The Comet Giacobini-Zinner magnetotail: Axial stresses and inferred near-nucleus properties

Details The Comet Giacobini-Zinner magnetotail: Axial stresses and inferred near-nucleus properties The Comet Giacobini-Zinner magnetotail: Axial stresses and inferred near-nucleus properties

Dec 1986

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986esasp.250a.301m&link_type=abstract

In ESA Proceedings of the 20th ESLAB Symposium on the Exploration of Halley's Comet. Volume 1: Plasma and Gas p 301-304 (SEE N87

Physics

Axial Stress, Comet Nuclei, Comet Tails, Cometary Magnetospheres, Giacobini-Zinner Comet, Interplanetary Magnetic Fields, Current Sheets, Dynamic Models, Flow Velocity, International Sun Earth Explorer 3, Ion Density (Concentration), Ion Sources, Ion Temperature, Magnetohydrodynamics

Scientific paper

Utilizing the electron and magnetic field data from the ICE tail traversal of comet Giacobini-Zinner along with the MHD equations, a steady state, stress balance model of the cometary magnetotail was developed, and used to infer important but unmeasured ion properties within the magnetotail at ICE and upstream at the average point along each streamline where cometary ions are picked-up. The derived tailward ion flow speed at ICE is quite constant at approx. -20 to -30 km/sec across the entire tail. The flow velocity, ion temperature, density, and ion source rates upstream from the lobes (current sheet) at the average pick-up locations are approx. -75 km/sec (approx. -12), approx. 4 million K (approx. 100,000), approx. 20 cc (approx. 400), and approx. 15 cu cm/sec. Gradients in the plasma properties between the two regions are quite strong. Implications of inferred plasma properties for the near-nucleus region and for cometary magnetotail formation are examined.

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