.; Semenov, V. S.; Erkaev, N. V. +7 more
The role of the dawn-dusk magnetic field component in stabilizing of the magnetotail flapping oscillations is investigated in the double-gradient model framework (Erkaev et al., Phys. Rev. Lett. 99, 235003 (2007)), extended for the magnetotail-like configurations with non-zero guide field By. Contribution of the guide field is examined …
Disentangling Overlapping Astronomical Sources Using Spatial and Spectral Information
van Dyk, David A.; Kashyap, Vinay L.; Jones, David E.
We present a powerful new algorithm that combines both spatial information (event locations and the point-spread function) and spectral information (photon energies) to separate photons from overlapping sources. We use Bayesian statistical methods to simultaneously infer the number of overlapping sources, to probabilistically separate the photons …
Bandwidths and amplitudes of chorus-like banded emissions measured by the TC-1 Double Star spacecraft
Santolík, O.; Yearby, K. H.; Cornilleau-Wehrlin, N. +1 more
Characteristics of banded whistler-mode emissions are derived from a database of chorus-like events obtained from the complete data set of the wave measurements provided by the Spatio-Temporal Analysis of Field Fluctuation-Digital Wave Processing (STAFF-DWP) wave instrument on board the TC-1 Double Star spacecraft. Our study covers the full operat…
The Role of Bulge Formation in the Homogenization of Stellar Populations at z~2 as revealed by Internal Color Dispersion in CANDELS
Giavalisco, M.; Papovich, C.; Koekemoer, A. M. +13 more
We use data from the Cosmic Assembly Near-infrared Deep Extragalactic Legacy Survey to study how the spatial variation in the stellar populations of galaxies relates to the formation of galaxies at 1.5\lt z\lt 3.5. We use the internal color dispersion (ICD), measured between the rest-frame UV and optical bands, which is sensitive to age (and dust …
X-ray galaxy clusters abundance and mass temperature scaling
Blanchard, Alain; Douspis, Marian; Ilić, Stéphane
The abundance of clusters of galaxies is known to be a potential source of cosmological constraints through their mass function. In the present work, we examine the information that can be obtained from the temperature distribution function of X-ray clusters. For this purpose, the mass-temperature (M - T) relation and its statistical properties ar…
Outflow of low-energy O+ ion beams observed during periods without substorms
Dandouras, I.; Rème, H.; Parks, G. K. +5 more
Numerous observations have shown that ions flow out of the ionosphere during substorms with more fluxes leaving as the substorm intensity increases (Wilson et al., 2004). In this article we show observations of low-energy (few tens of electron volts) ionospheric ions flowing out periods without substorms, determined using the Wideband Imaging Came…
Exploring the Possibility of O and Ne Contamination in Ulysses Observations of Interstellar Helium
Wood, Brian E.; Müller, Hans-Reinhard; Möbius, Eberhard +4 more
We explore the possibility that interstellar O and Ne may be contributing to the particle signal from the GAS instrument on Ulysses, which is generally assumed to be entirely He. Motivating this study is the recognition that an interstellar temperature higher than any previously estimated from Ulysses data could potentially resolve a discrepancy b…
The Stellar Mass-Halo Mass Relation for Low-mass X-Ray Groups At 0.5< z< 1 in the CDFS With CSI
Kelson, Daniel D.; McCarthy, Patrick J.; Dressler, Alan +4 more
Since z∼ 1, the stellar mass density locked in low-mass groups and clusters has grown by a factor of ∼8. Here, we make the first statistical measurements of the stellar mass content of low-mass X-ray groups at 0.5\lt z\lt 1, enabling the calibration of stellar-to-halo mass scales for wide-field optical and infrared surveys. Groups are selected fro…
Modeling of Hot Plasma in the Solar Active Region Core
Schmelz, J. T.; Pathak, S.; Imada, S. +2 more
Magnetically confined plasma with temperatures ≥slant 5 {MK} are a feature of hot coronal loops observed in the core of active regions. In this paper, using observations and MHD modeling of coronal loops, we investigate whether wave heating (Alternating Current) models can describe the high temperature loops observed in the active region of 2012 S…