Home - Search - Browse - Alphabetic Index: 0- 1- 2- 3- 4- 5- 6- 7- 8- 9
A- B- C- D- E- F- G- H- I- J- K- L- M- N- O- P- Q- R- S- T- U- V- W- X- Y- Z

---

Demeter

---

Demeter Credit: Manufacturer Image

Status: Operational 2004. First Launch: 2004-06-29. Last Launch: 2004-06-29. Number: 1 . Gross mass: 125 kg (275 lb).

• Demeter - . Mass: 125 kg (275 lb). Nation: France. Agency: CNES. Class: Earth. Type: Seismology satellite. Spacecraft Bus: Myriade. Spacecraft: Demeter. USAF Sat Cat: 28368 . COSPAR: 2004-025C. Apogee: 723 km (449 mi). Perigee: 695 km (431 mi). Inclination: 98.30 deg. Period: 99.00 min.

  Demeter studied disturbances of the ionosphere due to seismo electromagnetic effects and human activities (power lines, VLF transmitters, HF broadcasting stations). Study of natural electromagnetic emissions in the ULF/ELF/VLF range related to seismic or volcanic activity could be used to predict earthquatkes or eruptions in advance. Demeter tracked these emissions and other space plasma parameters (ion composition, electron density and temperature, energetic particles). The scientific payload consisted of three electric and three magnetic sensors (covering six components of the electromagnetic field from DC to 3.5 MHz); a Langmuir probe; an ion spectrometer; and an energetic particle analyzer. 8 Gbits of onboard memory recorded the data, which was returned to earth as 18 Mb/s high bit rate telemetry in the X band. The two-year mission was handled from a control center in Toulouse.