The Space Environment Data Acquisition Equipment - Attached Payload (SEDA-AP) investigation consists of 7 small instruments designed to measure the space environment around the International Space Station (ISS). Located at Equipment Exchange Unit (EER) site 9 on the Japanese Experiment Module - Exposed Facility (JEF), the SEDA-AP instruments includes 5 radiation and particle monitors and 2 electronic device performance monitors. Characterizing and understanding the environment around space vehicles though this unique combination of instruments allows researchers to develop and design more robust, safe and protective spacecraft in the future.Principal Investigator(s)
Japan Aerospace and Exploration Administration, Aerospace Research and Development Directorate (ARD), Tsukuba, , Japan
Japan Aerospace Exploration Agency (JAXA), Tsukuba, , Japan
Japan Aerospace Exploration Agency (JAXA)Sponsoring Organization
Information PendingResearch Benefits
Information PendingISS Expedition Duration:
March 2009 - September 2014Expeditions Assigned
19/20,21/22,23/24,25/26,27/28,29/30,31/32,33/34,35/36,37/38,39/40Previous ISS Missions
The first flight demonstration of a part of neutron monitor was carried out on board STS-89 in 1998, and next, re-flight was done as a part of the HRF(Human Research Facility ) project on board ISS in March, 2001 and the measurement continues by November 2001.
Application of the data is as follows:
(1) Development of various space environmental data base for many utilization needs. Making and maintenance of space environmental model for space craft design. Support for astronauts exposed to space radiation. Support for space weather forecasting. Contributions to scientific fields. Investigation of space radiation degradation of parts & materials and space craft anomalies caused by space environment.
(2) On-orbit verification of the "Kibo" exposed facility utilization technology. On-orbit verification of APBUS technology that utilizes the "Kibo" exposed facility On-orbit verification of experimental payload integration technology that utilizes the "Kibo" exposed facility. An overview, the principle of each instrument and initial observation results are as follows.
Neutron Monitor (NEM) 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.
Heavy Ion Telescope (HIT) Using a Solid State Detector, the Heavy Ion Telescope measures the energy distribution of heavy ions (Li?Fe), which cause single event anomalies and damage to electronic devices. The Solid State Detector converts loss energy of heavy ions in the detector to electrical signals. The HIT measures an incident particle's mass from loss energy in each layer (?E) and the total loss energy of each layer (E) using the ?E×E method.
Plasma Monitor (PLAM) Using a Langmuir probe, Plasma Monitor measures the density and electron temperature of space plasma, which cause charging and discharge of the spacecraft.
Standard Dose Monitor (SDOM) The Solid State Detector and scintillator of the Standard Dose Monitor measure the energy distribution of high-energy light particles such as electrons, protons, and alpha particles, which cause single event anomaly and damage to electronic devices.
Atomic Oxygen Monitor (AOM) The Atomic Oxygen Monitor (AOM) measures the amount of atomic oxygen on the orbit of the International Space Station. Atomic oxygen interacts with the thermal control materials and paints, thereby degrading their thermal control ability. The AOM measures the resistance of a thin carbon film that is decreased by atomic oxygen erosion.
Electronic Device Evaluation Equipment (EDEE) The Electronic Device Evaluation Equipment measures single-event phenomena and radiation damage to electronic parts. Single-event phenomena are induced by the impact of an energetic heavy ion or proton. The occurrence of single-event phenomena is detected by bit flips of memorized data, the sudden increase of power supply current, etc.
Micro-Particle Capturer (MPAC) and Space Environment Exposure Device (SEED)
The Micro-Particle Capturer is a device used to capture micro-particles that exist on orbit. Silica-aerogel and gold plates are used to capture micro-particles. After the retrieval of MPAC, the size, composition, and collision energy, etc. of captured particles are evaluated.
The Space Environment Exposure Device is a device used to expose materials for space use. After SEED retrieval, degradation of these materials caused by the space environment, such as high energy radiation, atomic oxygen and UV, will be evaluated.
Support for astronauts exposed to space radiation. Investigation of space radiation degradation of parts & materials and space craft anomalies caused by space environment.Earth Applications
Support for space weather forecasting. Contributions to scientific fields. Space environment data, which is measured by SEDA-AP, is distributed by Space Environment & Effect System (SEES; http//sees.tksc.jaxa.jp) and will be used widely by academic and industrial users in laboratories, universities, and JEM experiment investigators, etc. in spacecraft operation, engineering field and scientific research.
SEDA-AP was launched by Flight 2J/A fixed to ELM-ES. The location of SEDA-AP on ISS/JEM Exposed Facility is EFU#9. MPAC&SEED was removed from SEDA-AP by EVA and return to the Ground.Operational Protocols
On-orbit environment measurement at the mast extended condition for three years. After three years operation, SEDA-AP will be disposed by HTV except MPAC&SEED. MPAC&SEED was removed from SEDA-AP by EVA and return to the Ground.
Development of the Flight Model (FM) of SEDA-AP has been completed and was lanced on July 16 in 2009. SEDA-AP was attached to Exposed Facility (EF) of ?Kibo? on July 25 using the robot arm of ?Kibo?. Initial checkout was started on August 4 and successfully ended on September 17. SEDA-AP keeps succesfully observing the space environment around ISS. MPAC&SEED was moved ISS inboard by EVA for the STS-131 mission period, which is a flight that astronaut Yamazaki boarded. MPAC&SEED sample returned to the ground by this flight. MPAC&SEED was sent out to Japan after it checked simply in KSC, and arrived at the Tsukuba space center on May 26, 2010. The data of it is being analyzed now.The valuable data of 400 km not obtained in a usual satellite is accumulated, and it will contribute to the space environment modeling in the future. Moreover, it is scheduled that the influence on the space environment around ISS is clarified by various data analysis at the solar flare, and manned pace activity is supported.
Koga K, Goka T, Matsumoto H, Obara T, Muraki Y, Yamamoto T. Measurement of high-energy neutrons at ISS by SEDA-AP. Astrophysics and Space Science Transactions. 2011; 7: 411-416. DOI: 10.5194/astra-7-411-2011.
Obara T, Matsumoto H, Koga K. Space environment measurements by JAXA satellites and ISS/JEM. Acta Astronautica. 2012; 71: 1-10. DOI: 10.1016/j.actaastro.2011.08.009.
Obara T. Space environment data acquisition with Kibo exposed facility on the International Space Station (ISS). Electronics and Communications in Japan. 2012; 95(9): 10-16. DOI: 10.1002/ecj.11418.
Obara T, Koga K, Kimoto Y, Matsumoto H, Sasaki , Noriko Y, Muraki S, Doke , Goka T. Space Environment Data Acquisition with the Kibo Exposed Facility on the International Space Station (ISS). Data Science Journal. 2010 03/04/2010; 8: IGY76-IGY84. DOI: 10.2481/dsj.SS_IGY-007.