GEOTAIL Energetic Particles and Ion Composition Instrument.

Williams, D. J.; McEntire, R. W.; Schlemm, C. E.; Liu, A. T. Y.; Gloeckler, G.; Christon, S. P.; Gliem, F.

doi:10.5636/jgg.46.39

Cited by 163 publications

(114 citation statements)

References 7 publications

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“…For the diagrams in Plate 1, Geotail data are parceled into 96-s samples and distributed along the trajectory according to plasma regime at this temporal resolution into 1 RE by 1 RE bins. (The 96-s temporal resolution is the "science record" length of the energetic particle and ion composition (EPIC) instrument [Williams et al, 1994], and it is for facilitating and enhancing analysis of the Geotail energetic particle data that this plasma regime identification has been performed.) Because of the limited sampling time, the highly stochastic nature of the magnetotail, and the variable occurrence frequency of the plasma regimes at any specific location, neighboring probabilities can be quite different.…”

Section: Data Set Of Plasma Regime Identificationsmentioning

confidence: 99%

Magnetospheric plasma regimes identified using Geotail measurements: 2. Statistics, spatial distribution, and geomagnetic dependence

Christon¹,

Eastman²,

Doke³

et al. 1998

J. Geophys. Res.

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Abstract. We investigate the spatial distribution, solar-terrestrial correlation, and basic statistics of a long sequence of plasma regime identifications through the probability of observation P at downtail distances of-30 < Xagsm < 210 RE, in an aberrated GSM coordinate system. The data are from Geotail spacecraft measurements obtained from October 1992 through October 1994. Earth's local plasma environment has been classified into five principal plasma regimes: PS, the plasma sheet, LB, the lobe (vacuum lobe, with only trace plasma content), and BL, the magnetospheric boundary layer, which together comprise the magnetosphere proper, and MS, the magnetosheath, and SW, the nearby solar wind. Eastman et al.

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Section: Data Set Of Plasma Regime Identificationsmentioning

confidence: 99%

Magnetospheric plasma regimes identified using Geotail measurements: 2. Statistics, spatial distribution, and geomagnetic dependence

Christon¹,

Eastman²,

Doke³

et al. 1998

J. Geophys. Res.

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“…The intervals are 16:00±19:30 UT on 14 March (day 73) 1993, and 08:28±08:43 and 14:25±14:45 UT on 18 April (day 108) 1994. We used data from the magnetic-®eld (MGF) experiment (Kokubun et al, 1994) at 3-s resolution and the energetic particle (EPIC) instrument (Williams et al, 1994). EPIC consists of sensors ICS and STICS, and the time resolution is declared in each plot varying from 3 to 96 s. All the EPIC measurements are depicted as di erential¯uxes.…”

Section: Observations and Data Analysismentioning

confidence: 99%

Spatial structure of the plasma sheet boundary layer at distances greater than 180 R<sub>E</sub> as derived from energetic particle measurements on GEOTAIL

et al. 1997

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Abstract. We have analyzed the onsets of energetic particle bursts detected by the ICS and STICS sensors of the EPIC instrument on board the GEOTAIL spacecraft in the deep magnetotail (i.e., at distances greater than 180 R E ). Such bursts are commonly observed at the plasma-sheet boundary layer (PSBL) and are highly collimated along the magnetic ®eld. The bursts display a normal velocity dispersion (i.e., the higher-speed particles are seen ®rst, while the progressively lower speed particles are seen later) when observed upon entry of the spacecraft from the magnetotail lobes into the plasma sheet. Upon exit from the plasma sheet a reverse velocity dispersion is observed (i.e., lower-speed particles disappear ®rst and higher-speed particles disappear last). Three major ®ndings are as follows. First, the tailwardjetting energetic particle populations of the distant-tail plasma sheet display an energy layering: the energetic electrons stream along open PSBL ®eld lines with peak uxes at the lobes. Energetic protons occupy the next layer, and as the spacecraft moves towards the neutral sheet progressively decreasing energies are encountered systematically. These plasma-sheet layers display spatial symmetry, with the plane of symmetry the neutral sheet. Second, if we consider the same energy level of energetic particles, then the H + layer is con®ned within that of the energetic electron, the He ++ layer is con®ned within that of the proton, and the oxygen layer is con®ned within the alpha particle layer. Third, whenever the energetic electrons show higher¯uxes inside the plasma sheet as compared to those at the boundary layer, their angular distribution is isotropic irrespective of the Earthward or tailward character of¯uxes, suggesting a closed ®eld line topology.

