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

Oct 1986

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986esla.symp.....m&link_type=abstract

Presented at the 20th ESLAB Symposium, Heidelberg, West Germany, 27 Oct. 1986

Physics

Axial Loads, Comet Tails, Cometary Magnetospheres, Giacobini-Zinner Comet, Magnetic Fields, Stresses, Comet Nuclei, Ice, Magnetohydrodynamics

Scientific paper

Utilizing the electron and magnetic field data from the ICE tail traversal of Comet Giacobini-Zinner along with the MHD equations, we have developed a steady state, stress balance model of the cometary magnetotail. With it we infer many important but unmeasured ion properties within the G-Z magnetotail both 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 pickup locations are approx. -75 km/sec (approx. -12), approx. 4 x 10 to the 6th power K (approx. 1 x 10 to the 5th power), approx. 20 / cu cm (approx. 400), and approx. .15 / cu cm/sec (approx. 3.6). Gradients in the plasma properties between these two regions are quite strong. Implications of our inferred plasma properties for the near-nucleus region and for cometary magnetotail formation are examined.

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