Sender: aschwand@socrates.lmsal.com Message-ID: <3EB2DC38.3096F22B@lmsal.com> Date: Fri, 02 May 2003 13:59:36 -0700 From: "Markus J. Aschwanden" X-Mailer: Mozilla 4.8C-SGI [en] (X11; U; IRIX64 6.5 IP35) X-Accept-Language: en MIME-Version: 1.0 To: "N. Gopalswamy" , roger.hess@gsfc.nasa.gov Subject: SIRA abstract References: <200305021942.h42JgvB02023@fugee.gsfc.nasa.gov> Content-Type: multipart/alternative; boundary="------------DB284E5EBF8D75743BB02EA1" --------------DB284E5EBF8D75743BB02EA1 Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit Interplanetary Electron Beams: SIRA Imaging and Science Prospects ================================================== (Markus J. Aschwanden, LMSAL) SIRA will be able to image radio emission from 2 solar radii to 1 AU, and moreover will be able to triangulate 3D positions of source centroids and do provide some crude 3D reconstruction of interplanetary radio sources. Some science problems that can be approached with SIRA are: (1) mapping of the Archimedean spiral along which interplanetary electron beams propagate. (2) mapping of the acceleration sites of electron beams and determine whether their origin is in coronal reconnection sites of in interplanetary shock fronts, e.g. associated with CMEs (3) stereoscopic reconstruction of the directivity of type III emission which provides basic information on emission angles with most favorable wave growth, and this way allows to discriminate competing theoretical models of the emission mechanism (e.g., bump-in-tail instability, two-stream instability). (4) study evolution of nonthermal distributions, such as relaxation, plateau formation, and beam formation. All in all, SIRA will contribute to fundamental plasma physics theory as well as to more practical applications such as forecasting (or now-casting) of solar energetic particles after flares before CMEs arrive at Earth. -- ------------------------------------------------------------------------ Dr. Markus J. Aschwanden Lockheed Martin, Advanced Technology Center Solar & Astrophysics Lab, Dept. L9-41, Bldg.252 3251 Hanover Street, Palo Alto, CA 94304, USA Phone: 650-424-4001 FAX: 650-424-3994 WWW: http://www.lmsal.com/~aschwand/ ------------------------------------------------------------------------ --------------DB284E5EBF8D75743BB02EA1 Content-Type: text/html; charset=us-ascii Content-Transfer-Encoding: 7bit  
Interplanetary Electron Beams: SIRA Imaging and Science Prospects
==================================================
(Markus J. Aschwanden, LMSAL)

SIRA will be able to image radio emission from 2 solar radii to 1 AU,
and moreover will be able to triangulate 3D positions of source centroids
and do provide some crude 3D reconstruction of interplanetary radio sources.
Some science problems that can be approached with SIRA are:
(1) mapping of the Archimedean spiral along which interplanetary
     electron beams propagate.
(2) mapping of the acceleration sites of electron beams and determine
     whether their origin is in coronal reconnection sites of in interplanetary
     shock fronts, e.g. associated with CMEs
(3) stereoscopic reconstruction of the directivity of type III emission which
     provides basic information on emission angles with most favorable wave
     growth, and this way allows to discriminate competing theoretical models
     of the emission mechanism (e.g., bump-in-tail instability, two-stream instability).
(4) study evolution of nonthermal distributions, such as relaxation, plateau formation,
     and beam formation.
All in all, SIRA will contribute to fundamental plasma physics theory as well as
to more practical applications such as forecasting (or now-casting) of solar energetic
particles after flares before CMEs arrive at Earth.
  

-- 
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Dr. Markus J. Aschwanden 
Lockheed Martin, Advanced Technology Center
Solar & Astrophysics Lab, Dept. L9-41, Bldg.252
3251 Hanover Street, Palo Alto, CA 94304, USA
Phone: 650-424-4001     FAX: 650-424-3994
WWW: http://www.lmsal.com/~aschwand/
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