Hello all,
Thank you very much to everyone who nominated colleagues, and submitted
self-nominations, to the Loops Workshops Steering Committee. The votes are
in and I am very pleased to announce the following new committee members:
Clara Froment (Center National De La Recherche Scientifique)
Boris Gudiksen (Rosseland Center for Solar Physics, University of Oslo)
Amy Winebarger (NASA Marshall Space Flight Center)
Congratulations to all!
The full Steering Committee is:
David Brooks (US Naval Research Laboratory)
Philippa Browning (University of Manchester)
Ineke De Moortel (University of St. Andrews)
Giulio Del Zanna (University of Cambridge)
Clara Froment (Center National De La Recherche Scientifique)
Boris Gudiksen (Rosseland Center for Solar Physics, University of Oslo)
Fabio Reale (University of Palermo)
Durgesh Tripathi (Inter-University Centre for Astronomy and Astrophysics)
Amy Winebarger (NASA Marshall Space Flight Center)
I would like to thank Paola Testa and Viggo Hansteen, who are rotating off
with me and have both served full six year terms, for their time and
contributions to the Steering Committee, and to the workshops they have been
involved in organizing.
The first order of business for the new committee will be to elect a new
Chairperson, who will be announced in due course.
Best wishes,
Steve
From: Stephen Bradshaw <stephen.bradshaw(a)rice.edu>
Sent: Sunday, May 24, 2020 11:25 PM
To: 'loops(a)solar.physics.montana.edu' <loops(a)solar.physics.montana.edu>
Subject: Call for Nominations to the Coronal Loops Workshops Steering
Committee
Dear Colleagues,
The Coronal Loops Workshop series, inaugurated in Paris (2002) with the most
recent Workshop in St. Andrews (2019), has been tremendously successful in
bringing together researchers from all over the world to discuss current
problems related to the physics of closed magnetic structures in the solar
corona, and to present their progress toward solving them. The Workshops
have also provided an excellent venue for young researchers to participate
in discussions and to showcase their work.
The Steering Committee for the Coronal Loops Workshops is responsible for
soliciting and selecting Workshop proposals, and assisting / advising each
Scientific Organizing Committee in choosing a topical, over-arching theme
and setting an agenda and goals for their Workshop.
The current members of the Steering Committee are: Steve Bradshaw [Chair];
David Brooks; Philippa Browning; Ineke De Moortel; Giulio Del Zanna; Viggo
Hansteen; Fabio Reale; Paola Testa; Durgesh Tripathi.
Three members of the Steering Committee (Steve Bradshaw, Viggo Hansteen, and
Paola Testa) have reached the end of their 6 year terms. Since they were
elected in 2014 they have been involved in the organization of 3 Loops
Workshops (Loops VII - IX).
It is now time to elect 3 new members of the Steering Committee. We are
soliciting nominations and self-nominations of scientists who are active in
the physics of closed magnetic structures in the solar corona, to serve on
the Coronal Loops Workshops Steering Committee for a 6 year term.
Self-nominations are particularly encouraged to help ensure a diverse pool
of candidates to represent the interests of our community.
Please submit your nominations and self-nominations to Steve Bradshaw
(Steering Committee Chair: <mailto:stephen.bradshaw@rice.edu>
stephen.bradshaw(a)rice.edu) no later than Monday June 8th. The current
members of the Steering Committee will vote per the Bylaws and the
newly-elected members will be duly contacted and announced directly
thereafter.
With best wishes,
Steve Bradshaw
(on behalf of the Coronal Loops Workshops Steering Committee)
Dr. Stephen J. Bradshaw
(Associate Professor of Physics and Astronomy / Chair of the Undergraduate
Program)
Department of Physics and Astronomy (MS 108)
Rice University,
6100 Main Street,
Houston,
TX 77005,
USA.
Tel: +1 713 348 4045
Email: <mailto:stephen.bradshaw@rice.edu> stephen.bradshaw(a)rice.edu
Web: solar.rice.edu
Dear loops friends,
I hope you are well. You might be interested in a new paper just accepted by ApJ: https://arxiv.org/abs/2007.15085.
Stay safe,
Jim
Cross Sections of Coronal Loop Flux Tubes
James A. Klimchuk
NASA Goddard Space Flight Center
Craig E. DeForest
Southwest Research Institute
Abstract
Coronal loops reveal crucial information about the nature of both coronal magnetic fields and coronal heating. The shape of the corresponding flux tube cross section and how it varies with position are especially important properties. They are a direct indication of the expansion of the field and of the cross-field spatial distribution of the heating. We have studied 20 loops using high spatial resolution observations from the first flight of the Hi-C rocket experiment, measuring the intensity and width as a function of position along the loop axis. We find that intensity and width tend to either be uncorrelated or to have a direct dependence, such that they increase or decrease together. This implies that the flux tube cross sections are approximately circular under the assumptions that the tubes have non-negligible twist and that the plasma emissivity is approximately uniform along the magnetic field. The shape need not be a perfect circle and the emissivity need not be uniform within the cross section, but sub-resolution patches of emission must be distributed quasi-uniformly within an envelope that has an aspect ratio of order unity. This raises questions about the suggestion that flux tubes expand with height, but primarily in the line-of-sight direction so that the corresponding (relatively noticeable) loops appear to have roughly uniform width, a long-standing puzzle. It also casts doubt on the idea that most loops correspond to simple warped sheets, although we leave open the possibility of more complex manifold structures.
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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<tel:%28301%29%20286-9060>
Fax: 1-301-286-7194<tel:%28301%29%20286-7194>
E-mail: James.A.Klimchuk(a)nasa.gov<mailto:James.A.Klimchuk@nasa.gov>
Homepage: http://science.gsfc.nasa.gov/sed/bio/james.a.klimchuk<http://science.gsfc.nasa.gov/sed/index.cfm?fuseAction=people.jumpBio&&iPhon…>
No endorsement by NASA is implied for any correspondence related to my official role in professional organizations.
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