152 citations · 475 across the 15 of their papers we have counts for
15 papers
Flare Impulsive-phase Durations
Brian R. Dennis, Hugh Hudson, Joel Allred
This Research Note is in response to the recent paper by S. M. Perriyil et al. (2026). They provide measurements of the time delay (delta t) between the hard X-ray and soft X-ray p…
Emission Measures Demystified
Brian R. Dennis, Kenneth J. H. Phillips
We review the terms, spectral radiance and spectral irradiance, and show how their precise definitions are crucial for interpreting observations made with different instruments cov…
The Focusing Optics X-ray Solar Imager (FOXSI)
Steven Christe, Meriem Alaoui, Joel Allred +26
FOXSI is a direct-imaging, hard X-ray (HXR) telescope optimized for solar flare observations. It detects hot plasma and energetic electrons in and near energy release sites in the…
Magnetic Energy Powers the Corona: How We Can Understand its 3D Storage & Release
Amir Caspi, Daniel B. Seaton, Roberto Casini +12
The coronal magnetic field is the prime driver behind many as-yet unsolved mysteries: solar eruptions, coronal heating, and the solar wind, to name a few. It is, however, still poo…
Quasi-Periodic Pulsations during the Impulsive and Decay phases of an X-class Flare
Laura A. Hayes, Peter T. Gallagher, Brian R. Dennis +3
Quasi-periodic pulsations (QPP) are often observed in X-ray emission from solar flares. To date, it is unclear what their physical origins are. Here, we present a multi-instrument…
Flare Footpoint Regions and a Surge Observed by the Hinode/EUV Imaging Spectrometer (EIS), RHESSI, and SDO/AIA
George A. Doschek, Harry P. Warren, Brian R. Dennis +2
The Extreme-ultraviolet Imaging Spectrometer (EIS) on the Hinode spacecraft observed flare footpoint regions coincident with a surge for a M3.7 flare observed on 25 September 2011…
Science enabled by high precision inertial formation flying
G. K. Skinner, B. R. Dennis, J. F. Krizmanic +1
The capability of maintaining two satellites in precise relative position, stable in a celestial coordinate system, would enable major advances in a number of scientific discipline…
Very High Resolution Solar X-ray Imaging Using Diffractive Optics
B. R. Dennis, G. K. Skinner, M. J. Li +1
This paper describes the development of X-ray diffractive optics for imaging solar flares with better than 0.1 arcsec angular resolution. X-ray images with this resolution of the \…
The Solar Flare Iron Abundance
K. J. H. Phillips, B. R. Dennis
The abundance of iron is measured from emission line complexes at 6.65 keV (Fe line) and 8 keV (Fe/Ni line) in {\em RHESSI} X-ray spectra during solar flares. Spectra during long-d…
Fermi Detection of γ-ray emission from the M2 Soft X-ray Flare on 2010 June 12
Fermi GBM Collaboration, Fermi LAT Collaboration, B. R. Dennis +2
The GOES M2-class solar flare, SOL2010-06-12T00:57, was modest in many respects yet exhibited remarkable acceleration of energetic particles. The flare produced an ~50 s impulsive…
The Signature of Flares in VIRGO Total Solar Irradiance Measurements
A. Quesnel, B. R. Dennis, B. Fleck +2
We use Total Solar Irradiance (TSI) measurements from the VIRGO (Variability of solar IRradiance and Gravity Oscillations) instrument on board SOHO to obtain preliminary estimates…
Evidence of a Plasmoid-Looptop Interaction and Magnetic Inflows During a Solar Flare/CME Eruptive Event
Ryan O. Milligan, R. T. James McAteer, Brian R. Dennis +1
Observational evidence is presented for the merging of a downward-propagating plasmoid with a looptop kernel during an occulted limb event on 2007 January 25. RHESSI lightcurves in…
POET: POlarimeters for Energetic Transients
J. E. Hill, M. L. McConnell, P. Bloser +15
POET (Polarimeters for Energetic Transients) is a Small Explorer mission concept proposed to NASA in January 2008. The principal scientific goal of POET is to measure GRB polarizat…
RHESSI Observations of the Solar Flare Iron-line Feature at 6.7 keV
K. J. H. Phillips, C. Chifor, B. R. Dennis
Analysis of RHESSI 3--10 keV spectra for 27 solar flares is reported. This energy range includes thermal free--free and free--bound continuum and two line features, at 6.7keV and 8…
Investigation of the Neupert effect in solar flares. I. Statistical properties and the evaporation model
A. Veronig, B. Vrsnak, B. R. Dennis +3
Based on a sample of 1114 flares observed simultaneously in hard X-rays (HXR) by the BATSE instrument and in soft X-rays (SXR) by GOES, we studied several aspects of the Neupert ef…