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Implications of High-density, High-temperature Ridges Observed in Some Two-ribbon Flares
Qiu, Jiong; Longcope, Dana
Several two-ribbon solar flares observed on the disk, notably including the Bastille flare of 2000 July 14, show an extended ridge of plasma running along the loop tops of the post-reconnection arcade. In that and two more recent examples, the ridge is visible in emission by Fe XXIV at roughly 17 MK, with a high, steadily increasing emission measu…
Mars and the ESA Science Programme - the case for Mars polar science
Becerra, P.; Thomas, Nicolas; Smith, I. B.
Current plans within the European Space Agency (ESA) for the future investigation of Mars (after the ExoMars programme) are centred around participation in the Mars Sample Return (MSR) programme led by NASA. This programme is housed within the Human and Robotic Exploration (HRE) Directorate of ESA. This White Paper, in response to the Voyage 2050 …
The first X-ray spectrum of the high-mass X-ray binary XTE J1855-026 during the compact object eclipse
Torrejón, J. M.; Sanjurjo-Ferrín, G.; Rodes-Roca, J. J.
We present the first XMM-Newton observation of the classical supergiant high-mass X-ray binary XTE J1855-026 taken entirely during the eclipse of the neutron star (NS), covering the orbital phases ϕ = 0.00-0.11. The analysis of the data allows us to (a) compare with the parameters obtained during the existing pre-eclipse observation and (b) explor…
Antarctic Survey Telescope 3-3: Overview, System Performance and Preliminary Observations at Yaoan, Yunnan
Wang, Lifan; Hu, Lei; Hu, Maokai +17 more
The third Antarctic Survey Telescope array instrument at Dome A in Antarctica, the AST3-3 telescope, has been in commissioning from March 2021. We deployed AST3-3 at the Yaoan astronomical station in Yunnan Province for an automatic time-domain survey and follow-up observations with an optimised observation and protection system. The telescope sys…
Deep-learning Reconstruction of Sunspot Vector Magnetic Fields for Forecasting Solar Storms
Dhuri, Dattaraj B.; Bhattacharjee, Shamik; Hanasoge, Shravan M. +1 more
Solar magnetic activity produces extreme solar flares and coronal mass ejections, which pose grave threats to electronic infrastructure and can significantly disrupt economic activity. It is therefore important to appreciate the triggers of explosive solar activity and develop reliable space weather forecasting. Photospheric vector magnetic field …
The Discovery of New Binary Systems Using Value-added Catalogs and TESS Data
Carrell, Kenneth; Gray Cherry, Jackie; Gillespie, Charles
Using potentially variable sources flagged in value-added catalogs created by combining data from the Gaia, IPHAS, and KIS surveys, we utilized data from TESS, McDonald Observatory, and the Southern Plains Private Observatory to confirm and identify four of these potentially variable sources as eclipsing binaries. Combining large data sets and obt…
Investigating datasets with high IRIS burst prevalence
Kleint, L.; Nelson, C. J.
Context. Approximately 0.01% of all Si IV 1394 Å spectra sampled in 2013 and 2014 by the Interface Region Imaging Spectrograph (IRIS) have IRIS burst profiles. However, these events are not evenly distributed across datasets with 19.31% of these spectra being identified in only six (of more than 3500) rasters.
Aims: Here, we investigate five …
X-ray views of our solar system
Branduardi-Raymont, Graziella
Relation between Magnetosonic Waves and Pitch Angle Anisotropy of Warm Protons
Li, W.; Jaynes, A. N.; Ma, Q. +3 more
In the past decade, many observations of transversely heated low energy protons were reported in the inner magnetosphere. Interestingly, most of the time heated protons were observed along with magnetosonic waves. Due to the strong correlation, it was often assumed that magnetosonic waves were responsible for the heating of low energy protons. By …
OGLE-2017-BLG-1038: A Possible Brown-dwarf Binary Revealed by Spitzer Microlensing Parallax
Han, Cheongho; Udalski, Andrzej; Lee, Chung-Uk +38 more
We report the analysis of microlensing event OGLE-2017-BLG-1038, observed by the Optical Gravitational Lensing Experiment, Korean Microlensing Telescope Network, and Spitzer telescopes. The event is caused by a giant source star in the Galactic Bulge passing over a large resonant binary-lens caustic. The availability of space-based data allows the…