Hi everyone,
In the spirit of a number of recent papers that have been focused on trying
to determine the dominant components of the emission in the wavelength
channels of imaging instruments (AIA, in particular), Jim and I would like
to share with you all a link to a paper on this very topic that was recently
published in the ApJ Supplement Series:
http://iopscience.iop.org/0067-0049/194/2/26/pdf/apjs_194_2_26.pdf
Our aim in carrying out the work described in this paper was to provide a
large amount of quantitative data from our modeling studies that we hope
will be of use in the analysis of observationally gathered data.
Best wishes,
Steve
-----Original Message-----
From: loops-bounces(a)solar.physics.montana.edu
[mailto:loops-bounces@solar.physics.montana.edu] On Behalf Of Paola Testa
Sent: Tuesday, September 20, 2011 10:00 AM
To: A mailing list for scientists involved in the observation and modeling
of solar loop structures
Cc: Juan Martinez Sykora
Subject: [Loops] Forward modeling of emission in SDO/AIA passbands from
dynamic 3D simulations
Hello all,
here is a link to a preprint of a paper, accepted for publication on ApJ,
that is also discussing issues related to the interpretation of AIA
observations:
http://adsabs.harvard.edu/abs/2011arXiv1109.0704M
cheers,
Paola
On 9/9/11 12:03 PM, Giulio Del Zanna wrote:
>
> Dear colleagues,
>
> here is a link to a preprint that discusses various
> (important) issues related to the interpretation of AIA data:
>
> http://solar.physics.montana.edu/cgi-bin/eprint/index.pl?entry=15555
>
> Those of you that were present at the excellent Mallorca meeting might
> recall the issues we raised there. The paper, which follows on from
> O'Dwyer et al., contains more.
>
> I encourage all to follow the example in the Appendix to calculate
> your own AIA responses using CHIANTI. We will soon release v.7, but do
> not expect huge differences.
> We are working to try and improve the atomic data for AIA, more to come.
>
>
> best wishes,
_______________________________________________
Loops mailing list
Loops(a)solar.physics.montana.edu
https://mithra.physics.montana.edu/mailman/listinfo/loops
Hi Loopsters,
We enjoyed a very successful workshop in Mallorca. Many thanks to the SOC and LOC and especially to their chairs, Inaki Ugarte Urra and Jose Luis Ballester, respectively. These guys put in a lot of hard work.
We also thank Spiro Antiochos, Joan Schmelz, and Robert Walsh, whose terms on the Steering Committee are ending. Please send me nominations for their replacements, including self nominations. The Steering Committee will then vote from a list of candidates. (Spiro, Joan, and Robert are eligible to serve again.)
It's never too early to start planning for the next workshop, in 2 years. Please contact me if you are interested in hosting. We have some tentative offers already, but they are highly tentative at this time.
Best wishes,
Jim
********************************************************************************
James A. Klimchuk
NASA Goddard Space Flight Center
Solar Physics Lab, Code 671
Bldg. 21, Rm. 158
Greenbelt, MD 20771
USA
Phone: 1-301-286-9060
Fax: 1-301-286-7194
E-mail: James.A.Klimchuk(a)nasa.gov<mailto:James.A.Klimchuk@nasa.gov>
Home page: http://science.gsfc.nasa.gov/671/staff/bios/cs/James_Klimchuk_ssi.html
No endorsement by NASA is implied for any correspondence related to my role as an officer of professional organizations (American Geophysical Union, American Astronomical Society, International Astronomical Union).
********************************************************************************
I am pleased to announce that Susanna Parenti, Inaki Ugarte Urra, and Nicki Viall have been elected to the Coronal Loops Workshops Steering Committee to replace outgoing members Spiro Antiochos, Joan Schmelz, and Robert Walsh. In addition, Fabio Reale has been elected the new chair. The committee will now begin to evaluate the proposals we have received for hosting the summer 2013 workshop. Additional proposals are still welcomed.
Thanks,
Jim
********************************************************************************
James A. Klimchuk
NASA Goddard Space Flight Center
Solar Physics Lab, Code 671
Bldg. 21, Rm. 158
Greenbelt, MD 20771
USA
Phone: 1-301-286-9060
Fax: 1-301-286-7194
E-mail: James.A.Klimchuk(a)nasa.gov<mailto:James.A.Klimchuk@nasa.gov>
Homepage: https://sedupdate.gsfc.nasa.gov/sed/index.cfm?fuseAction=people.jumpBio&&iP…
No endorsement by NASA is implied for any correspondence related to my role as an officer of professional organizations (American Geophysical Union, International Astronomical Union, American Astronomical Society).
********************************************************************************
Dear colleagues
please find at the following link the preprint of a work accepted
for publication in Astronomy & Astrophysics, showing the importance of
updating the radiative losses on loop modeling, in particular on the
very late phases of pulse-heated loop evolution:
http://arxiv.org/abs/1205.4553
This work may help to understand, for instance, why we see much fewer
warm loops in active regions, than expected from a model of loop cooling
from a hotter status. Special thanks to Peter Cargill for useful
suggestions on the analytic part. Please contact me if you wish to have
a 2-column version of the preprint.
The abstract is below.
Best regards
Fabio Reale
The role of radiative losses in the late evolution of pulse-heated
coronal loops/strands
F. Reale, E. Landi
Abstract: Radiative losses from optically thin plasma are an important
ingredient for modeling plasma confined in the solar corona. Spectral
models are continuously updated to include the emission from more
spectral lines, with significant effects on radiative losses, especially
around 1 MK. We investigate the effect of changing the radiative losses
temperature dependence due to upgrading of spectral codes on predictions
obtained from modeling plasma confined in the solar corona. The
hydrodynamic simulation of a pulse-heated loop strand is revisited
comparing results using an old and a recent radiative losses function.
We find significant changes in the plasma evolution during the late
phases of plasma cooling: when the recent radiative loss curve is used,
the plasma cooling rate increases significantly when temperatures reach
1-2 MK. Such more rapid cooling occurs when the plasma density is larger
than a threshold value, and therefore in impulsive heating models that
cause the loop plasma to become overdense. The fast cooling has the
effect of steepening the slope of the emission measure distribution of
coronal plasmas with temperature at temperatures lower than ~2 MK. The
effects of changes in the radiative losses curves can be important for
modeling the late phases of the evolution of pulse-heated coronal loops,
and, more in general, of thermally unstable optically thin plasmas.
--
*****************************************************************************
Dr. Fabio Reale, Ph.D.
Professore Associato
Dipartimento di Fisica, Universita` di Palermo
P.za Parlamento 1, 90134 Palermo - ITALY
Tel: +39 091 233 237
Fax: +39 091 233 444
*****************************************************************************