Hello everyone,
Here are two new papers by Peter Cargill and me that may be of interest to you.
The first "The influence of numerical resolution on coronal density in hydrodynamic models of impulsive heating" takes what we believe to be a long-overdue look at the issues surrounding the question of grid resolution in numerical models and some of the physical implications of under-resolving particular regions of the solar atmosphere. The paper has already been published by ApJ and can be obtained here: http://iopscience.iop.org/0004-637X/770/1/12/pdf/0004-637X_770_1_12.pdf
The second "The Cooling of Coronal Plasmas. iv: Catastrophic Cooling of Loops" is a continuation of our series on the relevant cooling processes in the solar atmosphere. Here we provide a physical explanation of the onset of catastrophic cooling, which may provide an explanation for the relatively weak active region emission detected in wavelength channels sensitive to lower temperature lines. The manuscript has been accepted for publication by ApJ and is available on astro-ph: http://arxiv.org/ftp/arxiv/papers/1305/1305.5484.pdf
Hope to see many of you in Montana!
Best,
Steve
Dr Stephen J. Bradshaw
(Assistant Professor of Physics and Astronomy)
Department of Physics and Astronomy, MS-108,
Rice University,
6100 Main Street,
Houston,
TX 77005,
USA.
Tel: +1 713 348 4045
Email: stephen.bradshaw@rice.edu
Hello everyone,
ApJ has just accested our paper "Can the DEM constrain the timescale of energy deposition in the solar corona?" that may be of interest to you.
Abstract: "In this paper, the ability of the Hinode/EIS instrument to detect radiative signatures of coronal heating is investigated. Recent observational studies of AR cores suggest that both the low and high frequency heating mechanisms are consistent with observations. Distinguishing between these possibilities is important for identifying the physical mechanism(s) of the heating. The Differential Emission Measure (DEM) tool is one diagnostic that allows to make this distinction, through the amplitude of the DEM slope coolward of the coronal peak. It is therefore crucial to understand the uncertainties associated with these measurements. Using proper estimations of the uncertainties involved in the problem of DEM inversion, we derive confidence levels on the observed DEM slope. Results show that the uncertainty in the slope reconstruction strongly depends on the number of lines constraining the slope. Typical uncertainty is estimated to be about +/- 1.0, in the more favorable cases. "
You can download a copy at astro-ph until it is officially published by ApJ:
http://arxiv.org/abs/1306.3114
Best regards, Chloé Guennou.
loops@solar.physics.montana.edu