[Loops] EIS DEM for September 24-29 2010

[Klimchuk, James A. (GSFC-6710)]

Hi all.  I have a quick comment about DEMs because I worry that some of the earlier e-mails may have left a wrong impression.  I've taken a look at Helen's DEM curves, and they are very much consistent with nanoflare heating.  The DEM at logT = 6.7 is what many of the models predict.  This does not prove nanoflare heating, but rather leaves it open as a possibility.  Helen's much reduced DEM at logT = 7.1 suggests that the nanoflares cannot be exceptionally strong.  I would caution, however, that ionization nonequilibrium effects are expected to be very important in the early stages of an event, and the true DEM may be much larger than what the observations suggest (as demonstrated by Steve and Fabio).  I also want to give credit to Brendan O'Dwyer, Helen's student who is the lead author on the paper with these results.

Happy, healthy, and productive 2010 to all!
Jim

> -----Original Message-----
> From: loops-bounces at solar.physics.montana.edu [mailto:loops-
> bounces at solar.physics.montana.edu] On Behalf Of brigitte Schmieder
> Sent: Friday, January 08, 2010 11:26 AM
> To: A mailing list for scientists involved in the observation and modeling of
> solar loop structures
> Subject: Re: [Loops] EIS DEM for September 24-29 2010
> 
> 
> Dear Helen
> Did you get some time to look at my EIS files on the AR 1026?
> 
> HAPPY NEW YEAR
> Brigitte
> 
> > Dear Jim (et al),
> >
> > there is no doubt that high temp emission (log T>6.7)
> > can be seen in the hot dense core of the AR, however the
> > EIS data do not show high temp emission (down to 3 orders
> > of magnitude below the peak DEM) in the 'warm' loops.
> > The XRT DEMs have large uncertainties. There seems to be
> > some inconsistencies between EIS and XRT DEMs, but perhaps
> > these might be resolved with the revised calibration
> > presented at Hinode-3.
> >
> > Best wishes,
> > helen
> >
> >
> >
> > --
> >
> >
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