Hi everyone,
You might be interested in the paper "Key Aspects of Coronal Heating," which can be downloaded at http://arxiv.org/abs/1410.5660. Major goals of the paper are to point out fruitful areas of future research and to encourage closer collaboration among scientists using different approaches to solve the coronal heating problem.
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.govmailto:James.A.Klimchuk@nasa.gov Homepage: http://science.gsfc.nasa.gov/sed/index.cfm?fuseAction=people.jumpBio&&am...
No endorsement by NASA is implied for any correspondence related to my official role in professional organizations.
********************************************************************************
Hi Jim,
let me remind that the deadline for abstract submission for 26 IUGG General Assembly is approaching, Jan 31.
There will be a few solar workshops dedicated to Quiet Sun and Active Regions (A32), solar flares (A30), and turbulence (A29).
The announcement for A32 is appended below.
Dear Colleagues,
We have just published a new paper: Viall, N. M. & Klimchuk, J. A., 'The Transition Region Response to a Coronal Nanoflare: Forward Modeling and Observations in SDO/AIA', 2015, ApJ, 799, 58.
It can be found here: http://stacks.iop.org/0004-637X/799/58
Abstract: The corona and transition region (TR) are fundamentally coupled through the processes of thermal conduction and mass exchange. It is not possible to understand one without the other. Yet the temperature-dependent emissions from the two locations behave quite differently in the aftermath of an impulsive heating event such as a coronal nanoflare. Whereas the corona cools sequentially, emitting first at higher temperatures and then at lower temperatures, the TR is multithermal and the emission at all temperatures responds in unison. We have previously applied the automated time lag technique of Viall & Klimchuk to disk observations of an active region (AR) made by the Atmospheric Imaging Assembly (AIA) on the Solar Dynamics Observatory. Lines of sight passing through coronal plasma show clear evidence for post-nanoflare cooling, while lines of sight intersecting the TR footpoints of coronal strands show zero time lag. In this paper, we use the EBTEL hydrodynamics code to demonstrate that this is precisely the expected behavior when the corona is heated by nanoflares. We also apply the time lag technique for the first time to off-limb observations of an AR. Since TR emission is not present above the limb, the occurrence of zero time lags is greatly diminished, supporting the conclusion that zero time lags measured on the disk are due to TR plasma. Lastly, we show that the ''coronal'' channels in AIA can be dominated by bright TR emission. When defined in a physically meaningful way, the TR reaches a temperature of roughly 60% the peak temperature in a flux tube. The TR resulting from impulsive heating can extend to 3 MK and higher, well within the range of the ''coronal'' AIA channels.
Cheers,
Nicki
*************************** Nicholeen M. Viall Research Astrophysicist Solar Physics Laboratory Code 671 NASA Goddard Space Flight Center Greenbelt, MD 20771 V: 301-286-4054 F: 301-286-7194 Nicholeen.M.Viall@nasa.gov
Hi Folk,
Loops VII takes place this week at DAMTP, CMS, Univ of Cambridge, UK. Not a holiday resort, but we do have the river Cam and some good pubs.
If you are not able to come, then take a look at our website, and follow Us on Facebook and Twitter.
You can always join in the discussion on-line, also notify us of any of your Recent papers on the subject.
You can't however enjoy the social events on-line, but you can see photos Of us enjoying them, which is almost as good!!
We are looking forward to an animated and enjoyable week.
Helen On behalf of SOC and LOC
Dear All, You might be interested in our recently published paper in Astron. Astrophys. (2015) Volume *573*, id.A4, 7 pp. titled: "*Alfvenic Waves in Polar Spicules* " possibly dealing with the wave aspect of the coronal heating and the fast wind with extremely small loops at the feet.
It is available from http://arxiv.org/abs/1409.7654 or ask me a .pdf copy of the printed variant. After is the abstract:
Best wishes, S.
Le 16/01/2015 15:30, Klimchuk, James A. (GSFC-6710) a écrit :
Hi everyone,
You might be interested in the paper "Key Aspects of Coronal
Heating," which can be downloaded at http://arxiv.org/abs/1410.5660. Major goals of the paper are to point out fruitful areas of future research and to encourage closer collaboration among scientists using different approaches to solve the coronal heating problem.
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
Homepage: http://science.gsfc.nasa.gov/sed/index.cfm?fuseAction=people.jumpBio&&am...
No endorsement by NASA is implied for any correspondence related to my official role in professional organizations.
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