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403 papers · 1 filter
Multiplicity of Cool Stars and their Evolution
Matthew I. Swayne, Leen Decin, Theo Khouri +12
Making up a sizeable portion of the galactic census, stellar multiples are experiencing a renaissance. Enabling the study of multiple strands of the study of cool stars, stellar mu…
Calculation of Field Line Slippage Rates in Coronal Simulations
Valentin Aslanyan, David MacTaggart, Roger B. Scott +6
We present the Universal Slippage calculator (\texttt{USlip}), an extension of the Universal Fieldline Tracer (\texttt{UFiT}), that computes magnetic field line slippage rates from…
Frequency-time-resolved Imaging Spectroscopy of Fine Structures in a Solar Radio Noise Storm
Daniel L. Clarkson, Eduard P. Kontar
Solar radio noise storms are common phenomena, composed of broadband continuum emission embedded with diverse fine structures, yet their unusually compact apparent sizes remain une…
A Statistical Survey of Faint Solar X-ray Transients Observed by NuSTAR
Reed B. Masek, Lindsay Glesener, Jessie Duncan +14
In this paper, we use a highly sensitive telescope to characterize solar X-ray transients ranging from microflares in active regions down to weakly energetic brightenings in the qu…
Non-LTE Analysis of Pre-eruptive Prominence Plasma Parameters Effects on the Lyman-beta and Lyman-gamma Lines with Solar Orbiter SPICE Observations
Yong Zhang, Nicolas Labrosse, Susanna Parenti +1
The first dedicated observation of an off-limb prominence by Solar Orbiter took place on April 15, 2023. Our aim is to determine the range of different physical parameters of this…
Analysis of Lyman-beta and Lyman-gamma Lines in a Pre-Eruptive and Eruptive Prominence with Solar Orbiter SPICE Observations
Yong Zhang, Nicolas Labrosse, Susanna Parenti +1
The first dedicated observation of an off-limb prominence by the Spectral Imaging of the Coronal Environment (SPICE) instrument on board Solar Orbiter took place on April 15, 2023.…
Stellar engines and Dyson bubbles can be stable
Colin R McInnes
A range of speculative space ventures envisage the use of ultra-large structures for the collection and reflection of light. Given the length-scale of such structures they cannot b…
Signatures of Large-Scale Magnetic Field Disturbances and Switchbacks in Interplanetary Type III Radio Bursts
Daniel L. Clarkson, Eduard P. Kontar
Type III solar radio bursts are driven by non-thermal electron beams travelling along heliospheric magnetic fields, with the radio emission frequency drift-rate determined by the b…
Quiet Sun impulsive events observed with NuSTAR during solar minimum
Sarah Paterson, Iain G. Hannah, Brian W. Grefenstette +6
The investigation of small-scale energy release in the Sun's atmosphere is important in understanding how the corona is heated. Previous work has been able to study small EUV and S…
Superhot (> 30 MK) flare observations with STIX: Joint spectral fitting
Muriel Zoë Stiefel, Natália Bajnoková, Säm Krucker
Spectroscopic analysis of large flares (>X1) in the hard X-ray (HXR) range offers unique insights into the hottest (> 30 MK) flare plasma, the so-called superhot thermal component.…
Microwave Imaging Spectroscopy Diagnosis of the Slow-rise Precursor of a Major Solar Eruption
Yuankun Kou, Xin Cheng, Sijie Yu +3
In this Letter, taking advantage of microwave data from the Expanded Owens Valley Solar Array and extreme-ultraviolet (EUV) data from the Atmospheric Imaging Assembly, we present t…
Total Power and Low-energy Cut-off Time Evolution of Solar Flare Accelerated Electrons Using X-Ray Observations and Warm-Target Model
Debesh Bhattacharjee, Eduard P. Kontar, Yingjie Luo
A primary characteristic of solar flares is the efficient acceleration of electrons to nonthermal deka-keV energies. While hard X-Ray (HXR) observation of bremsstrahlung emission s…
