Observations of the geopause at the equatorial magnetopause: Density and temperature

Chandler, M. O.; Moore, T. E.

doi:10.1029/2003gl017611

Cited by 26 publications

(29 citation statements)

References 13 publications

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“…The plot shows three closely spaced crossing of the magnetopause during steady northward IMF wind dynamic pressure at geosynchronous orbit. The Cluster spacecraft have also measured cold ions near the high latitude magnetopause (Sauvaud et al 2001) and Chandler and Moore (2003) reported cold plasma densities as high as 70 cm −3 from Polar satellite observations near the equatorial magnetopause.…”

Section: Plasmaspheric Plumes and Cold Plasmamentioning

confidence: 97%

THEMIS ESA First Science Results and Performance Issues

et al. 2008

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Early observations by the THEMIS ESA plasma instrument have revealed new details of the dayside magnetosphere. As an introduction to THEMIS plasma data, this paper presents observations of plasmaspheric plumes, ionospheric ion outflows, field line resonances, structure at the low latitude boundary layer, flux transfer events at the magnetopause, and wave and particle interactions at the bow shock. These observations demonstrate the capabilities of the plasma sensors and the synergy of its measurements with the other THEMIS experiments. In addition, the paper includes discussions of various performance issues with the ESA instrument such as sources of sensor background, measurement limitations, and data formatting problems. These initial results demonstrate successful achievement of all measurement objectives for the plasma instrument.

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Section: Plasmaspheric Plumes and Cold Plasmamentioning

confidence: 97%

THEMIS ESA First Science Results and Performance Issues

et al. 2008

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“…Cold ions (up to few tens of eV) often reach the dayside magnetopause [e.g., Sauvaud et al, 2001;André and Cully, 2012;Lee et al, 2016;Chandler and Moore, 2003;Chen and Moore, 2006] and participate in reconnection [e.g., Chandler et al, 1999;Chen and Moore, 2004]. They belong to the plasma cloak, plasmaspheric wind, or plasmaspheric drainage plumes [e.g., Chappell et al, 2008;Darrouzet et al, 2008].…”

Section: Citationmentioning

confidence: 99%

Cold ion demagnetization near the X‐line of magnetic reconnection

Toledo‐Redondo

André

Khotyaintsev

et al. 2016

Geophysical Research Letters

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Although the effects of magnetic reconnection in magnetospheres can be observed at planetary scales, reconnection is initiated at electron scales in a plasma. Surrounding the electron diffusion region, there is an Ion‐Decoupling Region (IDR) of the size of the ion length scales (inertial length and gyroradius). Reconnection at the Earth's magnetopause often includes cold magnetospheric (few tens of eV), hot magnetospheric (10 keV), and magnetosheath (1 keV) ions, with different gyroradius length scales. We report observations of a subregion inside the IDR of the size of the cold ion population gyroradius (∼15 km) where the cold ions are demagnetized and accelerated parallel to the Hall electric field. Outside the subregion, cold ions follow the E × B motion together with electrons, while hot ions are demagnetized. We observe a sharp cold ion density gradient separating the two regions, which we identify as the cold and hot IDRs.

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“…An interesting feature is that a majority of the dense ions are not streaming tailward, but are nearly stagnant, making a contrast with the traditional LLBL. It must be pointed out that the energy coverage of the Geotail ion instrument is from 32 eV to 39 keV and that in the dense region the speed of the convective (field line) motion is relatively small, so that it is unlikely that plasmaspheric cold ions, encountered occasionally even near the magnetopause [e.g., Chandler and Moore, 2003], are brought into the energy range of the instrument and are responsible for the dense feature. Thus the results indicate that the dense ions identified from our data set originate from the solar wind.…”

Section: Discussionmentioning

confidence: 99%

Dense and stagnant ions in the low‐latitude boundary region under northward interplanetary magnetic field

Hasegawa

Fujimoto

Saito

et al. 2004

Geophysical Research Letters

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The ion behavior in the low‐latitude boundary region is studied based on Geotail data accumulated over several years, toward understanding the formation mechanism of the cold‐dense plasma sheet under prolonged northward interplanetary magnetic field (IMF). A statistical survey shows that, during extended northward IMF, (1) dense magnetosheath‐like ions appear far more often, especially on the flanks, (2) the dense ions are mostly stagnant, in contrast to those in the classical low‐latitude boundary layer (LLBL), (3) a substantial fraction of the dense and stagnant ions is spatially mixed with hot magnetospheric ions, and (4) the mixed ion population has magnetic local time dependence in ion mixing state in energy space. Based on these findings, we argue that, under extended northward IMF, a significant transfer of the solar wind/LLBL ions onto the magnetospheric field lines occurs on the flanks, and the transport/heating process of the entrant ions is different for different local times.

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Observations of the geopause at the equatorial magnetopause: Density and temperature

Cited by 26 publications

References 13 publications

THEMIS ESA First Science Results and Performance Issues

THEMIS ESA First Science Results and Performance Issues

Cold ion demagnetization near the X‐line of magnetic reconnection

Dense and stagnant ions in the low‐latitude boundary region under northward interplanetary magnetic field

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