[Loops] loops and thermal nonequilibrium

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

Oops, forgot to attach the paper.  Here it is.

Jim

> -----Original Message-----
> From: loops-bounces at solar.physics.montana.edu [mailto:loops-
> bounces at solar.physics.montana.edu] On Behalf Of Harry Warren
> Sent: Sunday, December 06, 2009 6:19 PM
> To: A mailing list for scientists involved in the observation and modeling of
> solar loop structures
> Subject: Re: [Loops] loops and thermal nonequilibrium
> 
> 
> Leon,
> 
> As I recall, your paper with Amy relied on footpoint heating, which does
> lead to higher apex densities and flatter temperature ratios. The observed
> densities near 1 MK are so high, however, that the loops become
> thermodynamically unstable. Also, the high speed EIS flows are typically
> seen in faint regions and are not associated with the types of loops that
> Jim is attempting to model.
> 
> Harry
> 
> 
> On 12/5/09 3:16 PM, "Leon Golub" <golub at cfa.harvard.edu> wrote:
> 
> > Jim,
> >
> > Amy and I addressed the issues of excess density, flat temperature
> > profiles and large scale height about 10 years ago. Having flows of
> > 30-40 km/sec, as is observed in TRACE and now verified by EIS, solves
> > these problems quite nicely. So there is a viable mechanism other than
> > nanoflares.
> >
> > Leon
> >
> >
> > Klimchuk, James A. (GSFC-6710) wrote:
> >> Dear Loops Friends,
> >>
> >>
> >>
> >>     If you are interested, the attached paper shows that coronal loops
> >> cannot be explained by thermal nonequilibrium.  The results appear to
> >> rule out the widespread existence of coronal heating that is both highly
> >> concentrated low in the corona and steady or quasi-steady (slowly
> >> varying or impulsive with a rapid cadence).  Comments are welcomed.
> >>
> >>
> >>
> >> 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 at nasa.gov
> <mailto:James.A.Klimchuk at nasa.gov>
> >>
> >> Home page:  http://hsd.gsfc.nasa.gov/staff/bios/cs/James_Klimchuk.html
> >>
> >>
> >>
> >>
> **************************************************************
> ***************
> >> ***
> >>
> >>
> >>
> >>
> >> ------------------------------------------------------------------------
> >>
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> --
> // ---------------------------------------------------------------------
> // Harry P. Warren             phone : 202-404-1453
> // Naval Research Laboratory   fax   : 202-404-7997
> // Code 7673HW                 email : hwarren at nrl.navy.mil
> // Washington, DC 20375        www   : http://tcrb.nrl.navy.mil/~hwarren
> // ---------------------------------------------------------------------
> 
> 
> 
> 
> 
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