<html><head><meta http-equiv="Content-Type" content="text/html charset=utf-8"></head><body style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space;" class=""><div class="">Dear CEDAR colleagues</div><div class=""><br class=""></div><div class="">This note is to invite your participation in our CEDAR Workshop session, "CEDAR science enabled by space weather observational campaigns”. Over the last a few years, we have coordinated a few ground-based observational campaigns to monitor and study upper atmospheric responses to space weather events. These observations were </div><div class="">participated by worldwide incoherent scatter radars as well as FPIs, ionosondes, and GPS networks among many instruments that take data on a regular basis. </div><div class=""><br class=""></div><div class=""><div class="">These campaigns may be classified into two groups: (1) The CME-driven event: March 17-25, 2015 St. Patrick’s Day; (2) The high speed solar wind stream events: March 31-April 4, 2014, September 24-29, 2014, and more recently March 13-18, 2016.</div></div><div class=""><br class=""></div><div class="">The purposes of our session are (1) to promote the CEDAR radar chain science enabled by coordinated multiple-sensor observational efforts; (2) to promote awareness of existing datasets collected for those campaigns that may be used for joint analysis and modeling. </div><div class=""><br class=""></div><div class="">We invite contributions that report, analysis, or model these observations. We are particularly interested in the 2015 and 2016 events mentioned above. Please contact us if you would like to schedule a short talk in our session.</div><div class=""><br class=""></div><div class="">Our session is in WEDNESDAY AFTERNOON (June 22, <span class="" style="font-family: sans-serif; font-size: 13px; background-color: rgb(255, 255, 255);">13:30 - 15:30 CEDAR; Room: </span><font face="sans-serif" size="2" class="">Sweeney B</font>). More information about our session can be found here: <a href="http://cedarweb.vsp.ucar.edu/wiki/index.php/2016_Workshop:CEDAR_campaigns" class="">http://cedarweb.vsp.ucar.edu/wiki/index.php/2016_Workshop:CEDAR_campaigns</a></div><div class=""><br class=""></div><div class=""><br class=""></div><div class="">Conveners: </div><div class="">Shunrong Zhang (MIT Haystack Observatory)</div><div class="">Shasha Zhou (U Michigan)</div></body></html>