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NEOExchange - an online portal for NEO and Solar System science
Lister, T. A.; Gomez, E.; Chatelain, J. +4 more
Las Cumbres Observatory (LCO) has deployed a homogeneous telescope network of ten 1-m telescopes to four locations in the northern and southern hemispheres, with a planned network size of twelve 1-m telescopes at 6 locations. This network is very versatile and is designed to respond rapidly to target of opportunity events and also to perform long …
Determining the source and eruption dynamics of a stealth CME using NLFFF modelling and MHD simulations
Yardley, S. L.; Pagano, P.; Mackay, D. H. +1 more
Context. Coronal mass ejections (CMEs) that exhibit weak or no eruption signatures in the low corona, known as stealth CMEs, are problematic as upon arrival at Earth they can lead to geomagnetic disturbances that were not predicted by space weather forecasters.
Aims: We investigate the origin and eruption of a stealth event that occurred on 2…
A parsec-scale faint jet in the nearby changing-look Seyfert galaxy Mrk 590
Komossa, S.; Paragi, Zsolt; Yuan, Feng +9 more
Broad Balmer emission lines in active galactic nuclei (AGN) may display dramatic changes in amplitude, even disappearance and re-appearance in some sources. As a nearby galaxy at a redshift of z = 0.0264, Mrk 590 suffered such a cycle of Seyfert type changes between 2006 and 2017. Over the last 50 yr, Mrk 590 also underwent a powerful continuum ou…
The Impact of Turbulence on Physics of the Geomagnetic Tail
Antonova, Elizaveta E.; Stepanova, Marina V.
There is a vast amount of evidence that suggests that the geomagnetic tail is like a turbulent wake behind an obstacle. Large-scale vortices in the wake are able to generate turbulent transport that takes place both along the plasma sheet, in the X and Y directions, and across the plasma sheet, in the Z direction. Thus, turbulent fluctuations in a…
Superresolving Herschel imaging: a proof of concept using Deep Neural Networks
Serjeant, Stephen; Wang, Wei-Hao; Lim, Chen-Fatt +4 more
Wide-field submillimetre surveys have driven many major advances in galaxy evolution in the past decade, but without extensive follow-up observations the coarse angular resolution of these surveys limits the science exploitation. This has driven the development of various analytical deconvolution methods. In the last half a decade Generative Adver…
Magnetohydrodynamic Modeling of the Solar Corona with an Effective Implicit Strategy
Shen, Fang; Feng, Xueshang; Xiang, Changqing +4 more
In this paper, we design an effective and robust model to solve the 3D single-fluid solar wind plasma magnetohydrodynamics (MHD) problem of low plasma β. This MHD model is formulated on a six-component composite grid system free of polar singularities. The computational domain ranges from the solar surface to the super-Alfvénic region. As common t…
WawHelioGlow: A Model of the Heliospheric Backscatter Glow. I. Model Definition
Bzowski, M.; Kubiak, M. A.; Kowalska-Leszczynska, I. +1 more
The helioglow is the fluorescence of interstellar atoms inside the heliosphere, where they are excited by the solar EUV emission. So far, the helioglow of interstellar H and He has been detected. The helioglow features a characteristic distribution in the sky, which can be used to derive the properties of both interstellar neutral (ISN) gas and th…
Understanding the Effects of Systematics in Exoplanetary Atmospheric Retrievals
Kempton, Eliza M. -R.; Ih, Jegug
Retrieval of exoplanetary atmospheric properties from their transmission spectra commonly assumes that the errors in the data are Gaussian and independent. However, non-Gaussian noise can occur due to instrumental or stellar systematics and the merging of discrete data sets. We investigate the effect of correlated noise and constrain the potential…
Why are ELEvoHI CME Arrival Predictions Different if Based on STEREO A or STEREO B Heliospheric Imager Observations?
Temmer, Manuela; Möstl, Christian; Weiss, Andreas J. +9 more
Accurate forecasting of the arrival time and arrival speed of coronal mass ejections (CMEs) is an unsolved problem in space weather research. In this study, a comparison of the predicted arrival times and speeds for each CME based, independently, on the inputs from the two STEREO vantage points is carried out. We perform hindcasts using ELlipse Ev…
A LAMOST BHB Catalog and Kinematics Therein. I. Catalog and Halo Properties
Shen, Juntai; Smith, Martin C.; Li, Zhao-Yu +1 more
In this paper, we collect a sample of stars observed both in LAMOST and Gaia, which have colors implying a temperature hotter than 7000 K. We train a machine-learning algorithm on LAMOST spectroscopic data which has been tagged with stellar classifications and metallicities, and use this machine to construct a catalog of blue horizontal branch sta…