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Prediction for Encounter with Ion Tail of Comet 45P/Honda-Mrkos-Pajdusakova, ~July 6, 2006

Prediction for Encounter with Ion Tail of Comet 45P/Honda-Mrkos-Pajdusakova, ~July 6, 2006 (Sofie Spjuth). Green: comet path Yellow: ion tail for various v sw (blue: 400 km/s) Red square: Rosetta. For v sw = 400 km/s, Rosetta passed within 0.05 AU from ion tail at ~0.7 AU from comet.

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Prediction for Encounter with Ion Tail of Comet 45P/Honda-Mrkos-Pajdusakova, ~July 6, 2006

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  1. Prediction for Encounter with Ion Tail of Comet 45P/Honda-Mrkos-Pajdusakova, ~July 6, 2006 (Sofie Spjuth) Green: comet path Yellow: ion tail for various vsw (blue: 400 km/s) Red square: Rosetta For vsw = 400 km/s, Rosetta passed within 0.05 AU from ion tail at ~0.7 AU from comet.

  2. Problem(-s) And the list is not exhaustive... • Comet tail all to wide • Current (from MAG) does not make sense -- radial along tail direction • What is this? • What should a real comet tail look like?

  3. Ulysses Encounter with Hyakutake Ion Tail May 1, 1996 Now concluded by Some to be no comet tail at all... Ulysses-comet: > 3 AU Rosetta-comet: 0.7 AU Jones et al., Nature, 2000

  4. So, are there any real comet tail observations? • Sofie also checked for possible tail crossings for other s/c, including Spaceship Earth • PRAO-student Martin Hult checked ACE/IMP-8 data for Sofie’s pre- and postdictions • Best event: P/Catalina (2005 JQ5) July 9, 2005 (DOY 190)

  5. Something? + current sheet(?) + heavy ions - but density jump...

  6. Is this a comet tail crossing? • Minimum variance on B? • Models for what to find? • Other s/w disturbances -- what do they look like?? What do you know? • Any unambiguous signature of a comet tail? • Ideas? • Comments?

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