Chromospheric velocities in an M3.2 flare using He I 1083.0 nm and Ca II 854.2 nm
C. Kuckein, M. Collados, A. Asensio Ramos +6
We study the chromospheric LOS velocities during the GOES M3.2 flare (SOL2013-05-17T08:43) using simultaneous spectroscopic data of the He I 1083.0 nm triplet and Ca II 854.2 nm li…
Spectroscopic investigations of a filament reconnecting with coronal loops during a two-ribbon solar flare
Reetika Joshi, Jaroslav Dudík, Brigitte Schmieder +2
In the standard 2D model of eruption, the eruption of a magnetic flux rope is associated with magnetic reconnection occurring beneath it. However, in 3D, additional reconnection ge…
Time-evolving coronal modelling of the solar maximum around the solar storms in May 2024 by COCONUT
Haopeng Wang, Stefaan Poedts, Andrea Lani +8
Time-evolving MHD coronal models deliver more realistic results than traditional quasi-steady-state models. The fully implicit time-evolving coronal model COCONUT performs efficien…
Tracing the Heliospheric Magnetic Field via Anisotropic Radio-Wave Scattering
Daniel L. Clarkson, Eduard P. Kontar, Nicolina Chrysaphi +4
Astrophysical radio sources are embedded in turbulent magnetised environments. In the 1 MHz sky, solar radio bursts are the brightest sources, produced by electrons travelling alon…
Electron Beam Propagation and Radio-Wave Scattering in the Inner Heliosphere using Five Spacecraft
Luis Alberto Cañizares, Sam T. Badman, Nicolina Chrysaphi +4
Solar energetic particles such as electrons can be accelerated to mildly-relativistic velocities in the solar corona. These electrons travel through the turbulent corona generating…
Ringworlds and Dyson spheres can be stable
Colin R McInnes
In his 1856 Adams Prize essay, James Clark Maxwell demonstrated that Saturn's rings cannot be comprised of a uniform rigid body. This is a consequence of the two-body gravitational…
Temporally resolved Type III solar radio bursts in the frequency range 3-13 MHz
Antonio Vecchio, Milan Maksimovic, Nicolina Chrysaphi +2
Radio observations from space allow to characterize solar radio bursts below the ionospheric cutoff, which are otherwise inaccessible, but suffer from low, insufficient temporal re…
Spectral Characteristics of a Rotating Solar Prominence in Multiple Wavelengths
A. G. M. Pietrow, V. Liakh, C. M. J. Osborne +2
We present synthetic spectra corresponding to a 2.5D magnetohydrodynamical simulation of a rotating prominence in the Ca II 8542 Å, H, Ca II K, Mg II k, Ly , and Ly lines…
First joint X-ray solar microflare observations with NuSTAR and Solar Orbiter/STIX
Natália Bajnoková, Iain G. Hannah, Kristopher Cooper +5
We present the first joint spectral and imaging analysis of hard X-ray (HXR) emission from 3 microflares observed by the Nuclear Spectroscopic Telescope ARray (NuSTAR) and Solar Or…
High-resolution observations of recurrent jets from an arch filament system
Reetika Joshi, Luc Rouppe van der Voort, Brigitte Schmieder +4
Solar jets are collimated plasma ejections along magnetic field lines observed in hot (EUV jets) and cool (chromospheric surges) temperature diagnostics. Their trigger mechanisms a…
Radiance Cascades: A Novel High-Resolution Formal Solution for Multidimensional Non-LTE Radiative Transfer
Christopher M. J. Osborne, Alexander Sannikov
Non-LTE radiative transfer is a key tool for modern astrophysics: it is the means by which many key synthetic observables are produced, thus connecting simulations and observations…
Hard X-rays from the deep solar atmosphere. An unusual UV burst with flare properties
L. P. Chitta, I. G. Hannah, L. Fletcher +4
Explosive transient events occur throughout the solar atmosphere. The differing manifestations range from coronal mass ejections to Ellerman bombs. The former may have negligible s…