activity
20012025
most citedCollisional Ionization Equilibrium for Optically Thin Plasmas. I. Updated Recombination Rate Coefficients for Bare though Sodium-like Ions

156 citations · 554 across the 26 of their papers we have counts for

collaborators

26 papers

astro-ph.SR2025

Formation of a Coronal Hole by a quiet-Sun Filament Eruption

Stefan J. Hofmeister, Eleanna Asvestari, Karin Dissauer +9

A coronal hole formed as a result of a quiet-Sun filament eruption close to the solar disk center on 2014 June 25. We studied this formation using images from the Atmospheric Imagi…

astro-ph.SR2025

Velocity and Density Fluctuations in the Quiet Sun Corona

Michael Hahn, Xiangrong Fu, Stefan J. Hofmeister +3

We investigate the properties and relationship between Doppler-velocity fluctuations and intensity fluctuations in the off-limb quiet Sun corona. These are expected to reflect the…

astro-ph.SR2025

Elemental Abundances at Coronal Hole Boundaries as a Means to Investigate Interchange Reconnection and the Solar Wind

Alexandros Koukras, Daniel W. Savin, Michael Hahn

The origin of the slow solar wind is not well understood, unlike the fast solar wind which originates from coronal holes. In-situ elemental abundances of the slow solar wind sugges…

physics.plasm-ph2025

Measurement of energy reduction by inertial Alfvén waves propagating through parallel gradients in the Alfvén speed

Garima Joshi, Sayak Bose, Troy Carter +4

We have studied the propagation of inertial Alfvén waves through parallel gradients in the Alfvén speed using the Large Plasma Device at the University of California, Los Angeles.…

astro-ph.SR2024

Revised Point-Spread Functions for the Atmospheric Imaging Assembly onboard the Solar Dynamics Observatory

Stefan Hofmeister, Daniel Wolf Savin, Michael Hahn

We present revised point-spread functions (PSFs) for the Atmospheric Imaging Assembly (AIA) onboard the Solar Dynamics Observatory (SDO). These PSFs provide a robust estimate of th…

astro-ph.SR2024★ 4 cited

High-Resolution Laboratory Measurements of M-shell Fe EUV Line Emission using EBIT-I

Alexander J. Fairchild, Natalie Hell, Peter Beiersdorfer +4

Solar physicists routinely utilize observations of Ar-like Fe IX and Cl-like Fe X emission to study a variety of solar structures. However, unidentified lines exist in the Fe IX an…