Observations of the Dusk Side Jovian Bow Shock and Magnetopause by Wave Investigations on Galileo and Cassini

Details Observations of the Dusk Side Jovian Bow Shock and Magnetopause by Wave Investigations on Galileo and Cassini Observations of the Dusk Side Jovian Bow Shock and Magnetopause by Wave Investigations on Galileo and Cassini

May 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001agusm...p52a05k&link_type=abstract

American Geophysical Union, Spring Meeting 2001, abstract #P52A-05

Other

2724 Magnetopause, Cusp, And Boundary Layers, 2740 Magnetospheric Configuration And Dynamics, 2772 Plasma Waves And Instabilities, 2784 Solar Wind/Magnetosphere Interactions, 5737 Magnetospheres (2756)

Scientific paper

On December 30, 2000, Cassini made its closest approach to Jupiter at a distance of 137 Jovian radii near 16 hours local time. During the same time, Galileo was completing its 28th and beginning its 29th orbit about Jupiter during its extended mission at Jupiter. Cassini's trajectory carried it nearly parallel to the expected dusk side bow shock and magnetopause boundaries. The apoapses of the two Galileo orbits during this time period were situated near 18.6 and 17.6 hours local time, respectively. The presence of both spacecraft at Jupiter during the same time period has afforded the first opportunity to make dual spacecraft measurements of the Jovian bow shock and magnetopause. Hence, this conjunction of two spacecraft has increased our observations of the dusk side boundaries from a single high-latitude pass by Ulysses to numerous observations in the near equatorial region. Furthermore, a number of these boundary crossings occurred within the same general epoch just after Cassini's closest approach. On January 9 and 10, the magnetosphere swelled sufficiently to extend beyond Cassini even though this spacecraft was at a distance of 200 Jovian radii in the post-dusk sector. Cassini's final exit through the magnetopause coincided with an outbound Galileo magnetopause crossing to within an hour, even though the two spacecraft were separated by nearly 150 Jovian radii. In this paper we examine the plasma wave signatures of the dusk side Jovian bow shock and magnetopause including upstream Langmuir and ion-acoustic waves, broadband wave turbulence at the shock itself, continuum radiation trapped in the outer dusk side magnetosphere, and electrostatic solitary structures near the magnetopause. Further, we consider the implications of the nearly simultaneous magnetopause crossings by the two well-separated spacecraft. On one hand, the simultaneity could be due to the two spacecraft coincidently being near the boundary at the same time, providing a two-point measure of the magnetopause shape for the first time. On the other hand, it is more likely that the magnetopause was reacting to a major change in the solar wind pressure, in which case the magnetopause shape would be significantly distorted under the gradient in solar wind conditions over the sizable distance between the two observation points.

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