Platform Description: ADEOS-II


ADEOS-II satellite
The ADEOS-II platform. Image courtesy of the Japan Aerospace Exploration Agency (JAXA).

Platform Overview

The Advanced Earth Observation Satellite-II (ADEOS-II), also known as Midori-II, was launched on 14 December 2002. It follows the ADEOS mission, which ended June 1997. Design life of ADEOS-II was three to five years, but operations ended on 25 October 2003 because of insufficient electric power. ADEOS-II observes the distribution of chlorophyll, water vapor, sea water, sea surface temperature, and other variables related to the water, energy, and carbon cycles. Data will be used for the Global Energy and Water Cycle Experiment (GEWEX) Plan, the Climate Variation Research Plan (CLIVER) of the World Climate Research Programme (WCRP), and the International Geosphere-Biosphere Program (IGBP).

Platform Characteristics

Main body dimensions: approximately 6 x 4 x 4 m
Solar array paddle dimensions: approximately 3 x 24 m
Mass: 3.68 tons
Power: 5,350 W
Design life: 3-5 years; operations ended prematurely on 25 October 2003.
Launch vehicle: H-IIA rocket
Launch site: Tanegashima Space Center

Platform Sensors

Instrument Developer Spectral Resolution Geophysical parameters
Advanced Microwave Scanning Radiometer (AMSR) Japan Aerospace Exploration Agency (JAXA) 8 bands from 6.9 GHz to 89 GHz Water vapor, precipitation, sea surface wind speed, sea surface temperature, soil moisture, sea ice extent, snow water equivalent
Global Imager (GLI) Japan Aerospace Exploration Agency (JAXA) 23 bands in visible and near-infrared region, 6 bands in short-wave infrared region, and 7 bands in middle- and thermal-infrared region Reflected solar and infrared radiation, ocean color products, chlorophyll, organic substance, vegetation indices, sea surface temperature, snow and sea ice extent, snow grain size, snow impurities, snow surface temperature, aerosol optical thickness over snow surfaces, cloud distribution
Improved Limb Atmospheric Spectrometer-II (ILAS-II) Ministry of the Environment (MOE) 3-13 µm, 753-784 nm Stratospheric profiles of ozone, nitrogen dioxide, nitric acid, aerosols, water vapor, methane, CFC-11, CFC-12, nitrous oxide, and chlorine nitrate in polar regions; atmospheric temperature and pressure
Sea Winds NASA Jet Propulsion Laboratory (JPL) 13.4 GHz Ocean surface wind speed and direction
Polarization and Directionality of the Earth's Reflectances (POLDER) Centre National d'Etudes Spatiales (CNES), France A filter and polarizer wheel rotate and scan eight narrow spectral bands (564, 670, 763, 765, 865, and 910 nm) and three polarization angles (443, 670, and 865 nm). Polarization; directional and spectral characteristics of solar light reflected by aerosols, clouds, oceans, and land surface

Also visit the ADEOS-II Orbital Parameters (JAXA) Web page.

Source or Platform Mission Objectives

The primary science objective of the ADEOS-II mission is to use multiple sensors to study clouds, water vapor, soil moisture, snow runoff, snow and ice, oceanic plant and organic material, and other climatic factors that influence environmental change. Specific objectives are to:

Source or Platform Program Management

The ADEOS-II Mission Operation System (MOS), located at the Earth Observation Center (EOC) in Hatoyama, Japan, is the main planning organization for mission operations. The MOS plans the operation of ADEOS-II onboard instruments based on operation requests from sensor providers, schedules data downlinks, and plans tape-management operations.

Coverage Information

ADEOS-II flies in a sun-synchronous, subrecurrent orbit.

Attitude Characteristics

Data Collection System

The EOC Real-Time Control System coordinates and optimizes conflicts between several satellites, including ADEOS-II, and assigns an available antenna to receive data from each satellite. The MOS receives the antenna information pertinent to ADEOS-II and schedules X-band stations to receive mission data from the satellite.

Communication Links

The MOS serves as a Feeder Link Station for the Data Relay and Tracking Satellite (DRTS) and as a Direct Downlink Station for X-band direct transmission. The Kiruna (Sweden), Wallops (USA), and Alaska (USA) stations also receive mission data from ADEOS-II via X-band transmission, process into Level-0 data (except for POLDER and GLI 250 m), and transmit the Level-0 data to the MOS in Japan. The Showa receiving station in Antarctica receives GLI 250 m data from ADEOS-II via X-band transmission, and delivers data via tape once per year to the MOS.

Data Acquisition and Processing

The MOS processes mission data from ADEOS-II into Level-0 data and sends this to sensor developers via network communication or physical media. AMSR and GLI Level-0 data are processed into Level-1, -2, and -3 products.

Data Access

For access to AMSR data from the ADEOS-II platform, please see the AMSR/ADEOS-II Data Web site.

Latitude Crossing Times

ADEOS-II crosses the equator at 10:30 a.m. local time (± 15 minutes) in a descending node.

List of Acronyms

The following acronyms are used in this document:

ADEOS-II Advanced Earth Observation Satellite-II
AMSR Advanced Microwave Scanning Radiometer
CLIVER Climate Variation Research Plan
CNES Centre National d'Etudes Spatiales
DAAC Distributed Active Archive Center
DRTS Data Relay and Tracking Satellite
EOC Earth Observation Center (Japan)
EORC Earth Observation Research and Application Center (Japan)
GEWEX Global Energy and Water Cycle Experiment
GLI Global Imager
IGBP International Geosphere-Biosphere Program
ILAS-II Improved Limb Atmospheric Spectrometer-II
JAXA Japan Aerospace Exploration Agency
JPL Jet Propulsion Laboratory
MOE Ministry of the Environment
MOS Mission Operation System
POLDER Polarization and Directionality of the Earth's Reflectances
WCRP World Climate Research Programme

References

Earth Observation Research and Application Center (EORC). ADEOS-II Science Project. 2003. http://sharaku.eorc.jaxa.jp/ADEOS2/index.html.
Accessed March 2004.

Japan Aerospace Exploration Agency (JAXA). AMSR Overview. 2003. http://www.eoc.jaxa.jp/satellite/sendata/amsr_e.html. Accessed March 2004.

Japan Aerospace Exploration Agency (JAXA). 2003. ADEOS-II Data Users Handbook. Tokyo, Japan: JAXA. View PDF file.

National Space Development Agency of Japan. Date unknown. ADEOS-II Reference Handbook. View PDF file.