60 citations · 220 across the 13 of their papers we have counts for
13 papers
Mass Flows in Expanding Coronal Loops
Jeffrey W. Reep, Roger B. Scott, Sherry Chhabra +2
An expansion of cross-sectional area directly impacts the mass flow along a coronal loop, and significantly alters the radiative and hydrodynamic evolution of that loop as a result…
Assessing the Performance of the ADAPT and AFT Flux Transport Models Using In-Situ Measurements From Multiple Satellites
Kalman J. Knizhnik, Micah J. Weberg, Elena Provornikova +7
The launches of Parker Solar Probe (Parker) and Solar Orbiter (SolO) are enabling a new era of solar wind studies that track the solar wind from its origin at the photosphere, thro…
Observational Signatures of Coronal Heating in MHD Simulations Without Radiation or a Lower Atmosphere
James A. Klimchuk, Kalman J. Knizhnik, Vadim M. Uritsky
It is extremely difficult to simulate the details of coronal heating and also make meaningful predictions of the emitted radiation. Thus, testing realistic models with observations…
Characterizing the Umbral Magnetic Knots of -Sunspots
A. A. Norton, P. J. Levens, K. J. Knizhnik +2
Delta ()-spots are active regions (ARs) in which positive and negative umbrae share a penumbra. They are known to be the source of strong flares. We introduce a new quantity, th…
The Rise and Emergence of Untwisted Toroidal Flux Ropes on the Sun
Kalman J. Knizhnik, James E. Leake, Mark G. Linton +1
Magnetic flux ropes (MFRs) rising buoyantly through the Sun's convection zone are thought to be subject to viscous forces preventing them from rising coherently. Numerous studies h…
Nanoflare Diagnostics from Magnetohydrodynamic Heating Profiles
Kalman J. Knizhnik, Will T. Barnes, Jeffrey W. Reep +1
The nanoflare paradigm of coronal heating has proven extremely promising for explaining the presence of hot, multi-million degree loops in the solar corona. In this paradigm, local…
What determines the X-ray intensity and duration of a solar flare?
Jeffrey W. Reep, Kalman J. Knizhnik
Solar flares are observed and classified according to their intensity measured with the GOES X-ray Sensors. We show that the duration of a flare, as measured by the full width at h…
The Role of Twist in Kinked Flux Rope Emergence and Delta-Spot Formation
Kalman J. Knizhnik, Mark G. Linton, C. Richard DeVore
It has been observationally well established that the magnetic configurations most favorable for producing energetic flaring events reside in delta-spots, a class of sunspots defin…
The Mechanism for the Energy Buildup Driving Solar Eruptive Events
Kalman J. Knizhnik, Spiro K. Antiochos, C. Richard DeVore +1
The underlying origin of solar eruptive events (SEEs), ranging from giant coronal mass ejections to small coronal-hole jets, is that the lowest-lying magnetic flux in the Sun's cor…
The Role of Magnetic Helicity in Structuring the Solar Corona
Kalman J. Knizhnik, Spiro K. Antiochos, C. Richard DeVore
Two of the most widely observed and yet most puzzling features of the Sun's magnetic field are coronal loops that are smooth and laminar and prominences/filaments that are strongly…
The Role of Magnetic Helicity in the Structure and Heating of the Sun's Corona
Kalman J. Knizhnik
Two of the most important features of the solar atmosphere are its hot, smooth coronal loops and the concentrations of magnetic shear, known as filament channels, that reside above…
Nonlinear MHD waves in a Prominence Foot
Leon Ofman, Kalman Knizhnik, Therese Kucera +1
We study nonlinear waves in a prominence foot using 2.5D MHD model motivated by recent high-resolution observations with Hinode/SOT in Ca~II emission of a prominence on October 10,…
Propagating Waves Transverse to the Magnetic Field in a Solar Prominence
B. Schmieder, T. A. Kucera, K. Knizhnik +3
We report an unusual set of observations of waves in a large prominence pillar which consist of pulses propagating perpendicular to the prominence magnetic field. We observe a huge…