NASA - National Aeronautics and Space Administration

Overview | Description | Applications | Operations | Results | Publications | Images

Experiment/Payload Overview

Information provided courtesy of the Japan Aerospace and Exploration Agency (JAXA).
Brief Summary

Space Environment Data Acquisition Equipment - Attached Payload (SEDA-AP) will measure space environment data at the Exposed Facility of Japanese Experimental Module ?Kibo? on the International Space Station (ISS). SEDA-AP is composed of common bus equipments that supports launch, RMS handling, power/communication interface with JEM-EF, an extendible mast that extends the neutron monitor sensor into space (1m), and equipments that measure space environment data. SEDA-AP has seven measurement units as follows, (1) Neutron Monitor (NM),(2) Heavy Ion Telescope (HIT),(3) Plasma Monitor (PLAM),(4) Standard Dose Monitor (SDOM),(5) Atomic Oxygen monitor (AOM),(6) Electronic Device Evaluation Equipment (EDEE),(7) Micro-Particles Capture (MPAC) and Space Environment Exposure Device (SEED).

Principal Investigator

Kiyokazu Koga, , Japan Aerospace Exploration Agency, , , Japan

Co-Investigator(s)/Collaborator(s)

Information Pending

Payload Developer

Japan Aerospace and Exploration Administration, Aerospace Research and Development Directorate (ARD), Tsukuba, , Japan
Japan Aerospace Exploration Agency, Tsukuba, , Japan

Sponsoring Space Agency

Japan Aerospace Exploration Agency (JAXA)

Sponsoring Organization:

Information Pending

ISS Expedition Duration:

March 2009 - October 2013

Expeditions Assigned

19/20, 21/22, 23/24, 25/26, 27/28, 29/30, 31/32, 33/34, 35/36

Previous 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.

^ back to top

---

Experiment/Payload Description

Research Summary

• The International Space Station (ISS) is in orbit around the Earth at an altitude of approximately 400km. Space around the station is a high-vacuum environment where the atmospheric density is one hundred millionth of that on the Earth's surface. Furthermore, the area is exposed to a barrage of radiation particles from the Sun and the galaxy. Radiation particles are made of high-energy particles that can inflict damage to surfaces on satellites and space stations, cause transmission failure and adversely affect the health of astronauts. Human activities have extended beyond our planet into outer space. As typified by satellite broadcasts and communications as well as car navigation systems, space has become an inseparable part of our lives. However, we must acquire a fuller understanding of space environments in order to utilize and operate in space safely. That is why SEDA-AP will be mounted on Japan's experiment module, Kibo, at ISS to take continuous measurements of on the 400-km altitude space environment along the space station's trajectory for a period of around 3 years.



• 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. 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.



• Spacecraft and devices that are durable to cosmic environments are critical in ensuring safe usage of space. The space environment data obtained by SEDA-AP will be used as a basis for designing spacecraft and their fixtures and developing materials. If changes in space environment can be predicted, space hazards such as equipment malfunction and risks of astronaut radiation exposure can be reduced or prevented by adjusting the orbit. Space weather forecasts, for predicting changes in space environment by monitoring the Sun's activities and magnetic fields around-the-clock, have already been started. It is hoped that SEDA-AP data will contribute to spacecraft operations, space weather forecasts and research in the fields of space and earth science.

Description

(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.

^ back to top

---

Applications

Space Applications

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.

^ back to top

---

Operations

Operational Requirements

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.

^ back to top

---

Results/More Information

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.

^ back to top

---

Related Web Sites

Space Environment Data Acquisition - Attached Payload

^ back to top

---

Publications

^ back to top

---

Ground Based Results Publications

^ back to top

---

ISS Patent Publications

^ back to top

---

Related Publications

^ back to top

---

Images

SEDA-AP onboard configulation;(NEM-S is extended 1 m from the SEDA-AP structure). Image courtesy of JAXA.

+ View Larger Image


NASA Image: S127E008244 - Close-up view of Kibo arm moving Space Environment Data Acquisition Attached Payload (SEDA-AP). Solar arrays are visible in the background.

+ View Larger Image