The Demeter microsatellite and ground segment

Cussac, T.; Clair, Marie-Anne; Ultré-Guérard, Pascale; Buisson, F.; Lassalle-Balier, Gérard; Ledu, Michel; Elisabelar, C.; Passot, X.; Rey, Nelly

doi:10.1016/j.pss.2005.10.013

Cited by 122 publications

(84 citation statements)

References 6 publications

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“…The DEMETER (Detection of Electro-Magnetic Emissions Transmitted from Earthquake Regions) satellite was launched on 29 June 2004 (Cussac et al, 2006), with an inclination of 98 • , and an altitude of 770 km (change to 660 km at the end of 2005). The scientific payload on this microsatellite is made of five instruments (Lagoutte et al, 2006): ICE for the Correspondence to: X. Zhang (zhangxm69@yahoo.cn) measurement of the electric field, IMSC for the measurement of the magnetic field, IAP a plasma analyzer, IDP a particle detector, and ISL, a set of two Langmuir probes.…”

Section: Introductionmentioning

confidence: 99%

Analysis of ionospheric plasma perturbations before Wenchuan earthquake

Zhang

Shen

Liu

et al. 2009

Nat. Hazards Earth Syst. Sci.

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Abstract. Based on data recorded by the French DEME-TER satellite, plasma perturbations have been analyzed before the Wenchuan 8.0 earthquake which occurred on 12 May 2008. Using the revisited orbits, the seasonal variations of the O + density at daytime and nighttime were obtained respectively. There mainly exist two kinds of shapes of O + density, with peak values in the Northern Hemisphere during May to September and reversely in the Southern Hemisphere during other months. Analysis on local daytime O + density showed that it reached its lowest values 3 days prior to the earthquake, i.e. on 9 May. With studies in more than 3 month time series and comparison with those in 2006 and 2007, it was found that the significant decrease of the O + density on 9 May 2008 was different from the trend variations of 2007 and 2006 both with relatively higher O + density in May. In addition, the ion density and temperature was also analyzed before the earthquake at local nighttime. They showed smallest value in O + density and fast and short-term variations in ion temperature on 9 May above the epicenter area. All these plasma anomalies may be related to the Wenchuan earthquake. Finally, using our results and those published in other papers, the possible mechanisms of these ionospheric anomalies were discussed.

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Section: Introductionmentioning

confidence: 99%

Analysis of ionospheric plasma perturbations before Wenchuan earthquake

Zhang

Shen

Liu

et al. 2009

Nat. Hazards Earth Syst. Sci.

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“…Thus we confine our study to the fall equinox in 2004 and use the variations in the constituent ion densities to examine the contributions of E × B drifts and neutral winds. (Cussac et al, 2006). Local time of the ascending node is ∼22:30 LT. On board thermal plasma diagnostics include IAP instrument, which provides essentially the same data as the SSIES with 4.32 s time step along the orbit (http://demeter.cnrs-orleans.fr/).…”

Section: Introductionmentioning

confidence: 99%

WN4 effect on longitudinal distribution of different ion species in the topside ionosphere at low latitudes by means of DEMETER, DMSP-F13 and DMSP-F15 data

et al. 2009

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Abstract. Plasma probe data from DMSP-F13, DMSP-F15 and DEMETER satellites were used to examine longitudinal structures in the topside equatorial ionosphere during fall equinox conditions of 2004 year. Since the launch of DEME-TER satellite on 29 June 2004, all these satellites operate close together in the topside ionosphere. Here, data taken from Special Sensor-Ion, Electron and Scintillations (SSIES) instruments on board DMSP-F13, F15 and Instrument Analyser de Plasma (IAP) on DEMETER, are used. Longitudinal variations in the major ions at two altitudes (∼730 km for DEMETER and ∼840 km for DMSP) are studied to further describe the recently observed "wavenumber-four" (WN4) structures in the equatorial topside ionosphere. Different ion species H + , He + and O + have a rather complex longitudinal behavior. It is shown that WN4 is almost a regular feature in O + the density distribution over all local times covered by these satellites. In the evening local time sector, H + ions follow the O + behavior within WN4 structures up to the premidnight hours. Near sunrise H + and later in the daytime, He + longitudinal variations are out of phase with respect to O + ions and effectively reduce the effect of WN4 on total ion density distribution at altitudes 730-840 km. It is shown that both a WN4 E × B drift driver and local F-region winds must be considered to explain the observed ion composition variations.

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“…The Detection of Electro-Magnetic Emissions Transmitted from Earthquake Regions (DEMETER) satellite was launched on June 29, 2004(Cussac et al 2006, declination of 98.23°, and altitude of 710 km (which decreased to 670 km in mid December 2005). The scientific payloads on this microsatellite (Lagoutte et al 2006) consist of: ICE -for the measurement of electric field, IMSC -for the measurement of magnetic field, IAP -a plasma analyzer, IDP -an energetic particle detector, and ISL -a set of two Langmuir probes to detect electron density and temperature.…”

Section: Demeter Satellitementioning

confidence: 99%