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Diagnosing the time-dependence of active region core heating from the emission measure: I. Low-frequency nanoflares
Stephen J. Bradshaw, James A. Klimchuk, Jeffrey W. Reep
Observational measurements of active region emission measures contain clues to the time-dependence of the underlying heating mechanism. A strongly non-linear scaling of the emissio…
The Role of Type II Spicules in the Upper Solar Atmosphere
J. A. Klimchuk
We examine the suggestion that most of the hot plasma in the Sun's corona comes from type II spicule material that is heated as it is ejected from the chromosphere. This contrasts…
Active Region Moss: Doppler Shifts from Hinode/EIS Observations
Durgesh Tripathi, Helen E. Mason, James A. Klimchuk
Studying the Doppler shifts and the temperature dependence of Doppler shifts in moss regions can help us understand the heating processes in the core of the active regions. In this…
Enthalpy-based Thermal Evolution of Loops: II. Improvements to the Model
Peter J. Cargill, Stephen J. Bradshaw, James A. Klimchuk
This paper develops the zero-dimensional (0D) hydrodynamic coronal loop model "Enthalpy-based Thermal Evolution of Loops" (EBTEL) proposed by Klimchuk et al (2008), which studies t…
Evidence for Widespread Cooling in an Active Region Observed with the SDO Atmospheric Imaging Assembly
Nicholeen M. Viall, James A. Klimchuk, NASA Goddard Space Flight Center
A well known behavior of EUV light curves of discrete coronal loops is that the peak intensities of cooler channels or spectral lines are reached at progressively later times than…