****************************************************************************** DORIS Electronic Mail Mon Jan 25 18:45:05 WET 1999 Message Number 0064 ****************************************************************************** Author: Alfred Piuzzi (CNES/SOD) Subject: SPOT and TOPEX manoeuvers + problem in DORIS/TOPEX Dec 13 About SPOT2 satellite There was manoeuvre : october 3rd , 1998 at 6200 seconds and 22 th november at 2500 secondes. About SPOT4 satellite: Manoeuvre on 28th october,1998 at 5700 s and the 14 th december at 5500 s. About TOPEX Manoeuvre decembre 1st , 1998 at 74234 s About DORIS on TOPEX satellite The nominal DORIS receiver failled on december 13 th , 1998, probably due to a SEU problem after more than 6 years of good work. No DORIS data avalaible from 14 to 22 december (Cycle 230) The backup DORIS receiver was put on , the 22th december 1998. The Doris data recorded on 22 december just after oscillator on, are not to be used .Caution ! datation about 50 microseconds bais. Regards Alfred [Mailed From: Pascal Willis ]