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Saci 1


Designation 25941 / 99057B
Launch date 14 Oct 1999
Country of origin Brasil
Mission Scientific: magnetosphere study
Perigee/Apogee 750 km sun-synchronous
Launch vehicle Long March #56

Contact lost after one week
worth $4.6 million

External resources

sat-index articles

Technical data


Prime contractor INPE
Mass at launch 60 kg
Payload mass 28 kg
Dimension 65 x 40 x 40 cm
Solar array  
Stabilization spin stabilized
DC power > 30 W (eclipse: 2 x 22 NiCd battery cells providing 4.5 Ah)
Design lifetime 18 months

S-band downlink (256 kbps, 2025-2120 MHz) & uplink (19.2 kbps, 2200-2300 MHz). 2 W RF power


Plasmex: study of plasma bubbles and geomagnetic experiments
The main objective of this experiment in the ionosphere is to investigate the generation, development and decay of the plasma bubbles, particularly in the Brazilian region. This investigation intends to elucidate the strong influence of the bubbles and associated plasma turbulence in several space application systems (remote sensing with radar, space geodesy, trans-ionosphere telecommunication etc). The discovery of such phenomenon in the Brazilian ionosphere was reported by measurements with rocket-borne photometers and ground-based ionosond.

Fotsat: airglow photometer
This experiment has the objective of measuring the intensity of the terrestrial airglow emissions in global ranges of Oxygen OI 557.7nm, OI 630.0nm and OH(8,3) in global ranges. Special interests in this investigation are the equatorial ionosphere anomaly, the South-Atlantic anomaly, and the longitudinal and latitudinal variations of the dynamical process in the ionosphere. The photometer was designed and manufactured by INPE.

Orcas: solar and anomalous cosmic rays observation in the magnetosphere
The main objective of the telescope ORCAS is to measure the Anomalous Cosmic Rays (ACR) fluxes, from C to Ne, "trapped" into the belt by using solid detectors and by identifying the time and the direction of particle arrivals. The ORCAS will allow studies of the space distribution and of the dynamics associated to the population of the trapped particles in conditions of minimum solar activity with intense fluxes.

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