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1
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2
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3
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- Location where the Solar Wind is slowed to subsonic speeds so that it
can merge with the local interstellar medium
- Estimated to lie between ~90 and 100 au
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4
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5
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6
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- Sunward ion and e- beams on 2004/350
- Markedly reduced particle intensity variations, reduced ion beaming
anisotropies, and increased low-energy ion intensities after 2004/351
- The ~120-day stretch in 2005 when the Velocity of the SW fluctuated
about zero
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7
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- Data collected from 2002.0 to 2005.5 (83.4 to 96.0 AU) arranged into 4 periods
- A: 2002.58 to 2003.10
- First indication of new (foreshock) phenomena
- B: 2003.10 to 2004.07
- Year-long diminution of energetic ion intensities
- C: 2004.07 to 2004.96
- Year-long return to high intensities
- D: 2004.96 to 2005.50
- Began on 2004/350 with a short-lived (few hours) intensity spike of
ions 40 keV to 20 MeV and of e- 0.35 to 1.5 MeV
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8
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9
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- Angular rate data from 2004/344 to 2004/359
- Large Anisotropy observed on 2004/350 (using sections 3 and 7)
- Ions and e- streaming sunward as well as plasma oscillations
indicate that the B-field was nearly tangent to the TS surface.
- A jump in the B-field magnitude from day 350 to 352 suggests a crossing
on 351
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10
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11
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12
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- Anomalous Cosmic Rays are thought to be generated when interstellar
neutral atoms are ionized and picked up by the SW, convected to the TS,
and accelerated.
- High-energy ACRs continue to show intensity modulation below 100 MeV,
data taken just after the TS.
- This is puzzling, as the TS ought to have some sort of effect on the
high energy ACRs.
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13
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- Evidence from the LECP instrument seems to point to a TS crossing on
2004/351
- Increased, constant particle intensity, particle anisotropy and varying
SW velocity are all cited as reasons.
- Voyager is moving through the Heliosheath into uncharted territory.
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Notes
