Kiyokazu Koga
(JAXA, Japan)

To support future space activities, it is very important to acquire space environmental data related to space radiation degradation of space parts and materials and spacecraft anomalies. Such data are useful for spacecraft design and manned space activity. SEDA-AP was mounted on "Kibo" of ISS (International Space Station) to measure the space environment of the 400 kilometres altitude for 3 years. Neutrons are very harmful radiation because of their strong permeability attributable to its electrical neutrality. The Neutron Monitor measures the energy of neutrons from thermal to 100 MeV in real time using a Bonner Ball Detector and a Scintillation Fiber Detector. The Bonner Ball Detector discriminates neutrons from other charged particles using 3He counters, which have high sensitivity to thermal neutrons. It also measures neutron energy using the relative response, which corresponds to different polyethylene moderator's thickness (6 pcs.). The Scintillation Fiber Detector measures the track of incident particles using a cubic arrangement sensor on which are heaped up 512 scintillation fibers. The sensor discriminates neutrons using differences of these tracks, and measures neutron energy by measuring its track length. This paper reports the development, mission objectives, instrumentation and current status of neutron monitor.

Yugo Kimoto
(JAXA, Japan)

Space Environment Data Acquisition equipment (SEDA), which was mounted on the Exposed Facility (EF) of the Japanese Experiment Module (JEM, also known as "Kibo") on the International Space Station (ISS), was developed to measure space environment and its effect on ISS. One of the concerning of this orbit is an erosion of space materials from atomic oxygen which is abundant component in this attitude. An Atomic Oxygen Monitor (AOM) of SEDA-AP measures the amount of atomic oxygen[1]. The AOM measures the resistance of a thin carbon film that is decreased by atomic oxygen erosion. A function of the AOM was checked on August 2009 and began to measure on September 2009. This paper presents data analysis results from AOM on SEDA-AP.

Osamu Okudaira
(JAXA, Japan)

Light Particle Telescope onboard JASON-2 (J2-LPT) , an ocean observation satellite provided by CNES (France), has been dedicated to monitoring the ambient radiations since 2008. The satellite orbits the earth at an altitude of 1336 km with an inclination of 66 degrees. The data of the radiation environment is useful for evaluating errors of other mission instruments, making alerts to other orbiters, and improving the model of radiation belt. J2-LPT consists of the 4 sensors using Si diodes and a GSO scintillator in order to measure electrons with the enrgy up to 20 MeV and protons up to 250 MeV. J2-LPT is one of JAXA's TEDA (Technical Data Acquisition Equipment) to monitor the space environment, and it has obtained data of radiations at an altitude of 1336 km for the first time in JAXA/TEDA. We will report the result of our observation and the current status of JASON-3 LPT to be launched in 2013.

Satoshi Furuhata
(JAXA, Japan)

TEchnical Data Acquisition equipments (TEDA) on the first Quasi-Zenith Satellite (QZS-1; "MICHIBIKI") was launched by the H-IIA Launch Vehicle No.18 on September 11, 2010 from the Tanegashima Space Center. The TEDA consist of three types of sensors; Light Particle Telescope (LPT, including Alpha particle and Proton Sensor-B (APS-B) and Electron Sensor-A (ELS-A)), Magnetometer (MAM), and Potential Monitor (POM). The TEDA on the QZS-1 have collected these data of space environment from September 21, 2010, these data will help to identify the cause of the satellite anomaly. This paper describes some results and opinions of these observation data on the QZS-1 orbit.