Remote analysis of cleft ion acceleration using thermal plasma measurements from Interball Auroral Probe

Dubouloz, N.; Delcourt, Dominique; Malingre, M.; Berthelier, J. J.; Чугунин, Д. В.

doi:10.1029/98gl02181

Cited by 24 publications

(28 citation statements)

References 12 publications

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“…The importance of the other two limitations is described in Fig. 2, and also discussed in Dubouloz et al (1998). Essentially, if the convection is entirely along the spacecraft .…”

Section: Estimating the Source Regionmentioning

confidence: 99%

“…the cusp) as a spatial reference for observations of upflowing ionospheric ions (of energies up to 450 eV) and could confirm the vicinity of the cusp as the source region. Dubouloz et al (1998Dubouloz et al ( , 2001 used Interball data together with convection estimates and a test particle simulation to backtrace the observed particles and obtain an even better determination of the source region: a 2 • latitudinal width region inside the dayside cleft. Some energization was observed to occur up to 10 000 km altitude, though less efficient at higher altitude.…”

Section: Introductionmentioning

confidence: 99%

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The structure of high altitude O+ energization and outflow: a case study

et al. 2004

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Abstract. Multi-spacecraft observations from the CIS ion spectrometers on board the Cluster spacecraft have been used to study the structure of high-altitude oxygen ion energization and outflow. A case study taken from 12 April 2004 is discussed in more detail. In this case the spacecraft crossed the polar cap, mantle and high-altitude cusp region at altitudes between 4 R E and 8 R E and 2 of the spacecraft provided data. The oxygen ions were seen as a beam with narrow energy distribution, and increasing field-aligned velocity and temperature at higher altitude further in the upstream flow direction. The peak O + energy was typically just above the highest energy of observed protons. The observed energies reached the upper limit of the CIS ion spectrometer, i.e. 38 keV. Moment data from the spacecraft have been crosscorrelated to determine cross-correlation coefficients, as well as the phase delay between the spacecraft. Structures in ion density, temperature and field-aligned flow appear to drift with the observed field-perpendicular drift. This, together with a velocity dispersion analysis, indicates that much of the structure can be explained by transverse heating well below the spacecraft. However, temperature isotropy and the particle flux as a function of field-aligned velocity are inconsistent with a single altitude Maxwellian source. Heating over extended altitude intervals, possibly all the way up to the observation point, seem consistent with the observations.

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“…The importance of the other two limitations is described in Fig. 2, and also discussed in Dubouloz et al (1998). Essentially, if the convection is entirely along the spacecraft .…”

Section: Estimating the Source Regionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

The structure of high altitude O+ energization and outflow: a case study

et al. 2004

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“…3b). This picture can be explained by transverse heating in a region of finite latitudinal extent, followed by adiabatic convective flow to the satellite orbit (Horwitz, 1986;Dubouloz et al, 1998;Bouhram et al, 2003a,b). The latter stage also contributes to a velocity filter effect, as evidenced by the observation of latitude-energy dispersion in ion energy spectra.…”

Section: September 2001 Casementioning

confidence: 99%

Multipoint analysis of the spatio-temporal coherence of dayside O+ outflows with Cluster

et al. 2004

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Abstract. The spatial distribution of ionospheric ion outflow from the dayside cusp/cleft has previously been studied in great detail with numerous satellite missions, but only statistically. Between July and November 2001, the orbit configuration of the Cluster multi-satellite system close to its perigee (4 Earth radii) allows for delay times between spacecraft of about 4 and 35 min in crossing the cusp/cleft. This enables for the first time to assess the spatial and temporal coherence of O + ion outflow on time scales of the order of the satellite time lag. After presenting two contrasting events in detail, O + velocities and outflow intensities from three spacecraft, available on 18 events, all with a similar orbit, have been cross-correlated to quantify the degree of coherence in the outflow. The main result from the analysis is that, although dayside outflows are a permanent feature, steady-state conditions are surprisingly never achieved. In particular, a significant variability is found for convection drift and local outflow intensities on small time scales. This variability of local intensities is not found to depend on the total strenghth of the outflow, which is much more stable and increases with the dynamic solar wind pressure.

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“…The above results, which are described in more detail by Dubouloz et al [1998b], are expected to help in determining which of these mechanisms is (are) domi nant. …”

Section: Page 563mentioning

confidence: 99%

Interball auroral probe studies Earth's ionized regions

Dubouloz¹,

Delcourt²,

Berthelier³

et al. 1998

EoS Transactions

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Research has shown that spectrometers measuring low energy ions are essential tools for investigating both the spatial extent and the physical nature of ion acceleration processes in the Earth's ionized environment. Such a device was one of a number of experiments onboard the Interball Auroral Probe (Interball AP) launched by the Russian Space Agency in 1996. Such in situ measurements are crucial for understanding the dynamics of the Earth's ionized environment and offer an excellent opportunity for analyzing fundamental plasma processes that usually can be observed only remotely. In a way similar to the solar corona, the Earth's ionosphere and low‐altitude magnetosphere are affected by an expansion process. At high latitudes in the auroral and polar regions, pressure gradients and ambipolar electric fields are responsible for a so‐called “polar wind” flowing out of the topside ionosphere at low energies (several eVs). In addition to this “classical” polar wind picture, other processes also lead to significant plasma ejection into the magnetosphere.

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Remote analysis of cleft ion acceleration using thermal plasma measurements from Interball Auroral Probe

Cited by 24 publications

References 12 publications

The structure of high altitude O<sup>+</sup> energization and outflow: a case study

The structure of high altitude O<sup>+</sup> energization and outflow: a case study

Multipoint analysis of the spatio-temporal coherence of dayside O<sup>+</sup> outflows with Cluster

Interball auroral probe studies Earth's ionized regions

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Remote analysis of cleft ion acceleration using thermal plasma measurements from Interball Auroral Probe

Cited by 24 publications

References 12 publications

The structure of high altitude O&lt;sup&gt;+&lt;/sup&gt; energization and outflow: a case study

The structure of high altitude O&lt;sup&gt;+&lt;/sup&gt; energization and outflow: a case study

Multipoint analysis of the spatio-temporal coherence of dayside O&lt;sup&gt;+&lt;/sup&gt; outflows with Cluster

Interball auroral probe studies Earth's ionized regions

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Resources

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The structure of high altitude O<sup>+</sup> energization and outflow: a case study

The structure of high altitude O<sup>+</sup> energization and outflow: a case study

Multipoint analysis of the spatio-temporal coherence of dayside O<sup>+</sup> outflows with Cluster