Harry,
The work relied on asymmetric heating which gave rise the flow. The heating input was a generic exponential, adjust to fit the observed intensity in one TRACE channel and the result then also reproduced the other channel without further adjustment.
Leon Sent from my Verizon Wireless BlackBerry
-----Original Message----- From: Harry Warren harry.warren@nrl.navy.mil Date: Mon, 07 Dec 2009 08:19:04 To: A mailing list for scientists involved in the observation and modeling ofsolar loop structuresloops@mithra.physics.montana.edu 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@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@nasa.gov mailto:James.A.Klimchuk@nasa.gov
Home page: http://hsd.gsfc.nasa.gov/staff/bios/cs/James_Klimchuk.html
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