Message-Id: <200305171436.h4HEafB24495@fugee.gsfc.nasa.gov> Date: Sat, 17 May 2003 10:36:41 -0400 (EDT) From: "N. Gopalswamy" Reply-To: "N. Gopalswamy" Subject: Kassim Abstracts - Poster and Talk To: roger.hess@gsfc.nasa.gov MIME-Version: 1.0 Content-Type: TEXT/plain; charset=us-ascii Content-MD5: o6WEQkCqF4+tWbvL5sFQHQ== X-Mailer: dtmail 1.3.0 @(#)CDE Version 1.4.6_06 SunOS 5.8 sun4u sparc Roger: Pl link these two abstracts to the program page. You may be getting more so we can ultimately collect all the talks and abstracts. Gopal ------------- Begin Forwarded Message ------------- From: "Namir E. Kassim" To: , Cc: "Kassim, Namir" Subject: Kassim Abstracts - Poster and Talk Date: Mon, 12 May 2003 11:57:55 -0400 MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Priority: 3 (Normal) X-MSMail-Priority: Normal Importance: Normal X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2800.1165 Bob, Gopal - LOFAR Poster Abstract: THE LOW FREQUENCY ARRAY (LOFAR): OPENING A NEW WINDOW ON THE UNIVERSE N.E. Kassim, T.J.W. Lazio, P.C. Crane, B. Hicks, K. Stewart, C. Gross Remote Sensing Division, Naval Research Laboratory Namir.Kassim@nrl.navy.mil Application of self-calibration techniques to low-frequency radio interferometric data has enabled high-resolution, high sensitivity imaging at long wavelengths for the first time. We illustrate these advances using Very Large Array (VLA) 74 MHz images having sub-arcminute resolution and sub-Jansky sensitivity. The VLA 74 MHz breakthrough has inspired the Low Frequency Array (LOFAR), a completely electronic array planned to operate in the 10-240 MHz frequency range (http://www.lofar.org). It will have a square kilometer of collecting area at 15 MHz, milliJansky sensitivity, and arcsecond resolution. LOFAR will surpass, by 2-3 orders of magnitude, the power of previous interferometers in its frequency range, and thus open a new window on the electromagnetic spectrum. We describe LOFAR and present recent results from its design-and-development phase. LOFAR's scientific objectives include (1) Planetary and solar radio emission; (2) Acceleration, Turbulence, and Propagation in the interstellar medium including 3D mapping of the Galactic cosmic rays; and (3) The extragalactic universe, including high-redshift radio galaxies, galaxy clusters, and possibly the first structures to form near the epoch of reionization. LOFAR may also serve as the receiving instrument for imaging bi-static solar radar experiments. Because LOFAR will open a new window on the spectrum, discovering new classes of sources or physical phenomena is also likely. LOFAR is an international project being developed by the Naval Research Laboratory (US), ASTRON (NL), and MIT (US). Basic research in radio astronomy at the Naval Research Laboratory is supported by the Office of Naval Research. Abstract of Namir's SIRA talk: Low Frequency Observations of Supernova Remnants and HII Regions Namir Kassim Naval Research Laboratory Code 7213 Washington, DC 20375 Namir.Kassim@nrl.navy.mil I will discuss Galactic observations of SNRs and HII regions applicable to both SIRA and LOFAR. The two instruments will be quite complimentary, as their combined frequency agility will probe a wide range of SNR and HII physical parameter phase space. Observations of SNRs are important for understanding the energetics of the ISM, SNe physics, and particle acceleration processes. Observations of ionized gas, both discrete and distributed HII, will be important for probing the spectrum and distribution of cosmic rays in the galaxy, as well as the distribution and properties of the ionized gas itself. At the lowest frequencies, SIRA should be exceptionally well matched to investigate the properties of the Warm Ionized Medium which is spread throughout the volume of the Galaxy. ------------- End Forwarded Message ------------- Nat Gopalswamy Code 695.0 Bldg 21, Room 260 NASA/GSFC Greenbelt MD 20771-0001 ph: 1-301-286-5885 fax: 1-301-286-1683