The AMPTE CCE Spacecraft

Dassoulas, John; Margolies, Donald L.; Peterson, Max R.

doi:10.1109/tgrs.1985.289512

Cited by 17 publications

(5 citation statements)

References 1 publication

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“…Cohen et al (2017) contended that if one assumed the high energy oxygen was actually O 6+ instead of O + , the power law spectrum in intensity would be well ordered by E/q . This power law spectrum would align with previous high energy plasma sheet observations of solar wind ions reported by Gloeckler and Hamilton (1987) using the CHEM and SULEICA instruments, which could differentiate charge state, on AMPTE/CCE (see Dassoulas et al, 1985; Gloeckler et al, 1985) and on AMPTE/IRM (see Häusler et al, 1985; Möbius et al, 1985). Additionally, observations from Polar comparing O + and O 6+ flux versus energy found that O 6+ had comparable flux values and a harder spectrum than O + at the highest energies (~200 keV; Allen et al, 2017).…”

Section: Introductionsupporting

confidence: 86%

Charge‐State‐Dependent Energization of Suprathermal Ions During Substorm Injections Observed by MMS in the Magnetotail

et al. 2020

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Understanding the energization processes and constituent composition of the plasma and energetic particles injected into the near-Earth region from the tail is an important component of understanding magnetospheric dynamics. In this study, we present multiple case studies of the high-energy (≳40 keV) suprathermal ion populations during energetic particle enhancement events observed by the Energetic Ion Spectrometer (EIS) on NASA's Magnetospheric Multiscale (MMS) mission in the magnetotail. We present results from correlation analysis of the flux response between different energy channels of different ion species (hydrogen, helium, and oxygen) for multiple cases. We demonstrate that this technique can be used to infer the dominant charge state of the heavy ions, despite the fact that charge is not directly measured by EIS. Using this technique, we find that the energization and dispersion of suprathermal ions during energetic particle enhancements concurrent with (or near) fast plasma flows are ordered by energy per charge state (E/q) throughout the magnetotail regions examined (~7 to 25 Earth radii). The ions with the highest energies (≳300 keV) are helium and oxygen of solar wind origin, which obtain their greater energization due to their higher charge states. Additionally, the case studies show that during these injections the flux ratio of enhancement is also well ordered by E/q. These results expand on previous results which showed that high-energy total ion measurements in the magnetosphere are dominated by high-charge-state heavy ions and that protons are often not the dominant species above~300 keV.

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Section: Introductionsupporting

confidence: 86%

Charge‐State‐Dependent Energization of Suprathermal Ions During Substorm Injections Observed by MMS in the Magnetotail

et al. 2020

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“…The mission terminated in July 1989. More information on the AMPTE/CCE satellite can be found in the work of Dassoulas et al [].…”

Section: Instrumentation and Data Setmentioning

confidence: 99%

Magnetic fluctuations embedded in dipolarization inside geosynchronous orbit and their associated selective acceleration of O⁺ ions

et al. 2014

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We study magnetic fluctuations embedded in dipolarizations in the inner magnetosphere (a geocentric distance of ≤6.6 R E ) and their associated ion flux changes, using the Engineering Test Satellite VIII and Active Magnetospheric Particle Tracer Explorers/CCE satellites. We select seven events of dipolarization that occur during the main phase of magnetic storms having a minimum value of the Dst index less than −40 nT. It is found that (1) all of the dipolarization events are accompanied by strong magnetic fluctuations with the major frequency close to the local O + gyrofrequency; (2) the magnetic fluctuations appear with significant amplitude in the component nearly parallel to the local magnetic field; (3) the strong flux enhancement is seen in the energy range of 1-10 keV only for O + ions. In terms of frequency and dominant components of the magnetic fluctuations, they are considered to be excited by the drift-driven electromagnetic ion cyclotron (EMIC) instability that is recently identified with the linear theory. We perform particle tracing for H + and O + ions in the electromagnetic fields modeled by the linear dispersion relation of the drift-driven EMIC instability. Results show that the O + ions are accelerated to the energy range of 0.5-5 keV and undergo a significant modification of the spectral shape, while the H + ions have no clear change of spectral shape, being consistent with the observations. We therefore suggest that the electromagnetic fluctuations associated with the dipolarizations can accelerate O + ions locally and nonadiabatically in the inner magnetosphere. This selective acceleration of O + ions may play a role in enhancing the O + energy density in the storm time ring current.

