IAP, the thermal plasma analyzer on DEMETER

Berthelier, Jean‐Jacques; Godefroy, Michel; Leblanc, Frédéric; Seran, Elena; Peschard, D.; Gilbert, Pierre; Artru, J.

doi:10.1016/j.pss.2005.10.018

Cited by 128 publications

(84 citation statements)

References 41 publications

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“…To study the variations of the ion density, the payload of DEMETER includes the instrument named IAP which gives ion density with a 4-s time resolution. Details of the IAP experiment can be found in Berthelier et al (2006).…”

Section: The Demeter Satellitementioning

confidence: 99%

"Real time analysis" of the ion density measured by the satellite DEMETER in relation with the seismic activity

Parrot

2012

Nat. Hazards Earth Syst. Sci.

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Abstract. This paper is related to the study of the ion density recorded by the low altitude satellite DEMETER. In a first time there is an automatic search for ionospheric perturbations in the complete satellite data set of ion densities. Then perturbations due to known ionospheric phenomena (for example, solar activity) are eliminated as well as perturbations not above a seismic zone. In a second time, there is a search to know if each selected perturbation corresponds to a future earthquake. The earthquakes have been classified depending on their magnitude and depth. This attempt to predict earthquakes of course generates false alarms and wrong detections. The results of this statistical analysis are presented as function of various parameters. It is shown that the number of false alarms is very important, because the ionosphere has variations not only linked to the seismic activity. The number of wrong detections is also important and can be explained by the fact that the satellite is above a seismic area only a few minutes per day and we do not expect continuous perturbations from a given earthquake. The more important results of this study is that the ratio between detected earthquakes and earthquakes to be detected increases with the magnitude of the earthquakes which intuitively makes sense.

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Section: The Demeter Satellitementioning

confidence: 99%

"Real time analysis" of the ion density measured by the satellite DEMETER in relation with the seismic activity

Parrot

2012

Nat. Hazards Earth Syst. Sci.

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“…It is important to note, that mass-spectrometric capabilities of the RPA sensor are significantly improved over earlier experiments on board satellites and rockets (Hanson et al, 1964;Knudsen, 1966;Hanson et al, 1970;Chandra, 1970). A detailed description of the RPA measuring technics relevant to it in situ satellite application on board DMSP and DEMETER is given in (Hanson and Heelis, 1975;Heelis and Hanson, 1998;Berthelier et al, 2006).…”

Section: The Data Setmentioning

confidence: 99%

“…At 730 km the He + can exceed the H + density. Whenever H + and He + densities reach a 5% of total Ni, they can be recognized and retrieved from the analysis procedures ( Hanson and Heelis, 1975;Heelis and Hanson, 1998;Su et al, 2005;Berthelier et al, 2006).…”

Section: The Data Setmentioning

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 variation of the current collected by the analyser versus the grid potential is used to deduce the ion plasma composition, the concentration of each species, the temperature and the velocity component parallel to the analyser axis. A detailed description of the instrument and models used to deduce the plasma parameters can be found in the papers by Séran (2003) and Berthelier et al (2006).…”

Section: Instrumentationmentioning

confidence: 99%

What can we learn from HF signal scattered from a discrete arc?

Seran

Godefroy

Kauristie³

et al. 2009

Ann. Geophys.

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Abstract. We present observations of a discrete southward propagating arc which appeared in the mid-night sector at latitudes equatorward of main substorm activity. The arc observations were made simultaneously by the ALFA (Auroral Light Fine Analysis) optical camera, the SuperDARN-CUTLASS HF radar and the Demeter satellite during a coordinated multi-instrumental campaign conducted at the KEOPS/ESRANGE site in December 2006. The Super-DARN HF signal which is often lost in the regions of strong electron precipitation yields in our case clear backscatter from an isolated arc of weak intensity. Consequently we are able to study arc dynamics, the formation of meso-scale irregularities of the electron density along the arc, compare the arc motion with the convection of surrounding plasma and discuss the contribution of ionospheric ions in the arc erosion and its propagation.

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IAP, the thermal plasma analyzer on DEMETER

Cited by 128 publications

References 41 publications

"Real time analysis" of the ion density measured by the satellite DEMETER in relation with the seismic activity

"Real time analysis" of the ion density measured by the satellite DEMETER in relation with the seismic activity

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

What can we learn from HF signal scattered from a discrete arc?

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IAP, the thermal plasma analyzer on DEMETER

Cited by 128 publications

References 41 publications

&quot;Real time analysis&quot; of the ion density measured by the satellite DEMETER in relation with the seismic activity

&quot;Real time analysis&quot; of the ion density measured by the satellite DEMETER in relation with the seismic activity

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

What can we learn from HF signal scattered from a discrete arc?

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Product

Resources

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"Real time analysis" of the ion density measured by the satellite DEMETER in relation with the seismic activity

"Real time analysis" of the ion density measured by the satellite DEMETER in relation with the seismic activity