<html><body style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space; "><div>Dear Colleagues,</div><div><br class="webkit-block-placeholder"></div><div>I would like to draw your attention to the session G4 at the XXIX URSI General Assembly planned to be held on 7-16 August 2008 in Chicago, USA (<a href="http://www.ece.uic.edu/2008ursiga/">http://www.ece.uic.edu/2008ursiga/</a> ).</div><div>The session is scheduled for the afternoon on 12 August (part a) and 14 August (part b).</div><div>The deadline for submission is 31 January 2008.</div><div><br class="webkit-block-placeholder"></div><div>Sincerely,</div><div><br class="webkit-block-placeholder"></div><div>Gary S. Bust </div><div>Co-convener URSI Commission G4</div><div> </div><div>G4a and b: Assimilation and imaging of the ionosphere and plasmasphere</div><div>G Bust (USA) <a href="mailto:gbust@astraspace.net">gbust@astraspace.net</a> N Jakowski (Germany) <a href="mailto:norbert.jakowski@dlr.de">norbert.jakowski@dlr.de</a> M Codrescu (USA) <a href="mailto:Mihail.Codrescu@noaa.gov">Mihail.Codrescu@noaa.gov</a></div><div>In recent years ionospheric imaging (tomography and other techniques) and assimilative mapping have matured. These techniques are providing new scientific insights and are providing improvements to the operational capability of various systems. Although still largely driven by ground based TEC sensors, there are also opportunities to use and assimilate new ground and space based data types. While this session will welcome a broad range of papers addressing techniques, validation, scientific results and operational benefits, the following topics are especially encouraged: 1) the ingestion of new data sources, 2) the validation and accuracy limitations of imaging and assimilation, 3) new scientific results obtained by use of imaging and assimilation, and 4) the estimation of underlying physical drivers or input drivers from imaging and assimilation.</div><br><div> <span class="Apple-style-span" style="border-collapse: separate; border-spacing: 0px 0px; color: rgb(0, 0, 0); font-family: Helvetica; font-size: 12px; font-style: normal; font-variant: normal; font-weight: normal; letter-spacing: normal; line-height: normal; text-align: auto; -khtml-text-decorations-in-effect: none; text-indent: 0px; -apple-text-size-adjust: auto; text-transform: none; orphans: 2; white-space: normal; widows: 2; word-spacing: 0px; "><br class="Apple-interchange-newline"><span class="Apple-style-span" style="border-collapse: separate; border-spacing: 0px 0px; color: rgb(0, 0, 0); font-family: Helvetica; font-size: 12px; font-style: normal; font-variant: normal; font-weight: normal; letter-spacing: normal; line-height: normal; text-align: auto; -khtml-text-decorations-in-effect: none; text-indent: 0px; -apple-text-size-adjust: auto; text-transform: none; orphans: 2; white-space: normal; widows: 2; word-spacing: 0px; "><div><br class="khtml-block-placeholder"></div><div>---------------------------------------------------------------</div><div>Dr G S Bust, ASTRA, San Antonio Texas</div><div>1-210-877-9150</div><div><a href="mailto:gbust@astraspace.net">gbust@astraspace.net</a></div><div><br class="khtml-block-placeholder"></div><br class="Apple-interchange-newline"></span></span> </div><br></body></html>