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,
_______________________________________________
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Loops(a)solar.physics.montana.edu
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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).
********************************************************************************
Dear all,
here is a link to another paper, accepted for publication on ApJ, presenting
an analysis of Chandra high-resolution stellar spectra to test the
accuracy and
completeness of the atomic data of CHIANTI 6 for SDO analyses
http://adsabs.harvard.edu/abs/2011arXiv1110.4611T
cheers,
Paola
"Testing EUV/X-ray Atomic Data for the Solar Dynamics Observatory"
Paola Testa, Jeremy J. Drake, Enrico Landi
ABSTRACT
The Atmospheric Imaging Assembly (AIA) and the Exteme-ultraviolet
Variability Experiment (EVE) onboard the Solar Dynamics Observatory
include spectral windows in the X-ray/EUV band. Accuracy and
completeness of the atomic data in this wavelength range is essential
for interpretation of the spectrum and irradiance of the solar corona,
and of SDO observations made with the AIA and EVE instruments. Here we
test the X-ray/EUV data in the CHIANTI database to assess their
completeness and accuracy in the SDO bands, with particular focus on the
94A and 131A AIA passbands. Given the paucity of solar observations
adequate for this purpose, we use high-resolution X-ray spectra of the
low-activity solar-like corona of Procyon obtained with the Chandra Low
Energy Transmission Grating Spectrometer (LETGS). We find that while
spectral models overall can reproduce quite well the observed spectra in
the soft X-ray range <~ 50A, and at the EUV wavelengths >~ 130A, they
significantly underestimate the observed
flux in the 50-130A wavelength range. The model underestimates the
observed flux by a variable factor ranging from ~1.5, at short
wavelengths below ~50A, up to ~5-7 in the ~70−125A range. In the AIA
bands covered by LETGS, i.e. 94A and 131A , we find that the observed
flux can be underestimated by large factors (~3 and ~1.9 respectively,
for the case of Procyon presented here). We discuss the consequences for
analysis of AIA data and possible empirical corrections to the AIA
responses to model more realistically the coronal emission in these
passbands.
Dear all,
Here is a link to a preprint, accepted for publication in A&A,
presenting new calculations of Fe VIII & Fe IX atomic data relevant to
the SDO AIA 94 A channel.
http://www.damtp.cam.ac.uk/user/astro/bo234/publications/17926.pdf
Best regards,
Brendan O'Dwyer