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Survey of Compressions Observed in the Heliosheath with the Spacecraft Voyager

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Document pages: 24 pages

Abstract: Examples of changes in the magnitude of the B-field after the heliosphere termination shock (TS)with both Voyager spacecraft (SC) are presented. The work focuses onsimilarities and differences in the observations at their in-situ measurements along divergent paths. The presented resultswere collected where the accuracy of the magnetometer is the highest. Theselocations are those wherein, four to seven times during the year, the SCperforms about 330 minutes of slow rotations identified in the SC language asMAGROLs. They are next reviewed, with the understanding that after the TS, atMAGROLs, the solar wind (SW) flows appear to be mostly sub-magnetosonic andcompressional in this region, region named helio-sheath (HS). This is apreliminary survey that uses 48 sec B-fieldaverages. The time-intervals in this work fill gaps in the currently availablestudies for longer time intervals. The present study reinforces the view thatin the HS after the TS the SW is most likely strongly compressional. Further we discuss the fact that observedfluctuation intensity-modes of the B-field in our time-ranges appear tobe much more pronounced at the Voyager 2 path than at the Voyager 1 path.

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