Far tail (255RE) fast response to very weak magnetic activity

Sauvaud, J. A.; Opitz, A.; Palin, L.; Lavraud, B.; Jacquey, C.; Kistler, L. M.; Frey, H. U.; Luhmann, J. G.; Larson, D. E.; Russell, C. T.

doi:10.1029/2010ja016077

Cited by 4 publications

(5 citation statements)

References 38 publications

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“…ISEE-3 made six orbits into the distant magnetotail (Bame et al, 1983(Bame et al, ) in 1982(Bame et al, -1983; the mission was hampered by the absence of ion measurements; however, plasma flow velocities were obtained from electron measurements. In February of 2007 the STEREO-B spacecraft made several encounters with the distant magnetotail (Opitz et al, 2014;Sauvaud et al, 2011), although plasma flow vectors in the magnetotail may not be available.…”

Section: Future Work Neededmentioning

confidence: 99%

Looking for Evidence of Wind‐Shear Disconnections of the Earth's Magnetotail: GEOTAIL Measurements and LFM MHD Simulations

Borovsky

2018

JGR Space Physics

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Disconnections of the Earth's magnetotail caused by abrupt wind shear in the solar wind are predicted by global magnetohydrodynamic simulations. Further, analysis of ACE spacecraft measurements finds that strong wind shears in the solar wind at Earth are common. In this report GEOTAIL observations in the distant (~200 RE) magnetotail are used to look for evidence of these predicted disconnection events. Three‐dimensional global magnetohydrodynamic simulations using the LFM (Lyon‐Fedder‐Mobary) code were run to determine the expected signatures of magnetotail‐disconnection events as seen by a spacecraft. Fourty‐four magnetotail entry events on the dawnside of the distant magnetotail in the years 1993–1994 were examined individually and using superposed‐epoch analysis. Signatures in the GEOTAIL measurements consistent with entry into the magnetotail from the magnetosheath caused by disconnection events were seen, particularly the temporal pattern of plasma flow and the temporal pattern of the magnetic field direction. Conclusive observations of magnetotail disconnections will probably have to await having measurements with a constellation of spacecraft in the magnetotail.

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Section: Future Work Neededmentioning

confidence: 99%

Looking for Evidence of Wind‐Shear Disconnections of the Earth's Magnetotail: GEOTAIL Measurements and LFM MHD Simulations

Borovsky

2018

JGR Space Physics

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“…Before the critical manoeuvre with our moon the two satellites crossed the Earth magnetosphere numerous times. After their separation, STB intersected the flank, the magnetosheath, the magnetopause and the regions of the night side magnetosphere in the early phase of its heliospheric mission (Kistler et al, 2010;Sauvaud et al, 2011;Opitz et al, 2014). The Earth flybys and the near-Earth period of STEREO were analysed.…”

Section: Observationsmentioning

confidence: 99%

Hot flow anomaly remnant in the far geotail?

Facskó

Opitz

Lavraud

et al. 2015

Journal of Atmospheric and Solar-Terrestrial Physics

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A hot flow anomaly (HFA) like event was observed by the Solar TErrestrial RElations Observatory (STEREO) in the night side magnetosheath in the far tail in February-March 2007. The magnetic signature of the tangential discontinuity was visible, but the resolution of the plasma ion data is not sufficient for our analysis, so a method is given to identify HFAs without solar wind velocity measurements. The event observed in the night side magnetosheath in the far tail might be the remnant of an HFA event, a not-so-active current sheet. This observation suggests that the lifetime of the HFAs might be several 10 minutes, much longer than the expected several minutes.Comment: accepted on January 23, 2015 to Journal of Atmospheric and Solar-Terrestrial Physics. 5 pages, 2 figure

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“…[], who analyzed a plasma sheet crossing on 13 February 2007 and by Sauvaud et al . [], who studied three successive events on 21 February 2007, when STB exited the magnetotail due to tail contraction.…”

Section: Magnetospheric Regimes Crossed By Stbmentioning

confidence: 99%

“…The STB measurements show spatial variations due to the structured far tail along with temporal variations due to intensive tail dynamics leading to tail flappings, expansions, and contractions, which makes the observing spacecraft exit and enter the different plasma regimes. These multiple magnetopause crossings were studied by Kistler et al [2010], who analyzed a plasma sheet crossing on 13 February 2007 and by Sauvaud et al [2011], who studied three successive events on 21 February 2007, when STB exited the magnetotail due to tail contraction.…”

Section: Magnetospheric Regimes Crossed By Stbmentioning

confidence: 99%

“…The STEREO Ahead (STA) spacecraft was in front of the Earth, while the STEREO Behind (STB) spacecraft flew in the vicinity of the terrestrial magnetotail and crossed different plasma regions there. In February the STB spacecraft was located in the dusk magnetosheath most of the time but experienced several incursions into the distant magnetotail [ Kistler et al ., ; Sauvaud et al ., ]. Then in March, STB finally left the terrestrial magnetosheath and flew into the solar wind.…”

Section: Introductionmentioning

confidence: 99%

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Solar wind control of the terrestrial magnetotail as seen by STEREO

et al. 2014

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At the beginning of 2007 the twin STEREO spacecraft provided a unique opportunity to study the global solar wind control of the terrestrial magnetotail under typical solar activity minimum conditions. The STEREO-B (STB) spacecraft flew in the vicinity of the far terrestrial magnetotail, while the STEREO-A (STA) spacecraft was located in front of the Earth performing measurements in the undisturbed solar wind. In February, the STB spacecraft was located in the magnetosheath most of the time but experienced several incursions into the distant magnetotail. Comparison of STA and STB observations determines unambiguously whether solar wind events such as energetic particle enhancements observed by STB are of pure solar origin or due to the influence of the terrestrial magnetosphere. During this time period in 2007, there were solar minimum conditions with alternating fast and slow solar wind streams that formed corotating interaction regions, which were the dominating source of magnetospheric disturbances encountering the Earth almost every week. Under these conditions, STB experienced multiple bow shock and magnetopause crossings due to the induced highly dynamic behavior of the terrestrial magnetotail and detected bursts of tailward directed energetic ions in the range of 110-2200 keV accompanied by suprathermal electrons of~700-1500 eV, which were not seen in the undisturbed solar wind by STA. The corotating interaction regions triggered these energetic particle enhancements, and we demonstrate their magnetosphere-related origin. Even after leaving the magnetosheath in March 2007, STB continued to observe antisunward directed energetic ion bursts until May up to a distance of~800 R E behind Earth, the largest distance to which solar wind and magnetospheric interaction has been observed. These results show that Earth is a very significant source of energetic particles in its local interplanetary environment.

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Far tail (255R_E) fast response to very weak magnetic activity

Cited by 4 publications

References 38 publications

Looking for Evidence of Wind‐Shear Disconnections of the Earth's Magnetotail: GEOTAIL Measurements and LFM MHD Simulations

Looking for Evidence of Wind‐Shear Disconnections of the Earth's Magnetotail: GEOTAIL Measurements and LFM MHD Simulations

Hot flow anomaly remnant in the far geotail?

Solar wind control of the terrestrial magnetotail as seen by STEREO

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