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| Titel |
The Voyagers in the 3-D Heliosheath: Transition in Intensities, Flows, and Velocities |
| VerfasserIn |
S. Krimigis, R. Decker, E. Roelof, M. Hill |
| Konferenz |
EGU General Assembly 2012
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| Medientyp |
Artikel
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| Sprache |
Englisch
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 14 (2012) |
| Datensatznummer |
250059957
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| Zusammenfassung |
| The Voyager 1 (V1) and 2 (V2) spacecraft have been traversing the heliosheath since 2004 (V1) and 2007 (V2), after crossing the termination shock (TS) at distances (latitudes) of 94 AU (34°) and 84 AU (- 29°), respectively. They are currently located at 120 AU (34.5°) and 98 AU (29.5°). The Low Energy Charged Particle (LECP) instrument’s measurements of the intensity spectra and the angular distribution of energetic ions (~ 30 keV 40 keV) at V1 decreased by a factor of 2, suggesting that the spacecraft may be approaching the heliopause. Similar decreases in intensity, however, were also seen a month earlier at V2 some ~ 130 AU away, indicating that there may be a global reordering of heliospheric structure connected with the onset of the new solar cycle. V2 intensities recovered after ~6 months, while more recently, intensities at V1 are increasing again. At V2 the intensities of Anomalous Cosmic Rays (ACR) have now increased for the first time to levels even higher than those seen at V1, and substantially higher than they were at the crossing of the TS. Overall, the outer heliosheath appears to be surprisingly diverse and dynamic, and those variations may well reflect a closer connection to the magnetic configuration of the solar corona than thought possible heretofore. |
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