Search Publications
A Comparison of Sparse and Non-sparse Techniques for Electric-Field Inversion from Normal-Component Magnetograms
Yeates, Anthony R.; Mackay, Duncan H.
An important element of 3D data-driven simulations of solar magnetic fields is the determination of the horizontal electric field at the solar photosphere. This electric field is used to drive the 3D simulations and inject energy and helicity into the solar corona. One outstanding problem is the localisation of the horizontal electric field such t…
Orbital evolution of the BepiColombo Mercury Planetary Orbiter (MPO) in the gravity field of Mercury
Oberst, Jürgen; Hussmann, Hauke; Stark, Alexander +2 more
We assessed the impact of the uncertainties in the gravity field harmonic coefficients of Mercury on the orbital evolution of the Mercury Planetary Orbiter (MPO), part of the European-Japanese BepiColombo mission. We used in our simulations the most recent estimation of the gravity field model of Mercury determined from radio tracking data of the …
Radio Proper Motions of the Energetic Pulsar PSR J1813-1749
Rodríguez, Luis F.; Dzib, Sergio A.
PSR J1813-1749 has peculiarities that make it a very interesting object of study. It is one of the most energetic and the most scattered pulsars known. It is associated with HESS J1813-178, one of the brightest and most compact TeV sources in the sky. Recently, Ho et al. used archival X-ray Chandra observations separated by more than 10 yr and det…
New insights into the WR nebula M1-67 with SITELLE
Drissen, Laurent; St-Louis, Nicole; Sévigny, Marcel +1 more
We present a detailed study of M1-67, a well-known nebula around the population I Wolf-Rayet star WR 124 (WNh 8), based on datacubes obtained with the imaging Fourier transform spectrometer SITELLE at the Canada-France-Hawaii Telescope. This allowed us to reconstruct detailed emission-line ratio maps that highlight clear orthogonal features from a…
The Robustness of Synthetic Observations in Producing Observed Core Properties: Predictions for the TolTEC Clouds to Cores Legacy Survey
Wilson, G.; Gutermuth, R.; Pokhrel, R. +3 more
We use hydrodynamical simulations of star-forming gas with stellar feedback and sink particles-proxies for young stellar objects (YSOs)-to produce and analyze synthetic 1.1 mm continuum observations at different distances (150-1000 pc) and ages (0.49-1.27 Myr). We characterize how the inferred core properties, including mass, size, and clustering …
Solar Wind—Magnetosphere Coupling During Radial Interplanetary Magnetic Field Conditions: Simultaneous Multi-Point Observations
Escoubet, C. P.; Lavraud, B.; Fear, R. C. +12 more
In-situ spacecraft missions are powerful assets to study processes that occur in space plasmas. One of their main limitations, however, is extrapolating such local measurements to the global scales of the system. To overcome this problem at least partially, multi-point measurements can be used. There are several multi-spacecraft missions currently…
The assembly, calibration, and predicted performance of the SISTINE-2 sounding rocket payload
Kruczek, Nicholas; France, Kevin; Fleming, Brian +4 more
The Suborbital Imaging Spectrograph for Transition-region Irradiance from Nearby Exoplanet host stars (SIS- TINE) sounding rocket payload is an f /30 imaging spectrograph designed to measure the far ultraviolet (1000 - 1275 and 1300 - 1565 Å) output of exoplanet host stars. The instrument is composed of an f /14 Cassegrain telescope with a 500 mm …
Comprehensive in-orbit performance evaluation of the BepiColombo Laser Altimeter (BELA)
Thomas, Nicolas; Hussmann, Hauke; Pommerol, Antoine +7 more
The BepiColombo Laser Altimeter (BELA) is on its way to Mercury on board the Mercury Planetary Orbiter (MPO), one of the two spacecraft of the BepiColombo mission. It will arrive at Mercury in December 2025 and start measurements of Mercury's surface and environment. The goal of this study is to analyze the performance of BELA by using a comprehen…
Comet 21P/Giacobini-Zinner: Water production activity over 20 years with SOHO/SWAN
Bertaux, J. -L.; Combi, M. R.; Quémerais, E. +3 more
In 1985 Comet 21P/Giacobini-Zinner was the first comet visited by a spacecraft, the International Cometary Explorer (ICE) satellite, several months before the armada of Halley spacecraft had their encounters in 1986. ICE was originally the ISEE-3 satellite, designed for magnetospheric measurements near the Earth, and was diverted via a lunar gravi…
Flare stars in nearby Galactic open clusters based on TESS data
Baratella, M.; Vida, K.; Maryeva, O. +3 more
The study is devoted to search for flare stars among confirmed members of Galactic open clusters using high-cadence photometry from TESS mission. We analyzed 957 high-cadence light curves of members from 136 open clusters. As a result, 56 flare stars were found, among them 8 hot B-A type objects. Of all flares, 63 % were detected in sample of cool…