From: Joseph Lazio MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit Date: Mon, 12 May 2003 16:01:42 -0400 (EDT) To: roger.hess@gsfc.nasa.gov Subject: SIRA Workshop X-Mailer: VM 6.43 under 20.4 "Emerald" XEmacs Lucid Message-ID: <16063.64046.182240.159409@exeter.nrl.navy.mil> Reply-To: Joseph.Lazio@nrl.navy.mil X-URL: http://rsd-www.nrl.navy.mil/7213/lazio/ X-Attribution: TJWL Hello, In the hopes that late is better than never: Interstellar Scattering at Low Frequencies Joseph Lazio (NRL) Radio wave propagation through the ionized interstellar medium produces a rich set of observables by virtue of the presence of density fluctuations. I describe a number of these observables and illustrate their magnitudes, using the recent NE2001 model to make predictions (Cordes & Lazio 2002). In general, the SIRA sky should be quiescent as scintillations will be either quenched or so long as to be unimportant and pulsar pulse broadening will reach extreme values. The expected large magnitudes of scattering phenomena opens the possibility of anomalous scattering, though. I also describe the current understanding about the process responsible for generating the density fluctuations and SIRA's capability for constraining the shape of the power spectrum of density fluctuations, particularly regarding the existence of an inner scale. -- T. Joseph W. Lazio, Ph.D. voice: +1 202 404 6329 Remote Sensing Division fax: +1 202 404 8894 Naval Research Lab, Code 7213 Joseph.Lazio@nrl.navy.mil Washington, DC 20375-5351 USA http://rsd-www.nrl.navy.mil/7213/lazio/