33 citations · 117 across the 16 of their papers we have counts for
17 papers
Sunrise III/SUSI reveals extended and spectrally structured Ca II K emission above the solar limb
Ivan Milić, Christopher M. J. Osborne, Francisco A. Iglesias +32
The Sunrise III/SUSI instrument performed a sit-and-stare observation of the off-limb emission in the Ca II K line core, with a combination of excellent temporal and spectral resol…
Signatures of photospheric convection throughout the solar atmosphere: the EVE Sun-as-a-star mHz continuum
Hugh Hudson, Anne-Marie Broomhall, Lyndsay Fletcher +5
Convectively driven motions in the solar photosphere can generate broadband Doppler variability across the chromosphere, transition region and corona. Here we investigate this vari…
Diagnostics for the solar chromosphere using neutral carbon Rydberg lines
R. P. Dufresne, C. M. O. Osborne, G. Del Zanna
Diagnostics for the solar chromosphere are relatively few compared to other parts of the atmosphere. Despite this, hundreds of Rydberg lines emitted by neutrals in this region have…
Understanding Solar Flares and Energetic Events: Open questions, observational requirements, and instrumental needs over the coming decade
Malcolm K. Druett, Graham S. Kerr, Joel C. Allred +15
Solar flares are the largest energy-release events in the Solar System, allowing us to study fundamental physical phenomena under extreme conditions. Those include magnetic reconne…
Improving the atomic modelling for solar UV radiative transfer calculations
R. P. Dufresne, G. Del Zanna, C. M. J. Osborne
Radiative transfer calculations have been produced over the years for many lines and continua in the UV wavelength range of solar and cool stellar atmospheres for a variety of cond…
Observational signatures of mixing-induced cooling in the Kelvin-Helmholtz instability
Ben Snow, Chris Osborne, Andrew Hillier
Cool (K), dense material permeates the hot (K), tenuous solar corona in form of coronal condensations, for example prominences and coronal rain. As the…
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…
An impulsive geomagnetic effect from an early-impulsive flare
Hugh S. Hudson, Edward. W. Cliver, Lyndsay Fletcher +6
The geomagnetic "solar flare effect" (SFE) results from excess ionization in the Earth's ionosphere, famously first detected at the time of the Carrington flare in 1859. This indir…
Doppler Dimming and Brightening Effects in Solar Prominences
Aaron W. Peat, Christopher M. J. Osborne, Petr Heinzel
We explored the impact that Doppler dimming and brightening effects from bulk motions of solar prominences have on the formation of Lya, Ha, and MgII h line profiles. We compared t…
The Bright Rim Prominences according to 2.5D Radiative Transfer
Jack M. Jenkins, Christopher M. J. Osborne, Ye Qiu +2
Solar prominences observed close to the limb commonly include a bright feature that, from the perspective of the observer, runs along the interface between itself and the underlyin…
1.5D NLTE spectral synthesis of a 3D filament/prominence simulation
J. M. Jenkins, C. M. J. Osborne, R. Keppens
Aims. We here demonstrate how the recently developed Lightweaver framework makes non-LTE (NLTE) spectral synthesis feasible on a new 3D ab-initio magnetohydrodynamic (MHD) filament…
Flare Kernels May be Smaller than You Think: Modelling the Radiative Response of Chromospheric Plasma Adjacent to a Solar Flare
Christopher M. J. Osborne, Lyndsay Fletcher
Numerical models of solar flares typically focus on the behaviour of directly-heated flare models, adopting magnetic field- aligned, plane-parallel methodologies. With high spatial…
On the Importance of Ca II Photoionisation by the Hydrogen Lyman Transitions in Solar Flare Models
Christopher M. J. Osborne, Petr Heinzel, Jana Kašparová +1
The forward fitting of solar flare observations with radiation-hydrodynamic simulations is a common technique for learning about energy deposition and atmospheric evolution during…
The Lightweaver Framework for NLTE Radiative Transfer in Python
Christopher M J Osborne, Ivan Milić
Tools for computing detailed optically thick spectral line profiles out of local thermodynamic equilibrium have always been focused on speed, due to the large computational effort…
Spectral deconvolution with deep learning: removing the effects of spectral PSF broadening
Momchil Molnar, Kevin Reardon, Christopher Osborne +1
We explore novel methods of recovering the original spectral line profiles from data obtained by instruments that sample those profiles with an extended or multipeaked spectral tra…
Thyr: A Volumetric Ray-Marching Tool for Simulating Microwave Emission
Christopher M. J. Osborne, Paulo J. A. Simões
Gyrosynchrotron radiation is produced by solar flares, and can be used to infer properties of the accelerated electrons and magnetic field of the flaring region. This microwave emi…
RADYNVERSION: Learning to Invert a Solar Flare Atmosphere with Invertible Neural Networks
Christopher M. J. Osborne, John A. Armstrong, Lyndsay Fletcher
During a solar flare, it is believed that reconnection takes place in the corona followed by fast energy transport to the chromosphere. The resulting intense heating strongly distu…