322 citations · 1.4k across the 23 of their papers we have counts for
19 papers · 1 filter
Reduction of the downward energy flux of non-thermal electrons in the solar flare corona due to co-spatial return current losses
Meriem Alaoui, Gordon D. Holman, Marc Swisdak
High energy electrons carry much of a solar flare's energy. Therefore, understanding changes in electron beam distributions during their propagation is crucial. A key focus of this…
Role of Suprathermal Runaway Electrons Returning to the Acceleration Region in Solar Flares
Meriem Alaoui, Gordon D. Holman, Joel C. Allred +1
During solar flares, a large flux of energetic electrons propagate from the tops of reconnecting magnetic flux tubes toward the lower atmosphere. Over the course of the electrons'…
Solar Flare Energy Partitioning and Transport -- the Gradual Phase (a Heliophysics 2050 White Paper)
Graham S. Kerr, Meriem Alaoui, Joel C. Allred +14
Solar flares are a fundamental component of solar eruptive events (SEEs; along with solar energetic particles, SEPs, and coronal mass ejections, CMEs). Flares are the first compone…
Solar Flare Energy Partitioning and Transport -- the Impulsive Phase (a Heliophysics 2050 White Paper)
Graham S. Kerr, Meriem Alaoui, Joel C. Allred +14
Solar flares are a fundamental component of solar eruptive events (SEEs; along with solar energetic particles, SEPs, and coronal mass ejections, CMEs). Flares are the first compone…
CME-driven Shock and Type II Solar Radio Burst Band Splitting
Nicolina Chrysaphi, Eduard P. Kontar, Gordon D. Holman +1
Coronal Mass Ejections (CMEs) are believed to be effective in producing shocks in the solar corona and the interplanetary space. One of the important signatures of shocks and shock…
Detection and Interpretation Of Long-Lived X-Ray Quasi-Periodic Pulsations in the X-Class Solar Flare On 2013 May 14
Brian R. Dennis, Anne K. Tolbert, Andrew Inglis +5
Quasi-periodic pulsations (QPP) seen in the time derivative of the GOES soft X-ray light curves are analyzed for the near-limb X3.2 event on 14 May 2013. The pulsations are apparen…
Understanding breaks in solar flares x-ray spectra: Evaluation of a co-spatial return-current model
Meriem Alaoui, Gordon Holman
Hard x-ray spectral breaks are explained in terms of a 1D model with a co-spatial return current. We study 19 flares observed by RHESSI (Ramaty High Energy Solar Spectroscopic Imag…
Global Energetics of Solar Flares: V. Energy Closure in Flares and Coronal Mass Ejections
Markus J. Aschwanden, Amir Caspi, Christina M. S. Cohen +11
In this study we synthesize the results of four previous studies on the global energetics of solar flares and associated coronal mass ejections (CMEs), which include magnetic, ther…
Exploring impulsive solar magnetic energy release and particle acceleration with focused hard X-ray imaging spectroscopy
Steven Christe, Samuel Krucker, Lindsay Glesener +37
How impulsive magnetic energy release leads to solar eruptions and how those eruptions are energized and evolve are vital unsolved problems in Heliophysics. The standard model for…
Global Energetics of Solar Flares: III. Non thermal Energies
Markus J. Aschwanden, Gordon Holman, Aidan O'Flannagain +3
This study entails the third part of a global flare energetics project, in which Ramaty High-Energy Solar Spectroscopic Imager (RHESSI) data of 191 M and X-class flare events from…
X-ray Source Heights in a Solar Flare: Thick-target versus Thermal Conduction Front Heating
Jeffrey W. Reep, Stephen J. Bradshaw, Gordon D. Holman
Observations of solar flares with RHESSI have shown X-ray sources traveling along flaring loops, from the corona down to the chromosphere and back up. The 28 November 2002 C1.1 fla…
Solar Eruptive Events (SEE) 2020 Mission Concept
R. P. Lin, A. Caspi, S. Krucker +20
Major solar eruptive events (SEEs), consisting of both a large flare and a near simultaneous large fast coronal mass ejection (CME), are the most powerful explosions and also the m…
Imaging coronal magnetic-field reconnection in a solar flare
Yang Su, Astrid M. Veronig, Gordon D. Holman +4
Magnetic-field reconnection is believed to play a fundamental role in magnetized plasma systems throughout the Universe1, including planetary magnetospheres, magnetars and accretio…
Solar Flare X-ray Source Motion as a Response to Electron Spectral Hardening
A. O'Flannagain, P. Gallagher, J. Brown +2
Context: Solar flare hard X-rays (HXRs) are thought to be produced by nonthermal coronal electrons stopping in the chromosphere, or remaining trapped in the corona. The collisional…
Estimating the properties of hard X-ray solar flares by constraining model parameters
Jack Ireland, Anne K. Tolbert, Richard A. Schwartz +2
We compare four different methods of calculating uncertainty estimates in fitting parameterized models to RHESSI X-ray spectra, considering only statistical sources of error. Three…
Low-Altitude Reconnection Inflow-Outflow Observations during a 2010 November 3 Solar Eruption
S. L. Savage, G. Holman, K. K. Reeves +3
For a solar flare occurring on 2010 November 3, we present observations using several SDO/AIA extreme-ultraviolet (EUV) passbands of an erupting flux rope followed by inflows sweep…
Deducing Electron Properties From Hard X-Ray Observations
E. P. Kontar, J. C. Brown, A. G. Emslie +11
X-radiation from energetic electrons is the prime diagnostic of flare-accelerated electrons. The observed X-ray flux (and polarization state) is fundamentally a convolution of the…
Implications of X-ray Observations for Electron Acceleration and Propagation in Solar Flares
Gordon D. Holman, Markus J. Aschwanden, Henry Aurass +6
High-energy X-rays and gamma-rays from solar flares were discovered just over fifty years ago. Since that time, the standard for the interpretation of spatially integrated flare X-…
Episodic X-ray Emission Accompanying the Activation of an Eruptive Prominence: Evidence of Episodic Magnetic Reconnection
Wei Liu, Tong-Jiang Wang, Brian R. Dennis +1
We present an X-ray imaging and spectroscopic study of a partially occulted C7.7 flare on 2003 April 24 observed by RHESSI that accompanied a prominence eruption observed by TRACE.…