Magnetic fields near Mars: first results

Riedler, W.; Möhlmann, D.; Oraevsky, V. N.; Schwingenschuh, K.; Yeroshenko, Ye.; Rustenbach, J.; Aydogar, Özer; Berghofer, G.; Lichtenegger, Herbert; Delva, M.; Schelch, G.; Pirsch, K.; Fremuth, G.; Steller, M.; Arnold, H. J. P.; Raditsch, T.; Auster, U.; Fornacon, K. H.; Schenk, H. J.; Michaelis, H.; Motschmann, U.; Roatsch, T.; Sauer, K.; Schröter, R.; Kurths, Jüergen; Lenners, D.; Linthe, J.; Kobzev, V. G.; Styashkin, V. A.; Achache, J.; Slavin, J. A.; Luhmann, J. G.; Russell, C. T.

doi:10.1038/341604a0

Cited by 251 publications

(89 citation statements)

References 6 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…In one-to-one SLED data/hybrid model comparisons to be made in future, it will be necessary to use realistic upstream parameters in the hybrid model runs. Fortunately, such solar wind plasma parameters are already available in the contemporaneous data of the ASPERA and TAUS instruments flown aboard Phobos-2 (Lundin et al, 1989;Rosenbauer et al, 1989) and complementary magnetic field measurements made by the onboard MAG instrument are also available (Riedler et al, 1989). In future one-to-one comparisons between the in situ measurements and the simulations, the upstream parameters, especially the IMF, should remain unaltered so that the simulated electromagnetic field environment can correspond to the real conditions.…”

Section: Analysis Of the Sled Datamentioning

confidence: 99%

Magnetic shadowing of high energy ions at Mars and how this effect can be simulated using a hybrid model

et al. 2012

View full text Add to dashboard Cite

Energetic particle data recorded by the SLED instrument aboard Phobos-2 while in circular orbit about Mars (6-26 March, 1989) showed the presence of magnetic shadowing. A 3-D, self consistent, hybrid model (HYBMars) supplemented by test particle simulations was developed to study the response of the Martian plasma environment to solar disturbances and to reproduce, in particular, the magnetic shadowing effect. The pertaining magnetic and electric fields as well as the properties of high energy ions present at Mars under conditions of extreme solar disturbances, can be derived from HYB-Mars. This model predicted a plasma phenomenon at the planet, named here 'solar wind-flow shadowing', which was earlier identified in the measurements of the ASPERA (plasma) experiment aboard Phobos-2. HYB also predicted magnetic shadowing which is qualitatively similar to that recorded by SLED. The simulations suggest that the configuration of a magnetic shadow depends on the pertaining solar wind density and velocity, and on the magnitude and direction of the interplanetary magnetic field. It is currently planned to input to the HYB model plasma and magnetic field data measured contemporaneously with the particle measurements aboard Phobos-2 so as to more realistically match the simulated results with the in situ observations.

show abstract

Section: Analysis Of the Sled Datamentioning

confidence: 99%

Magnetic shadowing of high energy ions at Mars and how this effect can be simulated using a hybrid model

et al. 2012

View full text Add to dashboard Cite

show abstract

“…Since most of the available data were collected with a resolution of 45 s [Riedler et al, 1989], measurements of higher resolution were averaged by 45 s in order to work with a uniform data set. The spacecraft often lost three-axis stabilization therefore despun magnetic field components had to be used in many cases.…”

Section: Observationsmentioning

confidence: 99%

Magnetic field overshoots in the Martian bow shock

Tátrallyay¹,

Gevai²,

Apáthy³

et al. 1997

J. Geophys. Res.

Self Cite

View full text Add to dashboard Cite

Abstract. In 1989 the Phobos 2 spacecraft provided sufficient plasma and magnetic field data for statistical investigations of the Martian bow shock structure. Significant magnetic field overshoots were observed in more than 70% of the bow shock crossings detected in the terminator region. According to our studies based on the available low-resolution data set, the features of the Martian overshoots are very similar to those observed in the terrestrial and Venusian bow shock: the magnitude increases with increasing Mach number and the thickness scales as the proton gyroradius computed from the upstream solar wind speed and magnetic field strength. Our investigations seem to support the idea of Mellott and Livesey [1987]

show abstract

“…In 1989, during its first three elliptical orbits around Mars, the Phobos-2 spacecraft observed significant plasma and magnetic field perturbations near the crossings of the orbit of the Martian moon Phobos (Riedler et al, 1989; see also Figs. 1 and 4).…”

Section: Introductionmentioning

confidence: 99%

“Phobos events”—Signatures of solar wind interaction with a gas torus?

et al. 2014

Self Cite

View full text Add to dashboard Cite

Following recent simulations of the Phobos dust belt formation (Krivov and Hamilton, 1997), the effective dustinduced charge density as estimated is too small to account for the significant solar wind (sw) plasma and magnetic field perturbations observed by the Phobos-2 spacecraft in 1989 near the crossings of the Phobos orbit. In this paper the sw interaction with the Phobos neutral gas torus is re-investigated in a two-ion plasma model in which the newly created ions are treated as unmagnetized, forming a beam (not a ring beam) in the sw frame. A linear instability analysis based on both a cold fluid and a kinetic approach shows that electromagnetic ion beam waves in the whistler range of frequencies, driven most unstable at oblique propagation and appearing as almost purely growing waves in the beam frame, aquire high growth rates and provide a likely mechanism to cause the observed events.

show abstract

Magnetic fields near Mars: first results

Cited by 251 publications

References 6 publications

Magnetic shadowing of high energy ions at Mars and how this effect can be simulated using a hybrid model

Magnetic shadowing of high energy ions at Mars and how this effect can be simulated using a hybrid model

Magnetic field overshoots in the Martian bow shock

“Phobos events”—Signatures of solar wind interaction with a gas torus?

Contact Info

Product

Resources

About