Magnetic field observations in comet Halley's coma

Reidler, W.; Schwingenschuh, K.; Yeroshenko, Ye.; Styashkin, V. A.; Russell, C. T.

doi:10.1038/321288a0

Cited by 156 publications

(50 citation statements)

References 9 publications

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“…There is evidence of only little nesting of different draping regions for VEGA 1 (Riedler et al, 1986), compared to what has been seen during the Giotto flyby (Raeder et al, 1987). Near closest approach before the saturation, during intervals 4, 5 and 6, there is a good draping fit.…”

Section: Interpretation Of Draping Fitmentioning

confidence: 78%

A comparison between VEGA 1, 2 and Giotto flybys of comet 1P/Halley: implications for Rosetta

et al. 2014

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Abstract. Three flybys of comet 1P/Halley, by VEGA 1, 2 and Giotto, are investigated with respect to the occurrence of mirror mode waves in the cometosheath and field line draping in the magnetic pile-up region around the nucleus. The time interval covered by these flybys is approximately 8 days, which is also the approximate length of an orbit or flyby of Rosetta around comet 67P/Churyumov-Gerasimenko. Thus any significant changes observed around Halley are changes that might occur for Rosetta during one pass of 67P/CG. It is found that the occurrence of mirror mode waves in the cometosheath is strongly influenced by the dynamical pressure of the solar wind and the outgassing rate of the comet. Field line draping happens in the magnetic pile-up region. Changes in nested draping regions (i.e. regions with different B x directions) can occur within a few days, possibly influenced by changes in the outgassing rate of the comet and thereby the conductivity of the cometary ionosphere.

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Section: Interpretation Of Draping Fitmentioning

confidence: 78%

A comparison between VEGA 1, 2 and Giotto flybys of comet 1P/Halley: implications for Rosetta

et al. 2014

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“…The boundary separating the fast solar wind plasma from the slower cometary plasma was found to be much more diffuse during the Giotto encounter Amata et al, 1987). Also near this location, the Giotto magnetometer observed a sudden jump in the magnetic field of « 20 nT (Neubauer, 1986(Neubauer, , 1987, whereas the magnetic field variations detected by the VEGA spacecraft were rather smooth (Riedler et al, 1986). In an effort to explain these discrepancies, Galeev et al (1988) have noted that during the VEGA encounter, the magnetic field was parallel to the relative motion of the two plasma components, giving rise to the firehose instability, which would rapidly decelerate the solar wind plasma.…”

Section: Collisionopause/cometopausementioning

confidence: 97%

The Global Interaction of Comets with the Solar Wind

Flammer

1991

International Astronomical Union Colloquium

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ABSTRACT. The global interaction of the solar wind with a comet as it orbits the Sun is reviewed. After a brief survey of the flow transition regions observed at comet Halley is presented, theoretical models are given for the cometocentric distance of the bow shock, the cometopause, and the ionopause. In addition, predictions are made as to what heliocentric distance these boundaries should form at. The results of these models are compared with the in situ observations at comet Halley.

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“…These phenomena have been well studied during the flybys of other comets in the last century (see e.g. Smith et al, 1986;Riedler et al, 1986;McComas et al, 1987;Raeder et al, 1987;Delva et al, 2014).…”

Section: Mass Loading Of the Induced Magnetospherementioning

confidence: 99%

Mass-loading, pile-up, and mirror-mode waves at comet 67P/Churyumov-Gerasimenko

et al. 2016

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Abstract. The data from all Rosetta plasma consortium instruments and from the ROSINA COPS instrument are used to study the interaction of the solar wind with the outgassing cometary nucleus of 67P/Churyumov-Gerasimenko. During 6 and 7 June 2015, the interaction was first dominated by an increase in the solar wind dynamic pressure, caused by a higher solar wind ion density. This pressure compressed the draped magnetic field around the comet, and the increase in solar wind electrons enhanced the ionization of the outflow gas through collisional ionization. The new ions are picked up by the solar wind magnetic field, and create a ring/ringbeam distribution, which, in a high-β plasma, is unstable for mirror mode wave generation. Two different kinds of mirror modes are observed: one of small size generated by locally ionized water and one of large size generated by ionization and pick-up farther away from the comet.

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Magnetic field observations in comet Halley's coma

Cited by 156 publications

References 9 publications

A comparison between VEGA 1, 2 and Giotto flybys of comet 1P/Halley: implications for Rosetta

A comparison between VEGA 1, 2 and Giotto flybys of comet 1P/Halley: implications for Rosetta

The Global Interaction of Comets with the Solar Wind

Mass-loading, pile-up, and mirror-mode waves at comet 67P/Churyumov-Gerasimenko

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