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“…The locations of these stations are listed in Table 1 Figure 2 shows the Geotail magnetic field (MGF) [Kokubun et al, 1994a] and energetic particle (EPIC) data [Williams et al, 1994] during the interval of 1300 to 1600 UT. Figure 2a plots the Figure la shows the locations of the Geotail, GOES 6, and GSM z magnetic field component and the total field strength.…”

mentioning

confidence: 99%

Coordinated ISTP satellite and ground observations of morningside Pc5 waves

Ohtani¹,

Rostoker²,

Takahashi³

et al. 1999

J. Geophys. Res.

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Abstract. This paper reports the result of a coordinated data analysis of a morningside Pc5 event observed at different altitudes in the magnetosphere and also on the ground. The event took place during 1400-1500 UT of April 29, 1993. The Geotail satellite was located in the boundary region and observed a 5-min quasi-periodic magnetic oscillation. The oscillation was mostly transverse to the background magnetic field. A 90 ø phase lag between the magnetic field and electric field variations was not clear, suggesting that the oscillation was not a standing wave and that Geotail was located in or close to the excitation region. The plasma flow vector rotated clockwise on the equatorial plane viewed from the north as expected for a magnetospheric surface wave on the morningside. At geosynchronous altitude, the GOES satellites also observed a 5-min magnetic oscillation but with a significantly smaller amplitude than at the Geotail position. Five-minute magnetic oscillations were also detected at Canadian Auroral Network for the OPEN Program Unified Study (CANOPUS) and Magnetometer Array for Cusp and Cleft Studies (MACCS) ground stations in the same local time sector as the satellites, even equatorward of a region 2 field-aligned current observed by the Freja magnetometer data. From the phase analysis of ground signatures, the wave is inferred to propagate westward (antisunward) at a velocity of 18 ø in longitude per minute. The propagation speed mapped to the equator, 400 km/s, is in the range of the expected flow speed of the magnetosheath. It is inferred that in the present event, the Kelvin-Helmholtz instability at the magnetopause, rather than at the inner edge of the boundary layer, excited an oscillation at the single frequency in a large area from the boundary region to deep inside the magnetosphere.

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GEOTAIL Energetic Particles and Ion Composition Instrument.

Cited by 163 publications

References 7 publications

Magnetospheric plasma regimes identified using Geotail measurements: 2. Statistics, spatial distribution, and geomagnetic dependence

Magnetospheric plasma regimes identified using Geotail measurements: 2. Statistics, spatial distribution, and geomagnetic dependence

Spatial structure of the plasma sheet boundary layer at distances greater than 180 R<sub>E</sub> as derived from energetic particle measurements on GEOTAIL

Coordinated ISTP satellite and ground observations of morningside Pc5 waves

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GEOTAIL Energetic Particles and Ion Composition Instrument.

Cited by 163 publications

References 7 publications

Magnetospheric plasma regimes identified using Geotail measurements: 2. Statistics, spatial distribution, and geomagnetic dependence

Magnetospheric plasma regimes identified using Geotail measurements: 2. Statistics, spatial distribution, and geomagnetic dependence

Spatial structure of the plasma sheet boundary layer at distances greater than 180 R&lt;sub&gt;E&lt;/sub&gt; as derived from energetic particle measurements on GEOTAIL

Coordinated ISTP satellite and ground observations of morningside Pc5 waves

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Spatial structure of the plasma sheet boundary layer at distances greater than 180 R<sub>E</sub> as derived from energetic particle measurements on GEOTAIL