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“…This paper represents a development of our earlier work where, using the same data set, we analysed the average ring current density and pressure in the magnetospheric equatorial plane at four different magnetic local times (MLT=0000, 0600, 1200 and 1800). Dassoulas et al [1985], and the CHEM spectrometer has been described in detail by Gloeckler et al [1985]. However, we will summarize some of the features of the spacecraft orbit and of the spectrometer.…”

Section: Paper Number 1999ja900310mentioning

confidence: 99%

“…Measurements of ion distributions used to derive current densities in this study were made by the charge-energy-mass (CHEM) spectrometer on board the Charge Composition Explorer (CCE), one of the three AMPTE spacecraft. A description of the AMPTE/CCE spacecraft has been presented by Dassoulas et al [1985], and the CHEM spectrometer has been described in detail by Gloeckler et al [1985]. However, we will summarize some of the features of the spacecraft orbit and of the spectrometer.…”

Section: Reconstruction Of the Ring Currentmentioning

confidence: 99%

An average image of proton plasma pressure and of current systems in the equatorial plane derived from AMPTE/CCE‐CHEM measurements

Michelis¹,

Daglis²,

Consolini³

1999

J. Geophys. Res.

110

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Abstract. The present study attempts to visualize the global equatorial current systems and the proton pressure in the near-Earth magnetosphere based on AMPTE/CCE-CHEM measured proton distributions, which were sorted by the AE index ( "quiet": AE < 100 nT, "active": 100 nT < AE < 600 nT). The data were averaged over 2 years (from January 1985 to June 1987) in order to obtain the necessary spatial resolution with statistical significance. The results provide an average image of proton plasma pressure, proton plasma anisotropy, and current systems as a function of geomagnetic activity. In particular, the changes of pressure anisotropy with local time and the noon-midnight pressure asymmetry are studied and correlated to the current systems out of the equatorial plane that generate the closure circuits. Moreover, we identify and spatially locate two different current systems for the quiet period (the ring current and the inner portion of the quiet thne cross-tail current) and three different current structures for the active period (the ring current, the partial ring current, and the region 2 current).

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The AMPTE CCE Spacecraft

Cited by 17 publications

References 1 publication

Charge‐State‐Dependent Energization of Suprathermal Ions During Substorm Injections Observed by MMS in the Magnetotail

Charge‐State‐Dependent Energization of Suprathermal Ions During Substorm Injections Observed by MMS in the Magnetotail

Magnetic fluctuations embedded in dipolarization inside geosynchronous orbit and their associated selective acceleration of O⁺ ions

An average image of proton plasma pressure and of current systems in the equatorial plane derived from AMPTE/CCE‐CHEM measurements

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The AMPTE CCE Spacecraft

Cited by 17 publications

References 1 publication

Charge‐State‐Dependent Energization of Suprathermal Ions During Substorm Injections Observed by MMS in the Magnetotail

Charge‐State‐Dependent Energization of Suprathermal Ions During Substorm Injections Observed by MMS in the Magnetotail

Magnetic fluctuations embedded in dipolarization inside geosynchronous orbit and their associated selective acceleration of O+ ions

An average image of proton plasma pressure and of current systems in the equatorial plane derived from AMPTE/CCE‐CHEM measurements

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Magnetic fluctuations embedded in dipolarization inside geosynchronous orbit and their associated selective acceleration of O⁺ ions