1. Operation Status of MAXI and ISS M.Kohama,H.Tomida,S.Ueno,Y.Adachi,H.Itamoto,M.Ishikawa,K.Kawasaki(JAXA), T.Mihara,M.Sugizaki,M.Serino,M.Matsuoka(RIKEN),H. Negoro(Nihon univ.) and MAXI Team In July 2009, MAXI and ”Kibo” Exposed Facility were delivered to International Space Station(ISS) by Space Shuttle Endeavour and were completed by the operation of Koichi Wakata and ISS Crew. MAXI was powered on in August/03/2009, and MAXI observation has been started from August/17/2009. We report the recent one year operation status of the MAXI and ISS. The operation of MAXI did not so go well easily. It suffered from some troubles of communications. ”Kibo” Operation team and MAXI Operation team have improved some onboard telecommunication system and the ground equipments to store MAXI data more completely. Now, MAXI observation data are almost completely delivered to our analysis system. MAXI and ISS 2m 520kg SSC (Solid-state Slit Camera)  32 CCD (Hamaphotonics)  200 cm 2. 0.5-12keV 。  -60 ℃ with LHPRS  Energy resolution: 150 eV @5.9keV GSC (Gas Slit Camera)  12 proportional counters  Total area:5350cm 2  Energy:2-30keV  10μ ｍ dia. Carbon wire for anode ISS motion International Space Station(ISS) Japan Experiment Module “kibo” MAXI ISS orbit (November 25,2010) Inclination 51.65 deg Perigee Height 346 km Apogee Height 357 km Revolution per Day 15.73 Data Communication STS127 07/16 Launch 07/21 attached operation by Koichi Wakata and ISS Crew MAXI activation 08/03 MAXI power on 08/17 GSC and SSC operation start 08/18 GSC first Image MAXI Ethernet trouble was occurred. Whenever the trouble of the Ethernet communication, we had to reboot the MAXI system. We experienced rebooting 17 times by March, 2010. 2009/07 2009/08 2009/092009/102009/112009/12 2010/01 2010/022010/03 2010/042010/05 2010/06 2010/07 2010/08 2010/09 2010/102010/11 MAXI Checkout phase Daily data distribution was begun from 2010/12/15. Ethernet communication trouble were some times occurred. New Ethernet adaptor for MAXI was attached by ISS crew. Then, MAXI Ethernet trouble was repaired. Now, MAXI observation data are almost completely delivered. MAXI output the data to 2 logical data channels. IEEE-B1553 (LOW Rate Data Line 25kbps) Ethernet (Medium Rate Data Line ~600kbps) ISS Pressured space HUBHUB NASA line router JAXA line router B1553 controller NASA line Antenna system /Storage JAXA line Antenna system /Storage JEM Communication processor LOW Rate Data Medium Rate Data (backup line) JAXAJAXA NASA GND system ~70% real time contact/24h 1hr real time contact/24h New Ethernet adaptor for MAXI Operation So as not to give the obstacle to the ISS crew activity, the commanding to the ISS equipment from ground system is planned very severely. In MAXI, the file transfer for the observation plan and the commanding for updating this file every day are put in the ISS operation plan, and it is executed every day. ISS Operation plan viewer All of ISS activity (including commanding to MAXI system) has been planned before two weeks. MAXI Data acquisition rate New Ethernet adaptor for MAXI It is consist of PC104 computer unit. The Low Rate Data Line keeps stabilizing very much since the beginning of mission. Resent data losses are due to the maintenance of the ground equipment. These can be collected later. On the other hand, after the installation of new Ethernet adaptor, the Medium Rate Data Line is very stabilized though it was very unstable at first. 11/26 Press release GSC all sky image 2009/12/15 Daily data distribution start Crab LC 2010/11/03 spectrum of bright sources Crab Mission life > 2year 2 month integrated Image One orbit Image 10cm RIK EN Novae alert