The INTERBALL-Tail ELECTRON experiment: initial results on the low-latitude boundary layer of the dawn magnetosphere

Sauvaud, J. A.; Koperski, P.; Beutier, T.; Barthe, H.; Aoustin, C.; Thocaven, J. J.; Rouzaud, Jean-Noël; Вайсберг, О. Л.; Borodkova, Natalia

doi:10.1007/s005850050474

Cited by 15 publications

(20 citation statements)

References 2 publications

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“…Interball-1 and Magion-4 magnetopause crossings were identified manually on the basis of observations of ion and electron energy spectra (Yermolaev et al, 1997;Sauvaud et al, 1997;Nemecek et al, 1997) and the magnetic field (Nozdrachev et al, 1998). Geotail magnetopause crossings were computed automatically on the basis of the magnetic field changes (Ivchenko et al, 2000).…”

Section: Data Set and Methodologymentioning

confidence: 99%

The magnetopause shape and location: a comparison of the Interball and Geotail observations with models

et al. 2002

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Abstract.A number of magnetopause models have been developed in the course of last three decades. We have chosen seven of them and tested them using a fresh set of magnetopause crossings observed by Interball-1, Magion-4, and Geotail satellites. The crossings cover the magnetopause from the subsolar region up to near-Earth tail (X GSE ∼ −20 R E ) and all geomagnetic latitudes. Our study reveals that (1) the difference between investigated models is smaller than the error of prediction caused by the factors not included in models, (2) the dayside magnetopause is indented in the cusp region, (3) the deepness of the indentation can reach ∼ 4 R E , and (4) the dimensions of the indentation do not depend on the dipole tilt, whereas its location does.

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Section: Data Set and Methodologymentioning

confidence: 99%

The magnetopause shape and location: a comparison of the Interball and Geotail observations with models

et al. 2002

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“…CORALL is the nearly-hemispheric electrostatic analyzer which measured the ions with energies 0.3-24 keV/q (Yermolaev et al, 1997). ELECTRON (Sauvaud et al, 1997) is a "top-hat" quadri-spherical electron spectrometer that uses the microchannel plates to measure the electrons with energies ranging from 0.01 to 26 keV. The DOK-2 spectrometer (Lutsenko et al, 1998) measures the energy spectra of electrons and ions using four telescopes with solid-state silicon detectors.…”

Section: Observationsmentioning

confidence: 99%

Correlated Interball/ground-based observations of isolated substorm: The pseudobreakup phase

et al. 2001

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Abstract. We study the isolated substorm that occurred after a long quiet period, which showed all of the substorm signatures except for the first half hour of the expansion phase, which could be characterized as a pseudobreakup sequence, rather than a full-scale substorm onset. During the considered event, the substorm's instability leads to a current disruption, which starts at the near-Earth plasma sheet and then propagates tailward. Based on auroral observations, the analysis of geosynchronous plasma injections, and the plasma sheet observations at ∼15 R E at the meridian of auroral substorm development we show that (1) before and probably during "pseudobreakup phase", the plasma sheet stayed cold and dense, (2) during the pseudobreakup phase, particle injections at 6.6 R E were only seen in unusually low energy components, and (3) the electron precipitation into the ionosphere was very soft. We conclude that the basic difference between pseudobreakups and "real" substorm activations was found in the low energy of all manifestations. We suggest that high density and low electron temperature in the plasma sheet are the reasons for low energization in the magnetic reconnection operated on closed field lines in the plasma sheet, as well as the weak field-aligned acceleration, as predicted by the Knight's relationship. The low Hall conductivity could then be the reason for the weak ground magnetic effects observed. This explanation suggests that the role of the ionospheric conductivity is "passive" as the plasma sheet, rather than the ionosphere, controls the development of the magnetospheric instability.

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“…The LLBL is often found to contain such streams of bi-directional electrons flowing in the magnetic field parallel and antiparallel directions with energies of typically 20-500 eV. These counterstreaming electrons are observed at low-altitudes (Zanetti et al, 1981), at mid-altitudes (Sharp et al, 1980;Collin et al, 1982;Lundin et al, 1987;Yoshioka et al, 2000), at highaltitudes (Lin et al, 1982;Hultqvist et al, 1991), and close to the magnetopause (Ogilvie et al, 1984;Farrugia et al, 1988;Klumpar et al, 1988;Traver et al, 1991;Fuselier et al, 1995Fuselier et al, , 1997Sauvaud et al, 1997). Furthermore, counterstreaming electrons are present most of the time along the dayside magnetopause (Hall et al, 1991;Miyake et al, 1998).…”

Section: Introductionmentioning

confidence: 99%

Simultaneous optical, CUTLASS HF radar, and FAST spacecraft observations: signatures of boundary layer processes in the cusp

et al. 2004

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Abstract. In this paper we discuss counterstreaming electrons, electric field turbulence, HF radar spectral width enhancements, and field-aligned currents in the southward IMF cusp region. Electric field and particle observations from the FAST spacecraft are compared with CUTLASS Finland spectral width enhancements and ground-based optical data from Svalbard during a meridional crossing of the cusp. The observed 630 nm rayed arc (Type-1 cusp aurora) is associated with stepped cusp ion signatures. Simultaneous counterstreaming low-energy electrons on open magnetic field lines lead us to propose that such electrons may be an important source for rayed red arcs through pitch angle scattering in collisions with the upper atmosphere. The observed particle precipitation and electric field turbulence are found to be nearly collocated with the equatorward edge of the optical cusp, in a region where CUTLASS Finland also observed enhanced spectral width. The electric field turbulence is observed to extend far poleward of the optical cusp. The broad-band electric field turbulence corresponds to spatial scale lengths down to 5 m. Therefore, we suggest that electric field irregularities are directly responsible for the formation of HF radar backscatter targets and may also explain the observed wide spectra. FAST also encountered two narrow highly structured field-aligned current pairs flowing near the edges of cusp ion steps.

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The INTERBALL-Tail ELECTRON experiment: initial results on the low-latitude boundary layer of the dawn magnetosphere

Cited by 15 publications

References 2 publications

The magnetopause shape and location: a comparison of the Interball and Geotail observations with models

The magnetopause shape and location: a comparison of the Interball and Geotail observations with models

Correlated Interball/ground-based observations of isolated substorm: The pseudobreakup phase

Simultaneous optical, CUTLASS HF radar, and FAST spacecraft observations: signatures of boundary layer processes in the cusp

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