Dear all,
the following paper has recently been accepted by ApJ Letters. You can find a copy of the paper and relevant movies at www.lmsal.com/~ptesta/hic_moss/
thanks, Paola
title: Observing coronal nanoflares in active region moss
authors: P. Testa, B. De Pontieu, J. Martinez-Sykora, E. DeLuca, V. Hansteen, J. Cirtain, A. Winebarger, L. Golub, K. Kobayashi, K. Korreck, S. Kuzin, R. Walsh, C. DeForest, A. Title, M.Weber
abstract: The High-resolution Coronal Imager (Hi-C) has provided Fe XII 193A images of the upper transition region moss at an unprecedented spatial (~0.3-0.4 arcsec) and temporal (5.5s) resolution. The Hi-C observations show in some moss regions variability on timescales down to ~15s, significantly shorter than the minute scale variability typically found in previous observations of moss, therefore challenging the conclusion of moss being heated in a mostly steady manner. These rapid variability moss regions are located at the footpoints of bright hot coronal loops observed by SDO/AIA in the 94A channel, and by Hinode/XRT. The configuration of these loops is highly dynamic, and suggestive of slipping reconnection. We interpret these events as signatures of heating events associated with reconnection occurring in the overlying hot coronal loops, i.e., coronal nanoflares. We estimate the order of magnitude of the energy in these events to be of at least a few $10^{23}$~erg, also supporting the nanoflare scenario. These Hi-C observations suggest that future observations at comparable high spatial and temporal resolution, with more extensive temperature coverage are required to determine the exact characteristics of the heating mechanism(s).
Dear all,
as some of you have noticed, I've recently put on
http://solar.physics.montana.edu/cgi-bin/eprint/default_page.pl
two papers accepted for publication, one on SDO/EVE flare lines and one on the Hinode/EIS calibration. This latter is of more general interest because the corrections to EIS data from 2010 onwards are substantial (factors of two or more). I wrote a simple IDL routine to return the corrections to the previously-calibrated data. This is being tested within the EIS-soft distribution list before inclusion in the EIS software.
Giulio
Dear all,
following a few requests during the loop workshop this week, I attach here a simple routine to apply my EIS calibration (as described in the appendix of the paper) and also find the correction factors for data that were previously calibrated using the ground calibration.
Giulio
On May 15 2013, Dr G. Del-Zanna wrote:
Sorry- a small software bug spotted by Harry Warren (thanks!)
in line 149 n1 should have been n2. Corrected routine attached.
Giulio
Dear all,
I've put in the solar archive a paper which summarises my work on ARs in the past year, and that I presented at the last loop workshop. See
http://solar.physics.montana.edu/cgi-bin/eprint/index.pl?entry=18532
There are about a dozen new results covering a wide range of topics. They are based on Hi-C, AIA and EIS observations. Main new results are on elemental abundances and Hi-C.
Is there an english mother-tongue willing to read carefully the entire paper for language editing ? A&A is short of editors during the summer!
Giulio
Dear All,
The following article has been accepted for publication in the journal Entropy: Aschwanden,M.J., DePontieu, B., and Katrukha, E. 2013, Entropy, Special Issue on Advanced Signal Processing in Heliospheric Physics, ... (in press)
URL1="http://www.lmsal.com/~aschwand/eprints/2013_entropy.pdf"
Optimization of Curvi-Linear Tracing Applied to Solar Physics and Biophysics
The code can also be accessed in SSW. A tutorial is given at:
http://www.lmsal.com/~aschwand/software/tracing/tracing_tutorial1.html
Share and enjoy, Markus
_______________________________________ Dr. Markus J. Aschwanden Solar & Astrophysics Laboratory Lockheed Martin Advanced Techology Center Org. ADBS, Bldg. 252 3251 Hanover St., Palo Alto, CA 94304, USA Phone: 650-424-4001, FAX: 650-424-3994 URL: http://www.lmsal.com/~aschwand/ e-mail: aschwanden@lmsal.com _______________________________________
We are pleased to announce that
'Loops7: Heating of the Magnetically Closed Corona'
will be held 21-23 July 2015 at the Center for Mathematical Science, University of Cambridge, UK (still UK at least for today!)
The SOC members are:
Caroline Alexander Inigo Arregui Stephen Bradshaw David Brooks Leon Golub Viggo Hansteen Helen Mason (chair) Susanna Parenti (Chair of Loops6 SOC)
The Chair of the LOC is Giulio Del Zanna.
Amy is the Chair of the Loops Steering Committee.
We look forward to welcoming you in Cambridge. Please note that we intend this meeting to be well focussed and to be a discussion meeting, so abstracts for talks or posters which do not directly relate to the topic, will not be accepted.
Helen (Mason) Chair of SOC
loops@solar.physics.montana.edu