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Título:
Magnetic field draping and pile up boundary at Comet Halley from Vega-1 observations
Autor/es:
DELVA, M.; BERTUCCI, C.; MAZELLE, C.; SCHWINGENSCHUH, K.
Reunión:
Congreso; 35th COSPAR Scientific Assembly; 2004
Resumen:
The start of the Rosetta mission to Comet Churyumov-Gerasimenko and new
insights in the plasma regions of non-magnetic solar system bodies lead
to re-investigation of magnetic field data from the Vega-1 mission to
Comet Halley (1986). Recently, the magnetic pile up boundary has been
identified as a common feature for all atmospheric unmagnetized bodies.
This boundary marks the outer edge of the magnetic pile up region, known
as the magnetic barrier region, where the magnetic field is strong and
highly draped. From the Vega-1 magnetometer data, the magnetic field
draping around Comet Halley was initially clearly identified through
reversal of the field component in direction to the Sun at closest
approach. In addition, a more detailed analysis is now performed in
regions further upstream in the magnetosheath. The Vega-1 high
resolution magnetometer data (10 vectors/sec) on the in-and out-bound
leg but inside the bow wave are reinvestigated in search for the
magnetic pile up boundary as an indicator for the outer edge of the
magnetic barrier. The magnetic field pile up region with enhancement of
field draping is studied by means of correlation-techniques, which
proved very successful for Venus, Mars and also for comets
Giacobini-Zinner and Halley in the case of Giotto observations.
Furthermore, this promising technique is also relevant for the upcoming
mission Venus-Express, carrying two magnetometers, and is expected to
reveal further details about the nature of the magnetic barrier at
Venus.