191 citations · 2.4k across the 61 of their papers we have counts for
61 papers
A Search for High-Frequency Coronal Brightness Variations in the 21 August 2017 Total Solar Eclipse
P. Rudawy, K. Radziszewski, A. Berlicki +4
We report on a search for short-period intensity variations in the green-line FeXIV 530.3 nm emission from the solar corona during the 21 August 2017 total eclipse viewed from Idah…
A Si IV/O IV electron density diagnostic for the analysis of IRIS solar spectra
P. R. Young, F. P. Keenan, R. O. Milligan +1
Solar spectra of ultraviolet bursts and flare ribbons from the Interface Region Imaging Spectrograph (IRIS) have suggested high electron densities of cm at transi…
The formation of small-scale umbral brightenings in sunspot atmospheres
C. J. Nelson, V. M. J. Henriques, M. Mathioudakis +1
Sunspot atmospheres are highly inhomogeneous hosting both quasi-stable and transient features, such as `umbral micro-jets' and dark fibril-like events. We seek to understand the mo…
An assessment of Fe XX - Fe XXII emission lines in SDO/EVE data as diagnostics for high density solar flare plasmas using EUVE stellar observations
F. P. Keenan, R. O. Milligan, M. Mathioudakis +1
The Extreme Ultraviolet Variability Experiment (EVE) on the Solar Dynamics Observatory obtains extreme-ultraviolet (EUV) spectra of the full-disk Sun at a spectral resolution of ~1…
Electron impact excitation rates for transitions in Mg V
K M Aggarwal, F P Keenan
Energy levels, radiative rates (A-values) and lifetimes, calculated with the GRASP code, are reported for an astrophysically important O-like ion Mg~V. Results are presented for tr…
Departure of high temperature iron lines from the equilibrium state in flaring solar plasmas
Tomoko Kawate, Francis P. Keenan, David B. Jess
The aim of this study is to clarify if the assumption of ionization equilibrium and a Maxwellian electron energy distribution is valid in flaring solar plasmas. We analyze the 2014…