Search Publications
The LASCO Coronal Brightness Index
Howard, Russell A.; Battams, Karl; Lean, Judith L. +2 more
We present the construction of a new white-light coronal brightness index (CBI) from the entire archive of observations recorded by the Large Angle Spectrometric Coronagraph (LASCO) C2 camera between 1996 and 2017, comprising two full solar cycles. We reduce all fully calibrated daily C2 observations of the white-light corona into a single daily c…
Open-Source Software Analysis Tool to Investigate Space Plasma Turbulence and Nonlinear DYNamics (ODYN)
Echim, M. M.; Teodorescu, E.
We have designed and built a versatile modularized software library—ODYN—that wraps a comprehensive set of advanced data analysis methods meant to facilitate the study of turbulence, nonlinear dynamics, and complexity in space plasmas. The Python programming language is used for the algorithmic implementation of models and methods devised to under…
Wind retrieval from temperature measurements from the Rover Environmental Monitoring Station/Mars Science Laboratory
Zorzano, María-Paz; Martín-Torres, Javier; Soria-Salinas, Álvaro +1 more
This work presents a novel method for the real-time retrieval of wind speed on the surface of Mars that uses temperature measurements from the Rover Environmental Monitoring Station (REMS) instrument onboard the Curiosity rover of the Mars Science Laboratory (MSL) mission. After final failure of the Wind Sensor (WS) in sol 1491, REMS has not been …
A Framework for Relative Biosignature Yields from Future Direct Imaging Missions
Tuchow, Noah W.; Wright, Jason T.
Future exoplanet direct imaging missions, such as HabEx and LUVOIR, will select target stars to maximize the number of Earth-like exoplanets that can have their atmospheric compositions characterized. Because one of these missions' aims is to detect biosignatures, they should also consider the expected biosignature yield of planets around these st…
Predicted Masses of Galactic Cepheids in the Gaia Data Release 2
Marconi, Marcella; Molinaro, Roberto; Ripepi, Vincenzo +4 more
On the basis of recently computed nonlinear convective pulsation models of Galactic Cepheids, spanning wide ranges of input stellar parameters, we derive theoretical mass-dependent Period-Wesenheit relations in the Gaia bands, namely, G, GBP, and GBR, that are found to be almost independent of the assumed efficiency of supera…
Structural parameters for the globular-cluster-like objects in NGC 1052-DF2
Zou, Hu; Nie, Jundan; Zhang, Tianmeng +8 more
Recently, van Dokkum et al. have found an ultra-diffuse galaxy NGC 1052-DF2 with little or no dark matter, based on a spectroscopic study of its 11 constituent globular-cluster-like objects. In this paper, we analyse these 11 objects using Hubble Space Telescope imaging. We derive the structural parameters for each object by fitting the surface br…
Magnetic Energy Balance in the Quiet Sun on Supergranular Spatial and Temporal Scales
Consolini, Giuseppe; Berrilli, Francesco; Del Moro, Dario +1 more
Small-scale magnetic fields are ubiquitous in the quiet solar photosphere and may store and transfer huge amounts of energy to the upper atmospheric layers. For this reason, it is fundamental to constrain the energetics of the quiet Sun. By taking advantage of a 24 hr long magnetogram time series acquired by the Hinode mission without interruption…
Hot Atmospheres of Galaxies, Groups, and Clusters of Galaxies
Werner, Norbert; Mernier, François
Most of the ordinary matter in the local Universe has not been converted into stars but resides in a largely unexplored diffuse, hot, X-ray emitting plasma. It pervades the gravitational potentials of massive galaxies, groups and clusters of galaxies, as well as the filaments of the cosmic web. The physics of this hot medium, such as its dynamics,…
Porosity gradients as a means of driving lateral flows at cometary surfaces
Thomas, Nicolas; Christou, Chariton; Dadzie, S. Kokou +1 more
The Rosetta spacecraft has provided invaluable and unexpected information about cometary outgassing. The on-board instruments ROSINA, MIRO, and VIRTIS showed non-uniform outgassing of H2O over the surface of the nucleus. Rarefied gas flows display remarkable flow phenomena that may help explain diverse physical observations and models h…
Secondary-electron radiation accompanying hadronic GeV-TeV gamma-rays from supernova remnants
Wang, Wei; Li, Zhuo; Huang, Yan +1 more
The synchrotron radiation from secondary electrons and positrons (SEPs) generated by hadronic interactions in the shock of supernova remnant (SNR) could be a distinct evidence of cosmic ray (CR) production in SNR shocks. Here, we provide a method where the observed gamma-ray flux from SNRs, created by pion decays, is directly used to derive the SE…