Giotto magnetic-field results on the boundaries of the pile-up region and the magnetic cavity

Details Giotto magnetic-field results on the boundaries of the pile-up region and the magnetic cavity Giotto magnetic-field results on the boundaries of the pile-up region and the magnetic cavity

Nov 1987

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987a%26a...187...73n&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 187, no. 1-2, Nov. 1987, p. 73-79. BMFT-supported research.

Astronomy and Astrophysics

Astrophysics

58

Giotto Mission, Halley'S Comet, Magnetic Fields, Magnetic Measurement, Plasma Diagnostics, Solar Wind, Ionopause, Plasma Interactions

Scientific paper

Data from Giotto's magnetometer collected during the encounter at Comet Halley on March 13/14, 1986, were used to investigate the most conspicuous boundaries in the inner plasma region surronding Comet Halley, i.e., the pile-up boundary and the ionopause. The normal vectors at the boundary crossings were determined using the minimum variance technique. The magnetic pile-up boundary was modeled by a paraboloid with the axes of both surfaces aligned with the aberrated solar wind, yielding the values of the stand-off distance towards the aberrated solar wind to be equal to 215,000 km. For no flaring, i.e., a half-sphere cylinder shape, the stand-off distance was estimated to be 143,000 km. The results on the ionopause surface were inconsistent with a boundary with simple symmetry properties. The data indicate that the surface of the ionopause must be characterized either by a smooth surface of radius 4600 km displaced from the origin by 1500 km or strong ripples aligned with the aberrated solar wind direction, or a combination of both.

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