EOS AM
Renamed Terra
Terra simultaneously will study clouds, water vapor, small particles in the
atmosphere called "aerosol" particles, trace gases, land surface and oceanic
properties, as well as the interaction between them and their effect on the
Earth's energy budget and climate. Moreover, Terra will observe changes in the
Earth's radiation energy budget, together with measurements of changes in
land/ocean surface and interactions with the atmosphere through exchanges of
energy, carbon and water.
Worth $1.3 billion
Right after launch the high-gain antenna had problems tracking the TDRS
satellites. A few days later the main computer shut down. Both problems seem
linked and new software is expected to fix them. On 26 Oct 2000 the satellite
stopped providing high-rate data because an onboard monitor switched the
service off. It could be resumed the next day.
http://terra.nasa.gov/
http://modis.gsfc.nasa.gov/
http://eos-am.gsfc.nasa.gov/
http://lmms.external.lmco.com/photos/civil_space/earth_observation_sat_eos/eos.html
sat-index articles
Prime
contractor
|
Lockheed
Martin
|
Platform
|
|
Mass
at launch
|
4854
or 4725 kg
|
Mass
in orbit
|
|
Paylaod
mass
|
1100
kg
|
Dimension
|
|
Solar
array
|
|
Stabilization
|
3-axis
|
DC
power
|
7500
W
|
Design
lifetime
|
6
years
|
The 45 m² solar array will use 36,480 advanced gallium arsenide germanium
(GaAs/Ge) and weigh 73 kg
MODIS (Moderate-resolution Imaging Spectroradiometer) collects the most
detailed sea surface temperatures measurements.
Operates at 2, 13 and 15 GHz
Acquisition via
TDRS
Telemetry: 2287.5 MHz
Command: 2106.4 MHz
Data: 15003.4 MHz (upto 150 Mbps)
ASTER provides high-resolution images of the land surface, water, ice,
and clouds using three separate sensor subsystems covering 14 multi-spectral
bands from visible to thermal infrared. The significant resolution scales are
15m, 30m, and 90m in the visible, short-wave IR, and thermal fR, respectively.
CERES measures Earth's radiation budget and atmospheric radiation from
the top of the atmosphere using a broadband scanning radiometer with bolometers
detectors.
MODIS measures biological and physical processes on land and the ocean
using a cross-track scanning multi-spectral radiometer with 36 spectral bands
from visible to thermal infrared. Detector cooling is through a passive radiant
cooler, and filters are interference type.
MISR measures top-of-atmosphere, cloud and surface angular reflectance
functions, and measures surface BRDF, aerosol, and vegetation properties using
four spectral bands in each of nine pushbroom imaging cameras oriented at
different angles along-track. The detectors are CCDS, the filters are
interference qw.
MOPITT measures carbon monoxide and methane in the troposphere using
correlation spectroscopy with pressure modulated and length modulated gas
cells. Detectors are cooled using a Stirling Cycle mechanical cooler.